diff --git a/lib/shared/message-utils.js b/lib/shared/message-utils.js
index 7a5060ed6..6eba0eb42 100644
--- a/lib/shared/message-utils.js
+++ b/lib/shared/message-utils.js
@@ -1,760 +1,753 @@
 // @flow
 
 import invariant from 'invariant';
 import _maxBy from 'lodash/fp/maxBy.js';
 import _orderBy from 'lodash/fp/orderBy.js';
 import * as React from 'react';
 
 import { codeBlockRegex, type ParserRules } from './markdown.js';
 import type { CreationSideEffectsFunc } from './messages/message-spec.js';
 import { messageSpecs } from './messages/message-specs.js';
 import { threadIsGroupChat } from './thread-utils.js';
 import { useStringForUser } from '../hooks/ens-cache.js';
 import { extractKeyserverIDFromID } from '../keyserver-conn/keyserver-call-utils.js';
 import { contentStringForMediaArray } from '../media/media-utils.js';
 import type { ChatMessageInfoItem } from '../selectors/chat-selectors.js';
 import { threadInfoSelector } from '../selectors/thread-selectors.js';
 import { userIDsToRelativeUserInfos } from '../selectors/user-selectors.js';
 import { isWebPlatform, type PlatformDetails } from '../types/device-types.js';
 import type { Media } from '../types/media-types.js';
 import { messageTypes } from '../types/message-types-enum.js';
 import {
   type ComposableMessageInfo,
   type MessageData,
   type MessageInfo,
   type MessageStore,
   type MessageTruncationStatus,
   messageTruncationStatus,
   type MultimediaMessageData,
   type RawComposableMessageInfo,
   type RawMessageInfo,
   type RawMultimediaMessageInfo,
   type RobotextMessageInfo,
   type ThreadMessageInfo,
 } from '../types/message-types.js';
 import type {
   EditMessageInfo,
   RawEditMessageInfo,
 } from '../types/messages/edit.js';
 import type { ImagesMessageData } from '../types/messages/images.js';
 import type { MediaMessageData } from '../types/messages/media.js';
 import type {
   RawReactionMessageInfo,
   ReactionMessageInfo,
 } from '../types/messages/reaction.js';
 import type {
   ThreadInfo,
   RawThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
-import type {
-  LegacyRawThreadInfo,
-  LegacyThreadInfo,
-} from '../types/thread-types.js';
+import type { LegacyRawThreadInfo } from '../types/thread-types.js';
 import type { UserInfos } from '../types/user-types.js';
 import {
   type EntityText,
   ET,
   useEntityTextAsString,
 } from '../utils/entity-text.js';
 import { useSelector } from '../utils/redux-utils.js';
 
 const localIDPrefix = 'local';
 
 const defaultMediaMessageOptions = Object.freeze({});
 
 // Prefers localID
 function messageKey(messageInfo: MessageInfo | RawMessageInfo): string {
   if (messageInfo.localID) {
     return messageInfo.localID;
   }
   invariant(messageInfo.id, 'localID should exist if ID does not');
   return messageInfo.id;
 }
 
 // Prefers serverID
 function messageID(messageInfo: MessageInfo | RawMessageInfo): string {
   if (messageInfo.id) {
     return messageInfo.id;
   }
   invariant(messageInfo.localID, 'localID should exist if ID does not');
   return messageInfo.localID;
 }
 
 function robotextForMessageInfo(
   messageInfo: RobotextMessageInfo,
-  threadInfo: ?LegacyThreadInfo | ?ThreadInfo,
-  parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  threadInfo: ?ThreadInfo,
+  parentThreadInfo: ?ThreadInfo,
 ): EntityText {
   const messageSpec = messageSpecs[messageInfo.type];
   invariant(
     messageSpec.robotext,
     `we're not aware of messageType ${messageInfo.type}`,
   );
   return messageSpec.robotext(messageInfo, { threadInfo, parentThreadInfo });
 }
 
 function createMessageInfo(
   rawMessageInfo: RawMessageInfo,
   viewerID: ?string,
   userInfos: UserInfos,
-  threadInfos: { +[id: string]: LegacyThreadInfo | ThreadInfo },
+  threadInfos: { +[id: string]: ThreadInfo },
 ): ?MessageInfo {
   const creatorInfo = userInfos[rawMessageInfo.creatorID];
   const creator = {
     id: rawMessageInfo.creatorID,
     username: creatorInfo ? creatorInfo.username : 'anonymous',
     isViewer: rawMessageInfo.creatorID === viewerID,
   };
 
   const createRelativeUserInfos = (userIDs: $ReadOnlyArray<string>) =>
     userIDsToRelativeUserInfos(userIDs, viewerID, userInfos);
   const createMessageInfoFromRaw = (rawInfo: RawMessageInfo) =>
     createMessageInfo(rawInfo, viewerID, userInfos, threadInfos);
 
   const messageSpec = messageSpecs[rawMessageInfo.type];
 
   return messageSpec.createMessageInfo(rawMessageInfo, creator, {
     threadInfos,
     createMessageInfoFromRaw,
     createRelativeUserInfos,
   });
 }
 
 type LengthResult = {
   +local: number,
   +realized: number,
 };
 function findMessageIDMaxLengths(
   messageIDs: $ReadOnlyArray<?string>,
 ): LengthResult {
   const result = {
     local: 0,
     realized: 0,
   };
   for (const id of messageIDs) {
     if (!id) {
       continue;
     }
     if (id.startsWith(localIDPrefix)) {
       result.local = Math.max(result.local, id.length - localIDPrefix.length);
     } else {
       result.realized = Math.max(result.realized, id.length);
     }
   }
   return result;
 }
 
 function extendMessageID(id: ?string, lengths: LengthResult): ?string {
   if (!id) {
     return id;
   }
   if (id.startsWith(localIDPrefix)) {
     const zeroPaddedID = id
       .substr(localIDPrefix.length)
       .padStart(lengths.local, '0');
     return `${localIDPrefix}${zeroPaddedID}`;
   }
   return id.padStart(lengths.realized, '0');
 }
 
 function sortMessageInfoList<T: MessageInfo | RawMessageInfo>(
   messageInfos: $ReadOnlyArray<T>,
 ): T[] {
   const lengths = findMessageIDMaxLengths(
     messageInfos.map(message => message?.id),
   );
   return _orderBy([
     'time',
     (message: T) => extendMessageID(message?.id, lengths),
   ])(['desc', 'desc'])(messageInfos);
 }
 
 const sortMessageIDs: (messages: {
   +[id: string]: RawMessageInfo,
 }) => (messageIDs: $ReadOnlyArray<string>) => string[] =
   messages => messageIDs => {
     const lengths = findMessageIDMaxLengths(messageIDs);
     return _orderBy([
       (id: string) => messages[id].time,
       (id: string) => extendMessageID(id, lengths),
     ])(['desc', 'desc'])(messageIDs);
   };
 
 function rawMessageInfoFromMessageData(
   messageData: MessageData,
   id: ?string,
 ): RawMessageInfo {
   const messageSpec = messageSpecs[messageData.type];
   invariant(
     messageSpec.rawMessageInfoFromMessageData,
     `we're not aware of messageType ${messageData.type}`,
   );
   return messageSpec.rawMessageInfoFromMessageData(messageData, id);
 }
 
 function mostRecentMessageTimestamp(
   messageInfos: $ReadOnlyArray<RawMessageInfo>,
   previousTimestamp: number,
 ): number {
   if (messageInfos.length === 0) {
     return previousTimestamp;
   }
   return _maxBy('time')(messageInfos).time;
 }
 
 function usersInMessageInfos(
   messageInfos: $ReadOnlyArray<MessageInfo | RawMessageInfo>,
 ): string[] {
   const userIDs = new Set<string>();
   for (const messageInfo of messageInfos) {
     if (messageInfo.creatorID) {
       userIDs.add(messageInfo.creatorID);
     } else if (messageInfo.creator) {
       userIDs.add(messageInfo.creator.id);
     }
   }
   return [...userIDs];
 }
 
 function combineTruncationStatuses(
   first: MessageTruncationStatus,
   second: ?MessageTruncationStatus,
 ): MessageTruncationStatus {
   if (
     first === messageTruncationStatus.EXHAUSTIVE ||
     second === messageTruncationStatus.EXHAUSTIVE
   ) {
     return messageTruncationStatus.EXHAUSTIVE;
   } else if (
     first === messageTruncationStatus.UNCHANGED &&
     second !== null &&
     second !== undefined
   ) {
     return second;
   } else {
     return first;
   }
 }
 
 function shimUnsupportedRawMessageInfos(
   rawMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   platformDetails: ?PlatformDetails,
 ): RawMessageInfo[] {
   if (platformDetails && isWebPlatform(platformDetails.platform)) {
     return [...rawMessageInfos];
   }
   return rawMessageInfos.map(rawMessageInfo => {
     const { shimUnsupportedMessageInfo } = messageSpecs[rawMessageInfo.type];
     if (shimUnsupportedMessageInfo) {
       return shimUnsupportedMessageInfo(rawMessageInfo, platformDetails);
     }
     return rawMessageInfo;
   });
 }
 
 type MediaMessageDataCreationInput = {
   +threadID: string,
   +creatorID: string,
   +media: $ReadOnlyArray<Media>,
   +localID?: ?string,
   +time?: ?number,
   +sidebarCreation?: ?boolean,
   ...
 };
 function createMediaMessageData(
   input: MediaMessageDataCreationInput,
   options: {
     +forceMultimediaMessageType?: boolean,
   } = defaultMediaMessageOptions,
 ): MultimediaMessageData {
   let allMediaArePhotos = true;
   const photoMedia = [];
   for (const singleMedia of input.media) {
     if (singleMedia.type !== 'photo') {
       allMediaArePhotos = false;
       break;
     } else {
       photoMedia.push(singleMedia);
     }
   }
 
   const { localID, threadID, creatorID, sidebarCreation } = input;
   const { forceMultimediaMessageType = false } = options;
   const time = input.time ? input.time : Date.now();
   let messageData;
   if (allMediaArePhotos && !forceMultimediaMessageType) {
     messageData = ({
       type: messageTypes.IMAGES,
       threadID,
       creatorID,
       time,
       media: photoMedia,
     }: ImagesMessageData);
     if (localID) {
       messageData = { ...messageData, localID };
     }
     if (sidebarCreation) {
       messageData = { ...messageData, sidebarCreation };
     }
   } else {
     messageData = ({
       type: messageTypes.MULTIMEDIA,
       threadID,
       creatorID,
       time,
       media: input.media,
     }: MediaMessageData);
     if (localID) {
       messageData = { ...messageData, localID };
     }
     if (sidebarCreation) {
       messageData = { ...messageData, sidebarCreation };
     }
   }
   return messageData;
 }
 
 type MediaMessageInfoCreationInput = {
   ...$Exact<MediaMessageDataCreationInput>,
   +id?: ?string,
 };
 function createMediaMessageInfo(
   input: MediaMessageInfoCreationInput,
   options: {
     +forceMultimediaMessageType?: boolean,
   } = defaultMediaMessageOptions,
 ): RawMultimediaMessageInfo {
   const messageData = createMediaMessageData(input, options);
   const createRawMessageInfo =
     messageSpecs[messageData.type].rawMessageInfoFromMessageData;
   invariant(
     createRawMessageInfo,
     'multimedia message spec should have rawMessageInfoFromMessageData',
   );
   const result = createRawMessageInfo(messageData, input.id);
   invariant(
     result.type === messageTypes.MULTIMEDIA ||
       result.type === messageTypes.IMAGES,
     `media messageSpec returned MessageType ${result.type}`,
   );
   return result;
 }
 
 function stripLocalID(
   rawMessageInfo:
     | RawComposableMessageInfo
     | RawReactionMessageInfo
     | RawEditMessageInfo,
 ) {
   const { localID, ...rest } = rawMessageInfo;
   return rest;
 }
 
 function stripLocalIDs(
   input: $ReadOnlyArray<RawMessageInfo>,
 ): RawMessageInfo[] {
   const output = [];
   for (const rawMessageInfo of input) {
     if (rawMessageInfo.localID) {
       invariant(
         rawMessageInfo.id,
         'serverID should be set if localID is being stripped',
       );
       output.push(stripLocalID(rawMessageInfo));
     } else {
       output.push(rawMessageInfo);
     }
   }
   return output;
 }
 
 // Normally we call trim() to remove whitespace at the beginning and end of each
 // message. However, our Markdown parser supports a "codeBlock" format where the
 // user can indent each line to indicate a code block. If we match the
 // corresponding RegEx, we'll only trim whitespace off the end.
 function trimMessage(message: string): string {
   message = message.replace(/^\n*/, '');
   return codeBlockRegex.exec(message) ? message.trimEnd() : message.trim();
 }
 
 function createMessageQuote(message: string): string {
   // add `>` to each line to include empty lines in the quote
   return message.replace(/^/gm, '> ');
 }
 
 function createMessageReply(message: string): string {
   return createMessageQuote(message) + '\n\n';
 }
 
 function getMostRecentNonLocalMessageID(
   threadID: string,
   messageStore: MessageStore,
 ): ?string {
   const thread = messageStore.threads[threadID];
   return thread?.messageIDs.find(id => !id.startsWith(localIDPrefix));
 }
 
 function getOldestNonLocalMessageID(
   threadID: string,
   messageStore: MessageStore,
 ): ?string {
   const thread = messageStore.threads[threadID];
   if (!thread) {
     return thread;
   }
   const { messageIDs } = thread;
   for (let i = messageIDs.length - 1; i >= 0; i--) {
     const id = messageIDs[i];
     if (!id.startsWith(localIDPrefix)) {
       return id;
     }
   }
   return undefined;
 }
 
 function getMessageTitle(
   messageInfo:
     | ComposableMessageInfo
     | RobotextMessageInfo
     | ReactionMessageInfo
     | EditMessageInfo,
-  threadInfo: LegacyThreadInfo | ThreadInfo,
-  parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  threadInfo: ThreadInfo,
+  parentThreadInfo: ?ThreadInfo,
   markdownRules: ParserRules,
 ): EntityText {
   const { messageTitle } = messageSpecs[messageInfo.type];
   if (messageTitle) {
     return messageTitle({ messageInfo, threadInfo, markdownRules });
   }
 
   invariant(
     messageInfo.type !== messageTypes.TEXT &&
       messageInfo.type !== messageTypes.IMAGES &&
       messageInfo.type !== messageTypes.MULTIMEDIA &&
       messageInfo.type !== messageTypes.REACTION &&
       messageInfo.type !== messageTypes.EDIT_MESSAGE,
     'messageTitle can only be auto-generated for RobotextMessageInfo',
   );
   return robotextForMessageInfo(messageInfo, threadInfo, parentThreadInfo);
 }
 
 function mergeThreadMessageInfos(
   first: ThreadMessageInfo,
   second: ThreadMessageInfo,
   messages: { +[id: string]: RawMessageInfo },
 ): ThreadMessageInfo {
   let firstPointer = 0;
   let secondPointer = 0;
   const mergedMessageIDs = [];
   let firstCandidate = first.messageIDs[firstPointer];
   let secondCandidate = second.messageIDs[secondPointer];
   while (firstCandidate !== undefined || secondCandidate !== undefined) {
     if (firstCandidate === undefined) {
       mergedMessageIDs.push(secondCandidate);
       secondPointer++;
     } else if (secondCandidate === undefined) {
       mergedMessageIDs.push(firstCandidate);
       firstPointer++;
     } else if (firstCandidate === secondCandidate) {
       mergedMessageIDs.push(firstCandidate);
       firstPointer++;
       secondPointer++;
     } else {
       const firstMessage = messages[firstCandidate];
       const secondMessage = messages[secondCandidate];
       invariant(
         firstMessage && secondMessage,
         'message in messageIDs not present in MessageStore',
       );
       if (
         (firstMessage.id &&
           secondMessage.id &&
           firstMessage.id === secondMessage.id) ||
         (firstMessage.localID &&
           secondMessage.localID &&
           firstMessage.localID === secondMessage.localID)
       ) {
         mergedMessageIDs.push(firstCandidate);
         firstPointer++;
         secondPointer++;
       } else if (firstMessage.time < secondMessage.time) {
         mergedMessageIDs.push(secondCandidate);
         secondPointer++;
       } else {
         mergedMessageIDs.push(firstCandidate);
         firstPointer++;
       }
     }
     firstCandidate = first.messageIDs[firstPointer];
     secondCandidate = second.messageIDs[secondPointer];
   }
   return {
     messageIDs: mergedMessageIDs,
     startReached: first.startReached && second.startReached,
   };
 }
 
 type MessagePreviewPart = {
   +text: string,
   // unread has highest contrast, followed by primary, followed by secondary
   +style: 'unread' | 'primary' | 'secondary',
 };
 export type MessagePreviewResult = {
   +message: MessagePreviewPart,
   +username: ?MessagePreviewPart,
 };
 function useMessagePreview(
   originalMessageInfo: ?MessageInfo,
-  threadInfo: LegacyThreadInfo | ThreadInfo,
+  threadInfo: ThreadInfo,
   markdownRules: ParserRules,
 ): ?MessagePreviewResult {
   let messageInfo;
   if (
     originalMessageInfo &&
     originalMessageInfo.type === messageTypes.SIDEBAR_SOURCE
   ) {
     messageInfo = originalMessageInfo.sourceMessage;
   } else {
     messageInfo = originalMessageInfo;
   }
 
   const { parentThreadID } = threadInfo;
   const parentThreadInfo = useSelector(state =>
     parentThreadID ? threadInfoSelector(state)[parentThreadID] : null,
   );
 
   const hasUsername =
     threadIsGroupChat(threadInfo) ||
     threadInfo.name !== '' ||
     messageInfo?.creator.isViewer;
   const shouldDisplayUser =
     messageInfo?.type === messageTypes.TEXT && hasUsername;
 
   const stringForUser = useStringForUser(
     shouldDisplayUser ? messageInfo?.creator : null,
   );
 
   const { unread } = threadInfo.currentUser;
   const username = React.useMemo(() => {
     if (!shouldDisplayUser) {
       return null;
     }
     invariant(
       stringForUser,
       'useStringForUser should only return falsey if pass null or undefined',
     );
     return {
       text: stringForUser,
       style: unread ? 'unread' : 'secondary',
     };
   }, [shouldDisplayUser, stringForUser, unread]);
 
   const messageTitleEntityText = React.useMemo(() => {
     if (!messageInfo) {
       return messageInfo;
     }
     return getMessageTitle(
       messageInfo,
       threadInfo,
       parentThreadInfo,
       markdownRules,
     );
   }, [messageInfo, threadInfo, parentThreadInfo, markdownRules]);
 
   const threadID = threadInfo.id;
   const entityTextToStringParams = React.useMemo(
     () => ({
       threadID,
     }),
     [threadID],
   );
   const messageTitle = useEntityTextAsString(
     messageTitleEntityText,
     entityTextToStringParams,
   );
 
   const isTextMessage = messageInfo?.type === messageTypes.TEXT;
   const message = React.useMemo(() => {
     if (messageTitle === null || messageTitle === undefined) {
       return messageTitle;
     }
 
     let style;
     if (unread) {
       style = 'unread';
     } else if (isTextMessage) {
       style = 'primary';
     } else {
       style = 'secondary';
     }
 
     return { text: messageTitle, style };
   }, [messageTitle, unread, isTextMessage]);
 
   return React.useMemo(() => {
     if (!message) {
       return message;
     }
     return { message, username };
   }, [message, username]);
 }
 
 function useMessageCreationSideEffectsFunc<Info: RawMessageInfo>(
   messageType: $PropertyType<Info, 'type'>,
 ): CreationSideEffectsFunc<Info> {
   const messageSpec = messageSpecs[messageType];
   invariant(messageSpec, `we're not aware of messageType ${messageType}`);
   invariant(
     messageSpec.useCreationSideEffectsFunc,
     `no useCreationSideEffectsFunc in message spec for ${messageType}`,
   );
   return messageSpec.useCreationSideEffectsFunc();
 }
 
 function getPinnedContentFromMessage(targetMessage: RawMessageInfo): string {
   let pinnedContent;
   if (
     targetMessage.type === messageTypes.IMAGES ||
     targetMessage.type === messageTypes.MULTIMEDIA
   ) {
     pinnedContent = contentStringForMediaArray(targetMessage.media);
   } else {
     pinnedContent = 'a message';
   }
 
   return pinnedContent;
 }
 
 function modifyItemForResultScreen(
   item: ChatMessageInfoItem,
 ): ChatMessageInfoItem {
   if (item.messageInfoType === 'composable') {
     return {
       ...item,
       startsConversation: false,
       startsCluster: true,
       endsCluster: true,
       messageInfo: {
         ...item.messageInfo,
         creator: {
           ...item.messageInfo.creator,
           isViewer: false,
         },
       },
     };
   }
   return item;
 }
 
 function constructChangeRoleEntityText(
   affectedUsers: EntityText | string,
   roleName: ?string,
 ): EntityText {
   if (!roleName) {
     return ET`assigned ${affectedUsers} a new role`;
   }
 
   return ET`assigned ${affectedUsers} the "${roleName}" role`;
 }
 
 function useNextLocalID(): string {
   const nextLocalID = useSelector(state => state.nextLocalID);
   return `${localIDPrefix}${nextLocalID}`;
 }
 
 function isInvalidSidebarSource(
   message: RawMessageInfo | MessageInfo,
 ): boolean %checks {
   return (
     (message.type === messageTypes.REACTION ||
       message.type === messageTypes.EDIT_MESSAGE ||
       message.type === messageTypes.SIDEBAR_SOURCE ||
       message.type === messageTypes.TOGGLE_PIN) &&
     !messageSpecs[message.type].canBeSidebarSource
   );
 }
 
 // Prefer checking isInvalidPinSourceForThread below. This function doesn't
 // check whether the user is attempting to pin a SIDEBAR_SOURCE in the context
 // of its parent thread, so it's not suitable for permission checks. We only
 // use it in the message-fetchers.js code where we don't have access to the
 // RawThreadInfo and don't need to do permission checks.
 function isInvalidPinSource(
   messageInfo: RawMessageInfo | MessageInfo,
 ): boolean {
   return !messageSpecs[messageInfo.type].canBePinned;
 }
 
 function isInvalidPinSourceForThread(
   messageInfo: RawMessageInfo | MessageInfo,
-  threadInfo:
-    | LegacyRawThreadInfo
-    | RawThreadInfo
-    | LegacyThreadInfo
-    | ThreadInfo,
+  threadInfo: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
 ): boolean {
   const isValidPinSource = !isInvalidPinSource(messageInfo);
   const isFirstMessageInSidebar = threadInfo.sourceMessageID === messageInfo.id;
   return !isValidPinSource || isFirstMessageInSidebar;
 }
 
 function isUnableToBeRenderedIndependently(
   message: RawMessageInfo | MessageInfo,
 ): boolean {
   return messageSpecs[message.type].canBeRenderedIndependently === false;
 }
 
 function findNewestMessageTimePerKeyserver(
   messageInfos: $ReadOnlyArray<RawMessageInfo>,
 ): { [keyserverID: string]: number } {
   const timePerKeyserver: { [keyserverID: string]: number } = {};
 
   for (const messageInfo of messageInfos) {
     const keyserverID = extractKeyserverIDFromID(messageInfo.threadID);
 
     if (
       !timePerKeyserver[keyserverID] ||
       timePerKeyserver[keyserverID] < messageInfo.time
     ) {
       timePerKeyserver[keyserverID] = messageInfo.time;
     }
   }
 
   return timePerKeyserver;
 }
 
 export {
   localIDPrefix,
   messageKey,
   messageID,
   robotextForMessageInfo,
   createMessageInfo,
   sortMessageInfoList,
   sortMessageIDs,
   rawMessageInfoFromMessageData,
   mostRecentMessageTimestamp,
   usersInMessageInfos,
   combineTruncationStatuses,
   shimUnsupportedRawMessageInfos,
   createMediaMessageData,
   createMediaMessageInfo,
   stripLocalIDs,
   trimMessage,
   createMessageQuote,
   createMessageReply,
   getMostRecentNonLocalMessageID,
   getOldestNonLocalMessageID,
   getMessageTitle,
   mergeThreadMessageInfos,
   useMessagePreview,
   useMessageCreationSideEffectsFunc,
   getPinnedContentFromMessage,
   modifyItemForResultScreen,
   constructChangeRoleEntityText,
   useNextLocalID,
   isInvalidSidebarSource,
   isInvalidPinSource,
   isInvalidPinSourceForThread,
   isUnableToBeRenderedIndependently,
   findNewestMessageTimePerKeyserver,
 };
diff --git a/lib/shared/messages/add-members-message-spec.js b/lib/shared/messages/add-members-message-spec.js
index 0811159be..8ed62fda9 100644
--- a/lib/shared/messages/add-members-message-spec.js
+++ b/lib/shared/messages/add-members-message-spec.js
@@ -1,184 +1,183 @@
 // @flow
 
 import invariant from 'invariant';
 
 import type {
   CreateMessageInfoParams,
   MessageSpec,
   NotificationTextsParams,
 } from './message-spec.js';
 import { joinResult } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type AddMembersMessageData,
   type AddMembersMessageInfo,
   type RawAddMembersMessageInfo,
   rawAddMembersMessageInfoValidator,
 } from '../../types/messages/add-members.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import {
   type EntityText,
   ET,
   pluralizeEntityText,
 } from '../../utils/entity-text.js';
 import { values } from '../../utils/objects.js';
 import { notifRobotextForMessageInfo } from '../notif-utils.js';
 
 type AddMembersMessageSpec = MessageSpec<
   AddMembersMessageData,
   RawAddMembersMessageInfo,
   AddMembersMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: AddMembersMessageData | RawAddMembersMessageInfo,
   ) => string,
   ...
 };
 
 export const addMembersMessageSpec: AddMembersMessageSpec = Object.freeze({
   messageContentForServerDB(
     data: AddMembersMessageData | RawAddMembersMessageInfo,
   ): string {
     return JSON.stringify(data.addedUserIDs);
   },
 
   messageContentForClientDB(data: RawAddMembersMessageInfo): string {
     return addMembersMessageSpec.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromServerDBRow(row: Object): RawAddMembersMessageInfo {
     return {
       type: messageTypes.ADD_MEMBERS,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       addedUserIDs: JSON.parse(row.content),
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawAddMembersMessageInfo {
     const content = clientDBMessageInfo.content;
     invariant(
       content !== undefined && content !== null,
       'content must be defined for AddMembers',
     );
     const rawAddMembersMessageInfo: RawAddMembersMessageInfo = {
       type: messageTypes.ADD_MEMBERS,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       addedUserIDs: JSON.parse(content),
     };
     return rawAddMembersMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawAddMembersMessageInfo,
     creator: RelativeUserInfo,
     params: CreateMessageInfoParams,
   ): AddMembersMessageInfo {
     const addedMembers = params.createRelativeUserInfos(
       rawMessageInfo.addedUserIDs,
     );
     return {
       type: messageTypes.ADD_MEMBERS,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       addedMembers,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: AddMembersMessageData,
     id: ?string,
   ): RawAddMembersMessageInfo {
     invariant(id, 'RawAddMembersMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(messageInfo: AddMembersMessageInfo): EntityText {
     const users = messageInfo.addedMembers;
     invariant(users.length !== 0, 'added who??');
 
     const creator = ET.user({ userInfo: messageInfo.creator });
     const addedUsers = pluralizeEntityText(
       users.map(user => ET`${ET.user({ userInfo: user })}`),
     );
 
     return ET`${creator} added ${addedUsers}`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
     params: NotificationTextsParams,
   ): Promise<NotifTexts> {
     const addedMembersObject: { [string]: RelativeUserInfo } = {};
     for (const messageInfo of messageInfos) {
       invariant(
         messageInfo.type === messageTypes.ADD_MEMBERS,
         'messageInfo should be messageTypes.ADD_MEMBERS!',
       );
       for (const member of messageInfo.addedMembers) {
         addedMembersObject[member.id] = member;
       }
     }
     const addedMembers = values(addedMembersObject);
 
     const mostRecentMessageInfo = messageInfos[0];
     invariant(
       mostRecentMessageInfo.type === messageTypes.ADD_MEMBERS,
       'messageInfo should be messageTypes.ADD_MEMBERS!',
     );
     const mergedMessageInfo = { ...mostRecentMessageInfo, addedMembers };
 
     const { parentThreadInfo } = params;
     const robotext = notifRobotextForMessageInfo(
       mergedMessageInfo,
       threadInfo,
       parentThreadInfo,
     );
     const merged = ET`${robotext} to ${ET.thread({
       display: 'shortName',
       threadInfo,
     })}`;
     return {
       merged,
       title: threadInfo.uiName,
       body: robotext,
     };
   },
 
   notificationCollapseKey(rawMessageInfo: RawAddMembersMessageInfo): string {
     return joinResult(
       rawMessageInfo.type,
       rawMessageInfo.threadID,
       rawMessageInfo.creatorID,
     );
   },
 
   userIDs(rawMessageInfo: RawAddMembersMessageInfo): $ReadOnlyArray<string> {
     return rawMessageInfo.addedUserIDs;
   },
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawAddMembersMessageInfoValidator,
 });
diff --git a/lib/shared/messages/change-role-message-spec.js b/lib/shared/messages/change-role-message-spec.js
index fa0c04209..b18b826e9 100644
--- a/lib/shared/messages/change-role-message-spec.js
+++ b/lib/shared/messages/change-role-message-spec.js
@@ -1,254 +1,253 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   type CreateMessageInfoParams,
   type MessageSpec,
   type NotificationTextsParams,
   pushTypes,
   type RobotextParams,
 } from './message-spec.js';
 import { joinResult } from './utils.js';
 import type { PlatformDetails } from '../../types/device-types.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type ChangeRoleMessageData,
   type ChangeRoleMessageInfo,
   type RawChangeRoleMessageInfo,
   rawChangeRoleMessageInfoValidator,
 } from '../../types/messages/change-role.js';
 import type { RawUnsupportedMessageInfo } from '../../types/messages/unsupported';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import {
   type EntityText,
   entityTextToRawString,
   ET,
   pluralizeEntityText,
 } from '../../utils/entity-text.js';
 import { values } from '../../utils/objects.js';
 import { constructChangeRoleEntityText } from '../message-utils.js';
 import { notifRobotextForMessageInfo } from '../notif-utils.js';
 import { hasMinCodeVersion } from '../version-utils.js';
 
 type ChangeRoleMessageSpec = MessageSpec<
   ChangeRoleMessageData,
   RawChangeRoleMessageInfo,
   ChangeRoleMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: ChangeRoleMessageData | RawChangeRoleMessageInfo,
   ) => string,
   ...
 };
 
 export const changeRoleMessageSpec: ChangeRoleMessageSpec = Object.freeze({
   messageContentForServerDB(
     data: ChangeRoleMessageData | RawChangeRoleMessageInfo,
   ): string {
     return JSON.stringify({
       userIDs: data.userIDs,
       newRole: data.newRole,
       roleName: data.roleName,
     });
   },
 
   messageContentForClientDB(data: RawChangeRoleMessageInfo): string {
     return changeRoleMessageSpec.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromServerDBRow(row: Object): RawChangeRoleMessageInfo {
     const content = JSON.parse(row.content);
     return {
       type: messageTypes.CHANGE_ROLE,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       userIDs: content.userIDs,
       newRole: content.newRole,
       roleName: content.roleName,
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawChangeRoleMessageInfo {
     invariant(
       clientDBMessageInfo.content !== undefined &&
         clientDBMessageInfo.content !== null,
       'content must be defined for ChangeRole',
     );
     const content = JSON.parse(clientDBMessageInfo.content);
     const rawChangeRoleMessageInfo: RawChangeRoleMessageInfo = {
       type: messageTypes.CHANGE_ROLE,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       userIDs: content.userIDs,
       newRole: content.newRole,
       roleName: content.roleName,
     };
     return rawChangeRoleMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawChangeRoleMessageInfo,
     creator: RelativeUserInfo,
     params: CreateMessageInfoParams,
   ): ChangeRoleMessageInfo {
     const members = params.createRelativeUserInfos(rawMessageInfo.userIDs);
     return {
       type: messageTypes.CHANGE_ROLE,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       members,
       newRole: rawMessageInfo.newRole,
       roleName: rawMessageInfo.roleName,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: ChangeRoleMessageData,
     id: ?string,
   ): RawChangeRoleMessageInfo {
     invariant(id, 'RawChangeRoleMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(
     messageInfo: ChangeRoleMessageInfo,
     params: RobotextParams,
   ): EntityText {
     const users = messageInfo.members;
     invariant(users.length !== 0, 'changed whose role??');
 
     const creator = ET.user({ userInfo: messageInfo.creator });
     const affectedUsers = pluralizeEntityText(
       users.map(user => ET`${ET.user({ userInfo: user })}`),
     );
 
     const { threadInfo, parentThreadInfo } = params;
 
     const threadRoleName =
       threadInfo?.roles[messageInfo.newRole]?.name ??
       parentThreadInfo?.roles[messageInfo.newRole]?.name;
     const messageInfoRoleName = messageInfo.roleName;
 
     const roleName = threadRoleName ?? messageInfoRoleName;
 
     const constructedEntityText = constructChangeRoleEntityText(
       affectedUsers,
       roleName,
     );
 
     return ET`${creator} ${constructedEntityText}`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
     params: NotificationTextsParams,
   ): Promise<NotifTexts> {
     const membersObject: { [string]: RelativeUserInfo } = {};
     for (const messageInfo of messageInfos) {
       invariant(
         messageInfo.type === messageTypes.CHANGE_ROLE,
         'messageInfo should be messageTypes.CHANGE_ROLE!',
       );
       for (const member of messageInfo.members) {
         membersObject[member.id] = member;
       }
     }
     const members = values(membersObject);
 
     const mostRecentMessageInfo = messageInfos[0];
     invariant(
       mostRecentMessageInfo.type === messageTypes.CHANGE_ROLE,
       'messageInfo should be messageTypes.CHANGE_ROLE!',
     );
     const mergedMessageInfo = { ...mostRecentMessageInfo, members };
 
     const { parentThreadInfo } = params;
     const robotext = notifRobotextForMessageInfo(
       mergedMessageInfo,
       threadInfo,
       parentThreadInfo,
     );
     const merged = ET`${robotext} of ${ET.thread({
       display: 'shortName',
       threadInfo,
     })}`;
     return {
       merged,
       title: threadInfo.uiName,
       body: robotext,
     };
   },
 
   shimUnsupportedMessageInfo(
     rawMessageInfo: RawChangeRoleMessageInfo,
     platformDetails: ?PlatformDetails,
   ): RawChangeRoleMessageInfo | RawUnsupportedMessageInfo {
     if (hasMinCodeVersion(platformDetails, { native: 251 })) {
       return rawMessageInfo;
     }
 
     const { id, userIDs } = rawMessageInfo;
     invariant(id !== null && id !== undefined, 'id should be set on server');
 
     const affectedUsers = userIDs.length === 1 ? 'a member' : 'some members';
     const roleName = rawMessageInfo.roleName;
 
     const constructedEntityText = constructChangeRoleEntityText(
       affectedUsers,
       roleName,
     );
     const stringifiedEntityText = entityTextToRawString(constructedEntityText);
 
     return {
       type: messageTypes.UNSUPPORTED,
       id,
       threadID: rawMessageInfo.threadID,
       creatorID: rawMessageInfo.creatorID,
       time: rawMessageInfo.time,
       robotext: stringifiedEntityText,
       unsupportedMessageInfo: rawMessageInfo,
     };
   },
 
   unshimMessageInfo(
     unwrapped: RawChangeRoleMessageInfo,
   ): RawChangeRoleMessageInfo {
     return unwrapped;
   },
 
   notificationCollapseKey(rawMessageInfo: RawChangeRoleMessageInfo): string {
     return joinResult(
       rawMessageInfo.type,
       rawMessageInfo.threadID,
       rawMessageInfo.creatorID,
       rawMessageInfo.newRole,
     );
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawChangeRoleMessageInfoValidator,
 });
diff --git a/lib/shared/messages/change-settings-message-spec.js b/lib/shared/messages/change-settings-message-spec.js
index 70ab485ed..403cd0fc5 100644
--- a/lib/shared/messages/change-settings-message-spec.js
+++ b/lib/shared/messages/change-settings-message-spec.js
@@ -1,201 +1,200 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   type MessageSpec,
   type NotificationTextsParams,
   pushTypes,
   type RobotextParams,
 } from './message-spec.js';
 import { joinResult } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type ChangeSettingsMessageData,
   type ChangeSettingsMessageInfo,
   type RawChangeSettingsMessageInfo,
   rawChangeSettingsMessageInfoValidator,
 } from '../../types/messages/change-settings.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
 import { assertThreadType } from '../../types/thread-types-enum.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
 import { validHexColorRegex } from '../account-utils.js';
 import { notifRobotextForMessageInfo } from '../notif-utils.js';
 import { threadLabel } from '../thread-utils.js';
 
 type ChangeSettingsMessageSpec = MessageSpec<
   ChangeSettingsMessageData,
   RawChangeSettingsMessageInfo,
   ChangeSettingsMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: ChangeSettingsMessageData | RawChangeSettingsMessageInfo,
   ) => string,
   ...
 };
 
 export const changeSettingsMessageSpec: ChangeSettingsMessageSpec =
   Object.freeze({
     messageContentForServerDB(
       data: ChangeSettingsMessageData | RawChangeSettingsMessageInfo,
     ): string {
       return JSON.stringify({
         [data.field]: data.value,
       });
     },
 
     messageContentForClientDB(data: RawChangeSettingsMessageInfo): string {
       return changeSettingsMessageSpec.messageContentForServerDB(data);
     },
 
     rawMessageInfoFromServerDBRow(row: Object): RawChangeSettingsMessageInfo {
       const content = JSON.parse(row.content);
       const field = Object.keys(content)[0];
       return {
         type: messageTypes.CHANGE_SETTINGS,
         id: row.id.toString(),
         threadID: row.threadID.toString(),
         time: row.time,
         creatorID: row.creatorID.toString(),
         field,
         value: content[field],
       };
     },
 
     rawMessageInfoFromClientDB(
       clientDBMessageInfo: ClientDBMessageInfo,
     ): RawChangeSettingsMessageInfo {
       invariant(
         clientDBMessageInfo.content !== undefined &&
           clientDBMessageInfo.content !== null,
         'content must be defined for ChangeSettings',
       );
       const content = JSON.parse(clientDBMessageInfo.content);
       const field = Object.keys(content)[0];
       const rawChangeSettingsMessageInfo: RawChangeSettingsMessageInfo = {
         type: messageTypes.CHANGE_SETTINGS,
         id: clientDBMessageInfo.id,
         threadID: clientDBMessageInfo.thread,
         time: parseInt(clientDBMessageInfo.time),
         creatorID: clientDBMessageInfo.user,
         field,
         value: content[field],
       };
       return rawChangeSettingsMessageInfo;
     },
 
     createMessageInfo(
       rawMessageInfo: RawChangeSettingsMessageInfo,
       creator: RelativeUserInfo,
     ): ChangeSettingsMessageInfo {
       return {
         type: messageTypes.CHANGE_SETTINGS,
         id: rawMessageInfo.id,
         threadID: rawMessageInfo.threadID,
         creator,
         time: rawMessageInfo.time,
         field: rawMessageInfo.field,
         value: rawMessageInfo.value,
       };
     },
 
     rawMessageInfoFromMessageData(
       messageData: ChangeSettingsMessageData,
       id: ?string,
     ): RawChangeSettingsMessageInfo {
       invariant(id, 'RawChangeSettingsMessageInfo needs id');
       return { ...messageData, id };
     },
 
     robotext(
       messageInfo: ChangeSettingsMessageInfo,
       params: RobotextParams,
     ): EntityText {
       const creator = ET.user({ userInfo: messageInfo.creator });
       const thread = ET.thread({
         display: 'alwaysDisplayShortName',
         threadID: messageInfo.threadID,
         threadType: params.threadInfo?.type,
         parentThreadID: params.threadInfo?.parentThreadID,
         possessive: true,
       });
       if (
         (messageInfo.field === 'name' || messageInfo.field === 'description') &&
         messageInfo.value.toString() === ''
       ) {
         return ET`${creator} cleared ${thread} ${messageInfo.field}`;
       }
       if (messageInfo.field === 'avatar') {
         return ET`${creator} updated ${thread} ${messageInfo.field}`;
       }
 
       let value;
       if (
         messageInfo.field === 'color' &&
         messageInfo.value.toString().match(validHexColorRegex)
       ) {
         value = ET.color({ hex: `#${messageInfo.value}` });
       } else if (messageInfo.field === 'type') {
         invariant(
           typeof messageInfo.value === 'number',
           'messageInfo.value should be number for thread type change ',
         );
         const newThreadType = assertThreadType(messageInfo.value);
         value = threadLabel(newThreadType);
       } else {
         value = messageInfo.value.toString();
       }
       return ET`${creator} updated ${thread} ${messageInfo.field} to "${value}"`;
     },
 
     async notificationTexts(
       messageInfos: $ReadOnlyArray<MessageInfo>,
-      threadInfo: LegacyThreadInfo | ThreadInfo,
+      threadInfo: ThreadInfo,
       params: NotificationTextsParams,
     ): Promise<NotifTexts> {
       const mostRecentMessageInfo = messageInfos[0];
       invariant(
         mostRecentMessageInfo.type === messageTypes.CHANGE_SETTINGS,
         'messageInfo should be messageTypes.CHANGE_SETTINGS!',
       );
       const { parentThreadInfo } = params;
       const body = notifRobotextForMessageInfo(
         mostRecentMessageInfo,
         threadInfo,
         parentThreadInfo,
       );
       return {
         merged: body,
         title: threadInfo.uiName,
         body,
       };
     },
 
     notificationCollapseKey(
       rawMessageInfo: RawChangeSettingsMessageInfo,
     ): string {
       return joinResult(
         rawMessageInfo.type,
         rawMessageInfo.threadID,
         rawMessageInfo.creatorID,
         rawMessageInfo.field,
       );
     },
 
     generatesNotifs: async () => pushTypes.NOTIF,
 
     canBeSidebarSource: true,
 
     canBePinned: false,
 
     validator: rawChangeSettingsMessageInfoValidator,
   });
diff --git a/lib/shared/messages/create-entry-message-spec.js b/lib/shared/messages/create-entry-message-spec.js
index f9a6ebd2f..7d0661a32 100644
--- a/lib/shared/messages/create-entry-message-spec.js
+++ b/lib/shared/messages/create-entry-message-spec.js
@@ -1,139 +1,138 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { type MessageSpec, pushTypes } from './message-spec.js';
 import { joinResult } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type CreateEntryMessageData,
   type CreateEntryMessageInfo,
   type RawCreateEntryMessageInfo,
   rawCreateEntryMessageInfoValidator,
 } from '../../types/messages/create-entry.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { prettyDate } from '../../utils/date-utils.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
 import { notifTextsForEntryCreationOrEdit } from '../notif-utils.js';
 
 type CreateEntryMessageSpec = MessageSpec<
   CreateEntryMessageData,
   RawCreateEntryMessageInfo,
   CreateEntryMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: CreateEntryMessageData | RawCreateEntryMessageInfo,
   ) => string,
   ...
 };
 
 export const createEntryMessageSpec: CreateEntryMessageSpec = Object.freeze({
   messageContentForServerDB(
     data: CreateEntryMessageData | RawCreateEntryMessageInfo,
   ): string {
     return JSON.stringify({
       entryID: data.entryID,
       date: data.date,
       text: data.text,
     });
   },
 
   messageContentForClientDB(data: RawCreateEntryMessageInfo): string {
     return createEntryMessageSpec.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromServerDBRow(row: Object): RawCreateEntryMessageInfo {
     const content = JSON.parse(row.content);
     return {
       type: messageTypes.CREATE_ENTRY,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       entryID: content.entryID,
       date: content.date,
       text: content.text,
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawCreateEntryMessageInfo {
     invariant(
       clientDBMessageInfo.content !== undefined &&
         clientDBMessageInfo.content !== null,
       'content must be defined for CreateEntry',
     );
     const content = JSON.parse(clientDBMessageInfo.content);
     const rawCreateEntryMessageInfo: RawCreateEntryMessageInfo = {
       type: messageTypes.CREATE_ENTRY,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       entryID: content.entryID,
       date: content.date,
       text: content.text,
     };
     return rawCreateEntryMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawCreateEntryMessageInfo,
     creator: RelativeUserInfo,
   ): CreateEntryMessageInfo {
     return {
       type: messageTypes.CREATE_ENTRY,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       entryID: rawMessageInfo.entryID,
       date: rawMessageInfo.date,
       text: rawMessageInfo.text,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: CreateEntryMessageData,
     id: ?string,
   ): RawCreateEntryMessageInfo {
     invariant(id, 'RawCreateEntryMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(messageInfo: CreateEntryMessageInfo): EntityText {
     const date = prettyDate(messageInfo.date);
     const creator = ET.user({ userInfo: messageInfo.creator });
     const { text } = messageInfo;
     return ET`${creator} created an event scheduled for ${date}: "${text}"`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     return notifTextsForEntryCreationOrEdit(messageInfos, threadInfo);
   },
 
   notificationCollapseKey(rawMessageInfo: RawCreateEntryMessageInfo): string {
     return joinResult(rawMessageInfo.creatorID, rawMessageInfo.entryID);
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawCreateEntryMessageInfoValidator,
 });
diff --git a/lib/shared/messages/create-sidebar-message-spec.js b/lib/shared/messages/create-sidebar-message-spec.js
index acf47141c..797fd4845 100644
--- a/lib/shared/messages/create-sidebar-message-spec.js
+++ b/lib/shared/messages/create-sidebar-message-spec.js
@@ -1,230 +1,229 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   type CreateMessageInfoParams,
   type MessageSpec,
   type NotificationTextsParams,
   pushTypes,
   type RobotextParams,
 } from './message-spec.js';
 import { joinResult } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type CreateSidebarMessageData,
   type CreateSidebarMessageInfo,
   type RawCreateSidebarMessageInfo,
   rawCreateSidebarMessageInfoValidator,
 } from '../../types/messages/create-sidebar.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import {
   type EntityText,
   ET,
   pluralizeEntityText,
 } from '../../utils/entity-text.js';
 import { notifTextsForSidebarCreation } from '../notif-utils.js';
 
 type CreateSidebarMessageSpec = MessageSpec<
   CreateSidebarMessageData,
   RawCreateSidebarMessageInfo,
   CreateSidebarMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: CreateSidebarMessageData | RawCreateSidebarMessageInfo,
   ) => string,
   ...
 };
 
 export const createSidebarMessageSpec: CreateSidebarMessageSpec = Object.freeze(
   {
     messageContentForServerDB(
       data: CreateSidebarMessageData | RawCreateSidebarMessageInfo,
     ): string {
       return JSON.stringify({
         ...data.initialThreadState,
         sourceMessageAuthorID: data.sourceMessageAuthorID,
       });
     },
 
     messageContentForClientDB(data: RawCreateSidebarMessageInfo): string {
       return createSidebarMessageSpec.messageContentForServerDB(data);
     },
 
     rawMessageInfoFromServerDBRow(row: Object): RawCreateSidebarMessageInfo {
       const { sourceMessageAuthorID, ...initialThreadState } = JSON.parse(
         row.content,
       );
       return {
         type: messageTypes.CREATE_SIDEBAR,
         id: row.id.toString(),
         threadID: row.threadID.toString(),
         time: row.time,
         creatorID: row.creatorID.toString(),
         sourceMessageAuthorID,
         initialThreadState,
       };
     },
 
     rawMessageInfoFromClientDB(
       clientDBMessageInfo: ClientDBMessageInfo,
     ): RawCreateSidebarMessageInfo {
       invariant(
         clientDBMessageInfo.content !== undefined &&
           clientDBMessageInfo.content !== null,
         'content must be defined for CreateSidebar',
       );
 
       const { sourceMessageAuthorID, ...initialThreadState } = JSON.parse(
         clientDBMessageInfo.content,
       );
       const rawCreateSidebarMessageInfo: RawCreateSidebarMessageInfo = {
         type: messageTypes.CREATE_SIDEBAR,
         id: clientDBMessageInfo.id,
         threadID: clientDBMessageInfo.thread,
         time: parseInt(clientDBMessageInfo.time),
         creatorID: clientDBMessageInfo.user,
         sourceMessageAuthorID: sourceMessageAuthorID,
         initialThreadState: initialThreadState,
       };
       return rawCreateSidebarMessageInfo;
     },
 
     createMessageInfo(
       rawMessageInfo: RawCreateSidebarMessageInfo,
       creator: RelativeUserInfo,
       params: CreateMessageInfoParams,
     ): ?CreateSidebarMessageInfo {
       const { threadInfos } = params;
       const parentThreadInfo =
         threadInfos[rawMessageInfo.initialThreadState.parentThreadID];
 
       const sourceMessageAuthor = params.createRelativeUserInfos([
         rawMessageInfo.sourceMessageAuthorID,
       ])[0];
       if (!sourceMessageAuthor) {
         return null;
       }
 
       return {
         type: messageTypes.CREATE_SIDEBAR,
         id: rawMessageInfo.id,
         threadID: rawMessageInfo.threadID,
         creator,
         time: rawMessageInfo.time,
         sourceMessageAuthor,
         initialThreadState: {
           name: rawMessageInfo.initialThreadState.name,
           parentThreadInfo,
           color: rawMessageInfo.initialThreadState.color,
           otherMembers: params.createRelativeUserInfos(
             rawMessageInfo.initialThreadState.memberIDs.filter(
               (userID: string) => userID !== rawMessageInfo.creatorID,
             ),
           ),
         },
       };
     },
 
     rawMessageInfoFromMessageData(
       messageData: CreateSidebarMessageData,
       id: ?string,
     ): RawCreateSidebarMessageInfo {
       invariant(id, 'RawCreateSidebarMessageInfo needs id');
       return { ...messageData, id };
     },
 
     robotext(
       messageInfo: CreateSidebarMessageInfo,
       params: RobotextParams,
     ): EntityText {
       let text = ET`started ${ET.thread({
         display: 'alwaysDisplayShortName',
         threadID: messageInfo.threadID,
         threadType: params.threadInfo?.type,
         parentThreadID: params.threadInfo?.parentThreadID,
       })}`;
       const users = messageInfo.initialThreadState.otherMembers.filter(
         member => member.id !== messageInfo.sourceMessageAuthor.id,
       );
       if (users.length !== 0) {
         const initialUsers = pluralizeEntityText(
           users.map(user => ET`${ET.user({ userInfo: user })}`),
         );
         text = ET`${text} and added ${initialUsers}`;
       }
       const creator = ET.user({ userInfo: messageInfo.creator });
       return ET`${creator} ${text}`;
     },
 
     unshimMessageInfo(
       unwrapped: RawCreateSidebarMessageInfo,
     ): RawCreateSidebarMessageInfo {
       return unwrapped;
     },
 
     async notificationTexts(
       messageInfos: $ReadOnlyArray<MessageInfo>,
-      threadInfo: LegacyThreadInfo | ThreadInfo,
+      threadInfo: ThreadInfo,
       params: NotificationTextsParams,
     ): Promise<NotifTexts> {
       const createSidebarMessageInfo = messageInfos[0];
       invariant(
         createSidebarMessageInfo.type === messageTypes.CREATE_SIDEBAR,
         'first MessageInfo should be messageTypes.CREATE_SIDEBAR!',
       );
 
       let sidebarSourceMessageInfo;
       const secondMessageInfo = messageInfos[1];
       if (
         secondMessageInfo &&
         secondMessageInfo.type === messageTypes.SIDEBAR_SOURCE
       ) {
         sidebarSourceMessageInfo = secondMessageInfo;
       }
 
       return notifTextsForSidebarCreation({
         createSidebarMessageInfo,
         sidebarSourceMessageInfo,
         threadInfo,
         params,
       });
     },
 
     notificationCollapseKey(
       rawMessageInfo: RawCreateSidebarMessageInfo,
     ): string {
       return joinResult(messageTypes.CREATE_SIDEBAR, rawMessageInfo.threadID);
     },
 
     generatesNotifs: async () => pushTypes.NOTIF,
 
     userIDs(
       rawMessageInfo: RawCreateSidebarMessageInfo,
     ): $ReadOnlyArray<string> {
       return rawMessageInfo.initialThreadState.memberIDs;
     },
 
     threadIDs(
       rawMessageInfo: RawCreateSidebarMessageInfo,
     ): $ReadOnlyArray<string> {
       const { parentThreadID } = rawMessageInfo.initialThreadState;
       return [parentThreadID];
     },
 
     canBeSidebarSource: true,
 
     canBePinned: false,
 
     validator: rawCreateSidebarMessageInfoValidator,
   },
 );
diff --git a/lib/shared/messages/create-sub-thread-message-spec.js b/lib/shared/messages/create-sub-thread-message-spec.js
index 518349f27..db7b591fd 100644
--- a/lib/shared/messages/create-sub-thread-message-spec.js
+++ b/lib/shared/messages/create-sub-thread-message-spec.js
@@ -1,182 +1,181 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   type CreateMessageInfoParams,
   type GeneratesNotifsParams,
   type MessageSpec,
   pushTypes,
 } from './message-spec.js';
 import { assertSingleMessageInfo } from './utils.js';
 import { permissionLookup } from '../../permissions/thread-permissions.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type CreateSubthreadMessageData,
   type CreateSubthreadMessageInfo,
   type RawCreateSubthreadMessageInfo,
   rawCreateSubthreadMessageInfoValidator,
 } from '../../types/messages/create-subthread.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
 import { threadPermissions } from '../../types/thread-permission-types.js';
 import { threadTypes } from '../../types/thread-types-enum.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
 import { notifTextsForSubthreadCreation } from '../notif-utils.js';
 
 type CreateSubThreadMessageSpec = MessageSpec<
   CreateSubthreadMessageData,
   RawCreateSubthreadMessageInfo,
   CreateSubthreadMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: CreateSubthreadMessageData | RawCreateSubthreadMessageInfo,
   ) => string,
   ...
 };
 
 export const createSubThreadMessageSpec: CreateSubThreadMessageSpec =
   Object.freeze({
     messageContentForServerDB(
       data: CreateSubthreadMessageData | RawCreateSubthreadMessageInfo,
     ): string {
       return data.childThreadID;
     },
 
     messageContentForClientDB(data: RawCreateSubthreadMessageInfo): string {
       return createSubThreadMessageSpec.messageContentForServerDB(data);
     },
 
     rawMessageInfoFromServerDBRow(row: Object): ?RawCreateSubthreadMessageInfo {
       const subthreadPermissions = row.subthread_permissions;
       if (!permissionLookup(subthreadPermissions, threadPermissions.KNOW_OF)) {
         return null;
       }
       return {
         type: messageTypes.CREATE_SUB_THREAD,
         id: row.id.toString(),
         threadID: row.threadID.toString(),
         time: row.time,
         creatorID: row.creatorID.toString(),
         childThreadID: row.content,
       };
     },
 
     rawMessageInfoFromClientDB(
       clientDBMessageInfo: ClientDBMessageInfo,
     ): RawCreateSubthreadMessageInfo {
       const content = clientDBMessageInfo.content;
       invariant(
         content !== undefined && content !== null,
         'content must be defined for CreateSubThread',
       );
       const rawCreateSubthreadMessageInfo: RawCreateSubthreadMessageInfo = {
         type: messageTypes.CREATE_SUB_THREAD,
         id: clientDBMessageInfo.id,
         threadID: clientDBMessageInfo.thread,
         time: parseInt(clientDBMessageInfo.time),
         creatorID: clientDBMessageInfo.user,
         childThreadID: content,
       };
       return rawCreateSubthreadMessageInfo;
     },
 
     createMessageInfo(
       rawMessageInfo: RawCreateSubthreadMessageInfo,
       creator: RelativeUserInfo,
       params: CreateMessageInfoParams,
     ): ?CreateSubthreadMessageInfo {
       const { threadInfos } = params;
       const childThreadInfo = threadInfos[rawMessageInfo.childThreadID];
       if (!childThreadInfo) {
         return null;
       }
       return {
         type: messageTypes.CREATE_SUB_THREAD,
         id: rawMessageInfo.id,
         threadID: rawMessageInfo.threadID,
         creator,
         time: rawMessageInfo.time,
         childThreadInfo,
       };
     },
 
     rawMessageInfoFromMessageData(
       messageData: CreateSubthreadMessageData,
       id: ?string,
     ): RawCreateSubthreadMessageInfo {
       invariant(id, 'RawCreateSubthreadMessageInfo needs id');
       return { ...messageData, id };
     },
 
     robotext(messageInfo: CreateSubthreadMessageInfo): EntityText {
       const threadEntity = ET.thread({
         display: 'shortName',
         threadInfo: messageInfo.childThreadInfo,
         subchannel: true,
       });
 
       let text;
       if (messageInfo.childThreadInfo.name) {
         const childNoun =
           messageInfo.childThreadInfo.type === threadTypes.SIDEBAR
             ? 'thread'
             : 'subchannel';
         text = ET`created a ${childNoun} named "${threadEntity}"`;
       } else {
         text = ET`created a ${threadEntity}`;
       }
 
       const creator = ET.user({ userInfo: messageInfo.creator });
       return ET`${creator} ${text}`;
     },
 
     async notificationTexts(
       messageInfos: $ReadOnlyArray<MessageInfo>,
-      threadInfo: LegacyThreadInfo | ThreadInfo,
+      threadInfo: ThreadInfo,
     ): Promise<NotifTexts> {
       const messageInfo = assertSingleMessageInfo(messageInfos);
       invariant(
         messageInfo.type === messageTypes.CREATE_SUB_THREAD,
         'messageInfo should be messageTypes.CREATE_SUB_THREAD!',
       );
       return notifTextsForSubthreadCreation({
         creator: messageInfo.creator,
         threadType: messageInfo.childThreadInfo.type,
         parentThreadInfo: threadInfo,
         childThreadName: messageInfo.childThreadInfo.name,
         childThreadUIName: messageInfo.childThreadInfo.uiName,
       });
     },
 
     generatesNotifs: async (
       rawMessageInfo: RawCreateSubthreadMessageInfo,
       messageData: CreateSubthreadMessageData,
       params: GeneratesNotifsParams,
     ) => {
       const { userNotMemberOfSubthreads } = params;
       return userNotMemberOfSubthreads.has(rawMessageInfo.childThreadID)
         ? pushTypes.NOTIF
         : undefined;
     },
 
     threadIDs(
       rawMessageInfo: RawCreateSubthreadMessageInfo,
     ): $ReadOnlyArray<string> {
       return [rawMessageInfo.childThreadID];
     },
 
     canBeSidebarSource: true,
 
     canBePinned: false,
 
     validator: rawCreateSubthreadMessageInfoValidator,
   });
diff --git a/lib/shared/messages/create-thread-message-spec.js b/lib/shared/messages/create-thread-message-spec.js
index 95a441f35..d6a6451e9 100644
--- a/lib/shared/messages/create-thread-message-spec.js
+++ b/lib/shared/messages/create-thread-message-spec.js
@@ -1,220 +1,219 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   type CreateMessageInfoParams,
   type MessageSpec,
   pushTypes,
   type RobotextParams,
 } from './message-spec.js';
 import { assertSingleMessageInfo } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type CreateThreadMessageData,
   type CreateThreadMessageInfo,
   type RawCreateThreadMessageInfo,
   rawCreateThreadMessageInfoValidator,
 } from '../../types/messages/create-thread.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import {
   type EntityText,
   ET,
   pluralizeEntityText,
 } from '../../utils/entity-text.js';
 import { notifTextsForSubthreadCreation } from '../notif-utils.js';
 import { threadNoun } from '../thread-utils.js';
 
 type CreateThreadMessageSpec = MessageSpec<
   CreateThreadMessageData,
   RawCreateThreadMessageInfo,
   CreateThreadMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: CreateThreadMessageData | RawCreateThreadMessageInfo,
   ) => string,
   ...
 };
 
 export const createThreadMessageSpec: CreateThreadMessageSpec = Object.freeze({
   messageContentForServerDB(
     data: CreateThreadMessageData | RawCreateThreadMessageInfo,
   ): string {
     return JSON.stringify(data.initialThreadState);
   },
 
   messageContentForClientDB(data: RawCreateThreadMessageInfo): string {
     return createThreadMessageSpec.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromServerDBRow(row: Object): RawCreateThreadMessageInfo {
     return {
       type: messageTypes.CREATE_THREAD,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       initialThreadState: JSON.parse(row.content),
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawCreateThreadMessageInfo {
     const content = clientDBMessageInfo.content;
     invariant(
       content !== undefined && content !== null,
       'content must be defined for CreateThread',
     );
     const rawCreateThreadMessageInfo: RawCreateThreadMessageInfo = {
       type: messageTypes.CREATE_THREAD,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       initialThreadState: JSON.parse(content),
     };
     return rawCreateThreadMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawCreateThreadMessageInfo,
     creator: RelativeUserInfo,
     params: CreateMessageInfoParams,
   ): CreateThreadMessageInfo {
     const initialParentThreadID =
       rawMessageInfo.initialThreadState.parentThreadID;
     const parentThreadInfo = initialParentThreadID
       ? params.threadInfos[initialParentThreadID]
       : null;
 
     return {
       type: messageTypes.CREATE_THREAD,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       initialThreadState: {
         name: rawMessageInfo.initialThreadState.name,
         parentThreadInfo,
         type: rawMessageInfo.initialThreadState.type,
         color: rawMessageInfo.initialThreadState.color,
         otherMembers: params.createRelativeUserInfos(
           rawMessageInfo.initialThreadState.memberIDs.filter(
             (userID: string) => userID !== rawMessageInfo.creatorID,
           ),
         ),
       },
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: CreateThreadMessageData,
     id: ?string,
   ): RawCreateThreadMessageInfo {
     invariant(id, 'RawCreateThreadMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(
     messageInfo: CreateThreadMessageInfo,
     params: RobotextParams,
   ): EntityText {
     let text = ET`created ${ET.thread({
       display: 'alwaysDisplayShortName',
       threadID: messageInfo.threadID,
       threadType: params.threadInfo?.type,
       parentThreadID: params.threadInfo?.parentThreadID,
     })}`;
     const parentThread = messageInfo.initialThreadState.parentThreadInfo;
     if (parentThread) {
       text = ET`${text} as a child of ${ET.thread({
         display: 'uiName',
         threadInfo: parentThread,
       })}`;
     }
     if (messageInfo.initialThreadState.name) {
       text = ET`${text} with the name "${messageInfo.initialThreadState.name}"`;
     }
     const users = messageInfo.initialThreadState.otherMembers;
     if (users.length !== 0) {
       const initialUsers = pluralizeEntityText(
         users.map(user => ET`${ET.user({ userInfo: user })}`),
       );
       text = ET`${text} and added ${initialUsers}`;
     }
     const creator = ET.user({ userInfo: messageInfo.creator });
     return ET`${creator} ${text}`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const messageInfo = assertSingleMessageInfo(messageInfos);
     invariant(
       messageInfo.type === messageTypes.CREATE_THREAD,
       'messageInfo should be messageTypes.CREATE_THREAD!',
     );
 
     const threadType = messageInfo.initialThreadState.type;
     const parentThreadInfo = messageInfo.initialThreadState.parentThreadInfo;
     const threadName = messageInfo.initialThreadState.name;
 
     if (parentThreadInfo) {
       return notifTextsForSubthreadCreation({
         creator: messageInfo.creator,
         threadType,
         parentThreadInfo,
         childThreadName: threadName,
         childThreadUIName: threadInfo.uiName,
       });
     }
 
     const creator = ET.user({ userInfo: messageInfo.creator });
     const prefix = ET`${creator}`;
 
     const body = `created a new ${threadNoun(threadType)}`;
     let merged = ET`${prefix} ${body}`;
     if (threadName) {
       merged = ET`${merged} called "${threadName}"`;
     }
 
     return {
       merged,
       body,
       title: threadInfo.uiName,
       prefix,
     };
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   userIDs(rawMessageInfo: RawCreateThreadMessageInfo): $ReadOnlyArray<string> {
     return rawMessageInfo.initialThreadState.memberIDs;
   },
 
   startsThread: true,
 
   threadIDs(
     rawMessageInfo: RawCreateThreadMessageInfo,
   ): $ReadOnlyArray<string> {
     const { parentThreadID } = rawMessageInfo.initialThreadState;
     return parentThreadID ? [parentThreadID] : [];
   },
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawCreateThreadMessageInfoValidator,
 });
diff --git a/lib/shared/messages/delete-entry-message-spec.js b/lib/shared/messages/delete-entry-message-spec.js
index 1474d170c..a4f57d2aa 100644
--- a/lib/shared/messages/delete-entry-message-spec.js
+++ b/lib/shared/messages/delete-entry-message-spec.js
@@ -1,154 +1,153 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { type MessageSpec, pushTypes } from './message-spec.js';
 import { assertSingleMessageInfo } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type DeleteEntryMessageData,
   type DeleteEntryMessageInfo,
   type RawDeleteEntryMessageInfo,
   rawDeleteEntryMessageInfoValidator,
 } from '../../types/messages/delete-entry.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { prettyDate } from '../../utils/date-utils.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
 
 type DeleteEntryMessageSpec = MessageSpec<
   DeleteEntryMessageData,
   RawDeleteEntryMessageInfo,
   DeleteEntryMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: DeleteEntryMessageData | RawDeleteEntryMessageInfo,
   ) => string,
   ...
 };
 
 export const deleteEntryMessageSpec: DeleteEntryMessageSpec = Object.freeze({
   messageContentForServerDB(
     data: DeleteEntryMessageData | RawDeleteEntryMessageInfo,
   ): string {
     return JSON.stringify({
       entryID: data.entryID,
       date: data.date,
       text: data.text,
     });
   },
 
   messageContentForClientDB(data: RawDeleteEntryMessageInfo): string {
     return deleteEntryMessageSpec.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromServerDBRow(row: Object): RawDeleteEntryMessageInfo {
     const content = JSON.parse(row.content);
     return {
       type: messageTypes.DELETE_ENTRY,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       entryID: content.entryID,
       date: content.date,
       text: content.text,
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawDeleteEntryMessageInfo {
     invariant(
       clientDBMessageInfo.content !== undefined &&
         clientDBMessageInfo.content !== null,
       'content must be defined for DeleteEntry',
     );
     const content = JSON.parse(clientDBMessageInfo.content);
     const rawDeleteEntryMessageInfo: RawDeleteEntryMessageInfo = {
       type: messageTypes.DELETE_ENTRY,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       entryID: content.entryID,
       date: content.date,
       text: content.text,
     };
     return rawDeleteEntryMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawDeleteEntryMessageInfo,
     creator: RelativeUserInfo,
   ): DeleteEntryMessageInfo {
     return {
       type: messageTypes.DELETE_ENTRY,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       entryID: rawMessageInfo.entryID,
       date: rawMessageInfo.date,
       text: rawMessageInfo.text,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: DeleteEntryMessageData,
     id: ?string,
   ): RawDeleteEntryMessageInfo {
     invariant(id, 'RawDeleteEntryMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(messageInfo: DeleteEntryMessageInfo): EntityText {
     const date = prettyDate(messageInfo.date);
     const creator = ET.user({ userInfo: messageInfo.creator });
     const { text } = messageInfo;
     return ET`${creator} deleted an event scheduled for ${date}: "${text}"`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const messageInfo = assertSingleMessageInfo(messageInfos);
     invariant(
       messageInfo.type === messageTypes.DELETE_ENTRY,
       'messageInfo should be messageTypes.DELETE_ENTRY!',
     );
 
     const thread = ET.thread({ display: 'shortName', threadInfo });
     const creator = ET.user({ userInfo: messageInfo.creator });
     const date = prettyDate(messageInfo.date);
 
     const prefix = ET`${creator}`;
     let body = ET`deleted an event in ${thread}`;
     body = ET`${body} scheduled for ${date}: "${messageInfo.text}"`;
     const merged = ET`${prefix} ${body}`;
 
     return {
       merged,
       title: threadInfo.uiName,
       body,
       prefix,
     };
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawDeleteEntryMessageInfoValidator,
 });
diff --git a/lib/shared/messages/edit-entry-message-spec.js b/lib/shared/messages/edit-entry-message-spec.js
index 20ea279db..222ee9bc4 100644
--- a/lib/shared/messages/edit-entry-message-spec.js
+++ b/lib/shared/messages/edit-entry-message-spec.js
@@ -1,139 +1,138 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { type MessageSpec, pushTypes } from './message-spec.js';
 import { joinResult } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type EditEntryMessageData,
   type EditEntryMessageInfo,
   type RawEditEntryMessageInfo,
   rawEditEntryMessageInfoValidator,
 } from '../../types/messages/edit-entry.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { prettyDate } from '../../utils/date-utils.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
 import { notifTextsForEntryCreationOrEdit } from '../notif-utils.js';
 
 type EditEntryMessageSpec = MessageSpec<
   EditEntryMessageData,
   RawEditEntryMessageInfo,
   EditEntryMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: EditEntryMessageData | RawEditEntryMessageInfo,
   ) => string,
   ...
 };
 
 export const editEntryMessageSpec: EditEntryMessageSpec = Object.freeze({
   messageContentForServerDB(
     data: EditEntryMessageData | RawEditEntryMessageInfo,
   ): string {
     return JSON.stringify({
       entryID: data.entryID,
       date: data.date,
       text: data.text,
     });
   },
 
   messageContentForClientDB(data: RawEditEntryMessageInfo): string {
     return editEntryMessageSpec.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromServerDBRow(row: Object): RawEditEntryMessageInfo {
     const content = JSON.parse(row.content);
     return {
       type: messageTypes.EDIT_ENTRY,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       entryID: content.entryID,
       date: content.date,
       text: content.text,
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawEditEntryMessageInfo {
     invariant(
       clientDBMessageInfo.content !== null &&
         clientDBMessageInfo.content !== undefined,
       'content must be defined for EditEntry',
     );
     const content = JSON.parse(clientDBMessageInfo.content);
     const rawEditEntryMessageInfo: RawEditEntryMessageInfo = {
       type: messageTypes.EDIT_ENTRY,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       entryID: content.entryID,
       date: content.date,
       text: content.text,
     };
     return rawEditEntryMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawEditEntryMessageInfo,
     creator: RelativeUserInfo,
   ): EditEntryMessageInfo {
     return {
       type: messageTypes.EDIT_ENTRY,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       entryID: rawMessageInfo.entryID,
       date: rawMessageInfo.date,
       text: rawMessageInfo.text,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: EditEntryMessageData,
     id: ?string,
   ): RawEditEntryMessageInfo {
     invariant(id, 'RawEditEntryMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(messageInfo: EditEntryMessageInfo): EntityText {
     const date = prettyDate(messageInfo.date);
     const creator = ET.user({ userInfo: messageInfo.creator });
     const { text } = messageInfo;
     return ET`${creator} updated the text of an event scheduled for ${date}: "${text}"`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     return notifTextsForEntryCreationOrEdit(messageInfos, threadInfo);
   },
 
   notificationCollapseKey(rawMessageInfo: RawEditEntryMessageInfo): string {
     return joinResult(rawMessageInfo.creatorID, rawMessageInfo.entryID);
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawEditEntryMessageInfoValidator,
 });
diff --git a/lib/shared/messages/join-thread-message-spec.js b/lib/shared/messages/join-thread-message-spec.js
index 3dabd1106..cca5ee26c 100644
--- a/lib/shared/messages/join-thread-message-spec.js
+++ b/lib/shared/messages/join-thread-message-spec.js
@@ -1,128 +1,127 @@
 // @flow
 
 import invariant from 'invariant';
 
 import type { MessageSpec, RobotextParams } from './message-spec.js';
 import { joinResult } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type JoinThreadMessageData,
   type JoinThreadMessageInfo,
   type RawJoinThreadMessageInfo,
   rawJoinThreadMessageInfoValidator,
 } from '../../types/messages/join-thread.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import {
   type EntityText,
   ET,
   pluralizeEntityText,
 } from '../../utils/entity-text.js';
 import { values } from '../../utils/objects.js';
 
 export const joinThreadMessageSpec: MessageSpec<
   JoinThreadMessageData,
   RawJoinThreadMessageInfo,
   JoinThreadMessageInfo,
 > = Object.freeze({
   rawMessageInfoFromServerDBRow(row: Object): RawJoinThreadMessageInfo {
     return {
       type: messageTypes.JOIN_THREAD,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawJoinThreadMessageInfo {
     const rawJoinThreadMessageInfo: RawJoinThreadMessageInfo = {
       type: messageTypes.JOIN_THREAD,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
     };
     return rawJoinThreadMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawJoinThreadMessageInfo,
     creator: RelativeUserInfo,
   ): JoinThreadMessageInfo {
     return {
       type: messageTypes.JOIN_THREAD,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: JoinThreadMessageData,
     id: ?string,
   ): RawJoinThreadMessageInfo {
     invariant(id, 'RawJoinThreadMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(
     messageInfo: JoinThreadMessageInfo,
     params: RobotextParams,
   ): EntityText {
     const creator = ET.user({ userInfo: messageInfo.creator });
     return ET`${creator} joined ${ET.thread({
       display: 'alwaysDisplayShortName',
       threadID: messageInfo.threadID,
       threadType: params.threadInfo?.type,
       parentThreadID: params.threadInfo?.parentThreadID,
     })}`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const joinerArray: { [string]: RelativeUserInfo } = {};
     for (const messageInfo of messageInfos) {
       invariant(
         messageInfo.type === messageTypes.JOIN_THREAD,
         'messageInfo should be messageTypes.JOIN_THREAD!',
       );
       joinerArray[messageInfo.creator.id] = messageInfo.creator;
     }
     const joiners = values(joinerArray);
     const joiningUsers = pluralizeEntityText(
       joiners.map(user => ET`${ET.user({ userInfo: user })}`),
     );
 
     const body = ET`${joiningUsers} joined`;
     const thread = ET.thread({ display: 'shortName', threadInfo });
     const merged = ET`${body} ${thread}`;
 
     return {
       merged,
       title: threadInfo.uiName,
       body,
     };
   },
 
   notificationCollapseKey(rawMessageInfo: RawJoinThreadMessageInfo): string {
     return joinResult(rawMessageInfo.type, rawMessageInfo.threadID);
   },
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawJoinThreadMessageInfoValidator,
 });
diff --git a/lib/shared/messages/leave-thread-message-spec.js b/lib/shared/messages/leave-thread-message-spec.js
index 314841d74..8fe5248ff 100644
--- a/lib/shared/messages/leave-thread-message-spec.js
+++ b/lib/shared/messages/leave-thread-message-spec.js
@@ -1,128 +1,127 @@
 // @flow
 
 import invariant from 'invariant';
 
 import type { MessageSpec, RobotextParams } from './message-spec.js';
 import { joinResult } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type LeaveThreadMessageData,
   type LeaveThreadMessageInfo,
   type RawLeaveThreadMessageInfo,
   rawLeaveThreadMessageInfoValidator,
 } from '../../types/messages/leave-thread.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import {
   type EntityText,
   ET,
   pluralizeEntityText,
 } from '../../utils/entity-text.js';
 import { values } from '../../utils/objects.js';
 
 export const leaveThreadMessageSpec: MessageSpec<
   LeaveThreadMessageData,
   RawLeaveThreadMessageInfo,
   LeaveThreadMessageInfo,
 > = Object.freeze({
   rawMessageInfoFromServerDBRow(row: Object): RawLeaveThreadMessageInfo {
     return {
       type: messageTypes.LEAVE_THREAD,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawLeaveThreadMessageInfo {
     const rawLeaveThreadMessageInfo: RawLeaveThreadMessageInfo = {
       type: messageTypes.LEAVE_THREAD,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
     };
     return rawLeaveThreadMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawLeaveThreadMessageInfo,
     creator: RelativeUserInfo,
   ): LeaveThreadMessageInfo {
     return {
       type: messageTypes.LEAVE_THREAD,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: LeaveThreadMessageData,
     id: ?string,
   ): RawLeaveThreadMessageInfo {
     invariant(id, 'RawLeaveThreadMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(
     messageInfo: LeaveThreadMessageInfo,
     params: RobotextParams,
   ): EntityText {
     const creator = ET.user({ userInfo: messageInfo.creator });
     return ET`${creator} left ${ET.thread({
       display: 'alwaysDisplayShortName',
       threadID: messageInfo.threadID,
       threadType: params.threadInfo?.type,
       parentThreadID: params.threadInfo?.parentThreadID,
     })}`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const leaverBeavers: { [string]: RelativeUserInfo } = {};
     for (const messageInfo of messageInfos) {
       invariant(
         messageInfo.type === messageTypes.LEAVE_THREAD,
         'messageInfo should be messageTypes.LEAVE_THREAD!',
       );
       leaverBeavers[messageInfo.creator.id] = messageInfo.creator;
     }
     const leavers = values(leaverBeavers);
     const leavingUsers = pluralizeEntityText(
       leavers.map(user => ET`${ET.user({ userInfo: user })}`),
     );
 
     const body = ET`${leavingUsers} left`;
     const thread = ET.thread({ display: 'shortName', threadInfo });
     const merged = ET`${body} ${thread}`;
 
     return {
       merged,
       title: threadInfo.uiName,
       body,
     };
   },
 
   notificationCollapseKey(rawMessageInfo: RawLeaveThreadMessageInfo): string {
     return joinResult(rawMessageInfo.type, rawMessageInfo.threadID);
   },
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawLeaveThreadMessageInfoValidator,
 });
diff --git a/lib/shared/messages/message-spec.js b/lib/shared/messages/message-spec.js
index 54662cfb3..1042bd654 100644
--- a/lib/shared/messages/message-spec.js
+++ b/lib/shared/messages/message-spec.js
@@ -1,125 +1,124 @@
 // @flow
 
 import type { TType } from 'tcomb';
 
 import type { PlatformDetails } from '../../types/device-types.js';
 import type { Media } from '../../types/media-types.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
   RawComposableMessageInfo,
   RawMessageInfo,
   RawRobotextMessageInfo,
 } from '../../types/message-types.js';
 import type { RawUnsupportedMessageInfo } from '../../types/messages/unsupported.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo, UserInfo } from '../../types/user-types.js';
 import type { EntityText } from '../../utils/entity-text.js';
 import { type ParserRules } from '../markdown.js';
 
 export type MessageTitleParam<Info> = {
   +messageInfo: Info,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +markdownRules: ParserRules,
 };
 
 export type RawMessageInfoFromServerDBRowParams = {
   +localID: ?string,
   +media?: $ReadOnlyArray<Media>,
   +derivedMessages?: $ReadOnlyMap<
     string,
     RawComposableMessageInfo | RawRobotextMessageInfo,
   >,
 };
 
 export type CreateMessageInfoParams = {
   +threadInfos: {
-    +[id: string]: LegacyThreadInfo | ThreadInfo,
+    +[id: string]: ThreadInfo,
   },
   +createMessageInfoFromRaw: (rawInfo: RawMessageInfo) => ?MessageInfo,
   +createRelativeUserInfos: (
     userIDs: $ReadOnlyArray<string>,
   ) => RelativeUserInfo[],
 };
 
 export type RobotextParams = {
-  +threadInfo: ?LegacyThreadInfo | ?ThreadInfo,
-  +parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  +threadInfo: ?ThreadInfo,
+  +parentThreadInfo: ?ThreadInfo,
 };
 
 export type NotificationTextsParams = {
   +notifTargetUserInfo: UserInfo,
-  +parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  +parentThreadInfo: ?ThreadInfo,
 };
 
 export type GeneratesNotifsParams = {
   +notifTargetUserID: string,
   +userNotMemberOfSubthreads: Set<string>,
   +fetchMessageInfoByID: (messageID: string) => Promise<?RawMessageInfo>,
 };
 
 export const pushTypes = Object.freeze({
   NOTIF: 'notif',
   RESCIND: 'rescind',
 });
 export type PushType = $Values<typeof pushTypes>;
 
 export type CreationSideEffectsFunc<RawInfo> = (
   messageInfo: RawInfo,
-  threadInfo: LegacyThreadInfo | ThreadInfo,
-  parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  threadInfo: ThreadInfo,
+  parentThreadInfo: ?ThreadInfo,
 ) => Promise<mixed>;
 
 export type MessageSpec<Data, RawInfo, Info> = {
   +messageContentForServerDB?: (data: Data | RawInfo) => string,
   +messageContentForClientDB?: (data: RawInfo) => string,
   +messageTitle?: (param: MessageTitleParam<Info>) => EntityText,
   +rawMessageInfoFromServerDBRow?: (
     row: Object,
     params: RawMessageInfoFromServerDBRowParams,
   ) => ?RawInfo,
   +rawMessageInfoFromClientDB: (
     clientDBMessageInfo: ClientDBMessageInfo,
   ) => RawInfo,
   +createMessageInfo: (
     rawMessageInfo: RawInfo,
     creator: RelativeUserInfo,
     params: CreateMessageInfoParams,
   ) => ?Info,
   +rawMessageInfoFromMessageData?: (messageData: Data, id: ?string) => RawInfo,
   +robotext?: (messageInfo: Info, params: RobotextParams) => EntityText,
   +shimUnsupportedMessageInfo?: (
     rawMessageInfo: RawInfo,
     platformDetails: ?PlatformDetails,
   ) => RawInfo | RawUnsupportedMessageInfo,
   +unshimMessageInfo?: (
     unwrapped: RawInfo,
     messageInfo: RawMessageInfo,
   ) => ?RawMessageInfo,
   +notificationTexts?: (
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
     params: NotificationTextsParams,
   ) => Promise<?NotifTexts>,
   +notificationCollapseKey?: (
     rawMessageInfo: RawInfo,
     messageData: Data,
   ) => ?string,
   +generatesNotifs?: (
     rawMessageInfo: RawInfo,
     messageData: Data,
     params: GeneratesNotifsParams,
   ) => Promise<?PushType>,
   +userIDs?: (rawMessageInfo: RawInfo) => $ReadOnlyArray<string>,
   +startsThread?: boolean,
   +threadIDs?: (rawMessageInfo: RawInfo) => $ReadOnlyArray<string>,
   +includedInRepliesCount?: boolean,
   +canBeSidebarSource: boolean,
   +canBePinned: boolean,
   +canBeRenderedIndependently?: boolean,
   +parseDerivedMessages?: (row: Object, requiredIDs: Set<string>) => void,
   +useCreationSideEffectsFunc?: () => CreationSideEffectsFunc<RawInfo>,
   +validator: TType<RawInfo>,
 };
diff --git a/lib/shared/messages/multimedia-message-spec.js b/lib/shared/messages/multimedia-message-spec.js
index 51b319f64..f4287b5f1 100644
--- a/lib/shared/messages/multimedia-message-spec.js
+++ b/lib/shared/messages/multimedia-message-spec.js
@@ -1,382 +1,381 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   type MessageSpec,
   type MessageTitleParam,
   pushTypes,
   type RawMessageInfoFromServerDBRowParams,
 } from './message-spec.js';
 import { joinResult } from './utils.js';
 import {
   contentStringForMediaArray,
   isMediaBlobServiceHosted,
   multimediaMessagePreview,
   versionSpecificMediaMessageFormat,
 } from '../../media/media-utils.js';
 import type { PlatformDetails } from '../../types/device-types.js';
 import {
   assertMessageType,
   messageTypes,
 } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
   RawMessageInfo,
 } from '../../types/message-types.js';
 import {
   isMediaMessageType,
   rawMultimediaMessageInfoValidator,
 } from '../../types/message-types.js';
 import type {
   ImagesMessageData,
   ImagesMessageInfo,
   RawImagesMessageInfo,
 } from '../../types/messages/images.js';
 import type {
   MediaMessageData,
   MediaMessageInfo,
   RawMediaMessageInfo,
 } from '../../types/messages/media.js';
 import { getMediaMessageServerDBContentsFromMedia } from '../../types/messages/media.js';
 import type { RawUnsupportedMessageInfo } from '../../types/messages/unsupported.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { ET } from '../../utils/entity-text.js';
 import {
   translateClientDBMediaInfosToMedia,
   translateClientDBMediaInfoToImage,
 } from '../../utils/message-ops-utils.js';
 import { createMediaMessageInfo } from '../message-utils.js';
 import { threadIsGroupChat } from '../thread-utils.js';
 import { FUTURE_CODE_VERSION, hasMinCodeVersion } from '../version-utils.js';
 
 type MultimediaMessageSpec = MessageSpec<
   MediaMessageData | ImagesMessageData,
   RawMediaMessageInfo | RawImagesMessageInfo,
   MediaMessageInfo | ImagesMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data:
       | MediaMessageData
       | ImagesMessageData
       | RawMediaMessageInfo
       | RawImagesMessageInfo,
   ) => string,
   ...
 };
 
 export const multimediaMessageSpec: MultimediaMessageSpec = Object.freeze({
   messageContentForServerDB(
     data:
       | MediaMessageData
       | ImagesMessageData
       | RawMediaMessageInfo
       | RawImagesMessageInfo,
   ): string {
     if (data.type === messageTypes.MULTIMEDIA) {
       return JSON.stringify(
         getMediaMessageServerDBContentsFromMedia(data.media),
       );
     }
     const mediaIDs = data.media.map(media => parseInt(media.id, 10));
     return JSON.stringify(mediaIDs);
   },
 
   messageContentForClientDB(
     data: RawMediaMessageInfo | RawImagesMessageInfo,
   ): string {
     return multimediaMessageSpec.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawImagesMessageInfo | RawMediaMessageInfo {
     const messageType = assertMessageType(parseInt(clientDBMessageInfo.type));
     invariant(
       isMediaMessageType(messageType),
       'message must be of type IMAGES or MULTIMEDIA',
     );
     invariant(
       clientDBMessageInfo.media_infos !== null &&
         clientDBMessageInfo.media_infos !== undefined,
       `media_infos must be defined`,
     );
 
     let rawMessageInfo: RawImagesMessageInfo | RawMediaMessageInfo =
       messageType === messageTypes.IMAGES
         ? {
             type: messageTypes.IMAGES,
             threadID: clientDBMessageInfo.thread,
             creatorID: clientDBMessageInfo.user,
             time: parseInt(clientDBMessageInfo.time),
             media:
               clientDBMessageInfo.media_infos?.map(
                 translateClientDBMediaInfoToImage,
               ) ?? [],
           }
         : {
             type: messageTypes.MULTIMEDIA,
             threadID: clientDBMessageInfo.thread,
             creatorID: clientDBMessageInfo.user,
             time: parseInt(clientDBMessageInfo.time),
             media: translateClientDBMediaInfosToMedia(clientDBMessageInfo),
           };
 
     if (clientDBMessageInfo.local_id) {
       rawMessageInfo = {
         ...rawMessageInfo,
         localID: clientDBMessageInfo.local_id,
       };
     }
     if (clientDBMessageInfo.id !== clientDBMessageInfo.local_id) {
       rawMessageInfo = {
         ...rawMessageInfo,
         id: clientDBMessageInfo.id,
       };
     }
     return rawMessageInfo;
   },
 
   messageTitle({
     messageInfo,
   }: MessageTitleParam<MediaMessageInfo | ImagesMessageInfo>) {
     const creator = ET.user({ userInfo: messageInfo.creator });
     const preview = multimediaMessagePreview(messageInfo);
     return ET`${creator} ${preview}`;
   },
 
   rawMessageInfoFromServerDBRow(
     row: Object,
     params: RawMessageInfoFromServerDBRowParams,
   ): RawMediaMessageInfo | RawImagesMessageInfo {
     const { localID, media } = params;
     invariant(media, 'Media should be provided');
     return createMediaMessageInfo({
       threadID: row.threadID.toString(),
       creatorID: row.creatorID.toString(),
       media,
       id: row.id.toString(),
       localID,
       time: row.time,
     });
   },
 
   createMessageInfo(
     rawMessageInfo: RawMediaMessageInfo | RawImagesMessageInfo,
     creator: RelativeUserInfo,
   ): ?(MediaMessageInfo | ImagesMessageInfo) {
     if (rawMessageInfo.type === messageTypes.IMAGES) {
       let messageInfo: ImagesMessageInfo = {
         type: messageTypes.IMAGES,
         threadID: rawMessageInfo.threadID,
         creator,
         time: rawMessageInfo.time,
         media: rawMessageInfo.media,
       };
       if (rawMessageInfo.id) {
         messageInfo = { ...messageInfo, id: rawMessageInfo.id };
       }
       if (rawMessageInfo.localID) {
         messageInfo = { ...messageInfo, localID: rawMessageInfo.localID };
       }
       return messageInfo;
     } else if (rawMessageInfo.type === messageTypes.MULTIMEDIA) {
       let messageInfo: MediaMessageInfo = {
         type: messageTypes.MULTIMEDIA,
         threadID: rawMessageInfo.threadID,
         creator,
         time: rawMessageInfo.time,
         media: rawMessageInfo.media,
       };
       if (rawMessageInfo.id) {
         messageInfo = { ...messageInfo, id: rawMessageInfo.id };
       }
       if (rawMessageInfo.localID) {
         messageInfo = { ...messageInfo, localID: rawMessageInfo.localID };
       }
       return messageInfo;
     }
     return undefined;
   },
 
   rawMessageInfoFromMessageData(
     messageData: MediaMessageData | ImagesMessageData,
     id: ?string,
   ): RawMediaMessageInfo | RawImagesMessageInfo {
     const { sidebarCreation, ...rest } = messageData;
     if (rest.type === messageTypes.IMAGES && id) {
       return ({ ...rest, id }: RawImagesMessageInfo);
     } else if (rest.type === messageTypes.IMAGES) {
       return ({ ...rest }: RawImagesMessageInfo);
     } else if (id) {
       return ({ ...rest, id }: RawMediaMessageInfo);
     } else {
       return ({ ...rest }: RawMediaMessageInfo);
     }
   },
 
   shimUnsupportedMessageInfo(
     rawMessageInfo: RawMediaMessageInfo | RawImagesMessageInfo,
     platformDetails: ?PlatformDetails,
   ): RawMediaMessageInfo | RawImagesMessageInfo | RawUnsupportedMessageInfo {
     if (rawMessageInfo.type === messageTypes.IMAGES) {
       return rawMessageInfo;
     }
 
     const messageInfo = versionSpecificMediaMessageFormat(
       rawMessageInfo,
       platformDetails,
     );
 
     const containsBlobServiceMedia = messageInfo.media.some(
       isMediaBlobServiceHosted,
     );
     const containsEncryptedMedia = messageInfo.media.some(
       media =>
         media.type === 'encrypted_photo' || media.type === 'encrypted_video',
     );
     if (
       !containsBlobServiceMedia &&
       !containsEncryptedMedia &&
       hasMinCodeVersion(platformDetails, { native: 158 })
     ) {
       return messageInfo;
     }
     if (
       !containsBlobServiceMedia &&
       hasMinCodeVersion(platformDetails, { native: 205 })
     ) {
       return messageInfo;
     }
     if (hasMinCodeVersion(platformDetails, { native: FUTURE_CODE_VERSION })) {
       return messageInfo;
     }
 
     const { id } = messageInfo;
     invariant(id !== null && id !== undefined, 'id should be set on server');
     return {
       type: messageTypes.UNSUPPORTED,
       id,
       threadID: messageInfo.threadID,
       creatorID: messageInfo.creatorID,
       time: messageInfo.time,
       robotext: multimediaMessagePreview(messageInfo),
       unsupportedMessageInfo: messageInfo,
     };
   },
 
   unshimMessageInfo(
     unwrapped: RawMediaMessageInfo | RawImagesMessageInfo,
     messageInfo: RawMessageInfo,
   ): ?RawMessageInfo {
     if (unwrapped.type === messageTypes.IMAGES) {
       return {
         ...unwrapped,
         media: unwrapped.media.map(media => {
           if (media.dimensions) {
             return media;
           }
           const dimensions = preDimensionUploads[media.id];
           invariant(
             dimensions,
             'only four photos were uploaded before dimensions were calculated, ' +
               `and ${media.id} was not one of them`,
           );
           return { ...media, dimensions };
         }),
       };
     } else if (unwrapped.type === messageTypes.MULTIMEDIA) {
       for (const media of unwrapped.media) {
         if (isMediaBlobServiceHosted(media)) {
           return messageInfo;
         }
         const { type } = media;
         if (
           type !== 'photo' &&
           type !== 'video' &&
           type !== 'encrypted_photo' &&
           type !== 'encrypted_video'
         ) {
           return messageInfo;
         }
       }
     }
     return undefined;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const media = [];
     for (const messageInfo of messageInfos) {
       invariant(
         messageInfo.type === messageTypes.IMAGES ||
           messageInfo.type === messageTypes.MULTIMEDIA,
         'messageInfo should be multimedia type!',
       );
       for (const singleMedia of messageInfo.media) {
         media.push(singleMedia);
       }
     }
     const contentString = contentStringForMediaArray(media);
     const creator = ET.user({ userInfo: messageInfos[0].creator });
 
     let body, merged;
     if (!threadInfo.name && !threadIsGroupChat(threadInfo)) {
       body = `sent you ${contentString}`;
       merged = body;
     } else {
       body = `sent ${contentString}`;
       const thread = ET.thread({ display: 'shortName', threadInfo });
       merged = ET`${body} to ${thread}`;
     }
     merged = ET`${creator} ${merged}`;
 
     return {
       merged,
       body,
       title: threadInfo.uiName,
       prefix: ET`${creator}`,
     };
   },
 
   notificationCollapseKey(
     rawMessageInfo: RawMediaMessageInfo | RawImagesMessageInfo,
   ): string {
     // We use the legacy constant here to collapse both types into one
     return joinResult(
       messageTypes.IMAGES,
       rawMessageInfo.threadID,
       rawMessageInfo.creatorID,
     );
   },
 
   generatesNotifs: async (
     rawMessageInfo: RawMediaMessageInfo | RawImagesMessageInfo,
     messageData: MediaMessageData | ImagesMessageData,
   ) => (messageData.sidebarCreation ? undefined : pushTypes.NOTIF),
 
   includedInRepliesCount: true,
 
   canBeSidebarSource: true,
 
   canBePinned: true,
 
   validator: rawMultimediaMessageInfoValidator,
 });
 
 // Four photos were uploaded before dimensions were calculated server-side,
 // and delivered to clients without dimensions in the MultimediaMessageInfo.
 const preDimensionUploads = {
   '156642': { width: 1440, height: 1080 },
   '156649': { width: 720, height: 803 },
   '156794': { width: 720, height: 803 },
   '156877': { width: 574, height: 454 },
 };
diff --git a/lib/shared/messages/reaction-message-spec.js b/lib/shared/messages/reaction-message-spec.js
index 99c0ddcf5..fdfed7753 100644
--- a/lib/shared/messages/reaction-message-spec.js
+++ b/lib/shared/messages/reaction-message-spec.js
@@ -1,229 +1,228 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   type GeneratesNotifsParams,
   type MessageSpec,
   type MessageTitleParam,
   pushTypes,
 } from './message-spec.js';
 import { assertSingleMessageInfo, joinResult } from './utils.js';
 import type { PlatformDetails } from '../../types/device-types.js';
 import {
   assertMessageType,
   messageTypes,
 } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type RawReactionMessageInfo,
   rawReactionMessageInfoValidator,
   type ReactionMessageData,
   type ReactionMessageInfo,
 } from '../../types/messages/reaction.js';
 import type { RawUnsupportedMessageInfo } from '../../types/messages/unsupported.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { ET } from '../../utils/entity-text.js';
 import { threadIsGroupChat } from '../thread-utils.js';
 import { hasMinCodeVersion } from '../version-utils.js';
 
 export const reactionMessageSpec: MessageSpec<
   ReactionMessageData,
   RawReactionMessageInfo,
   ReactionMessageInfo,
 > = Object.freeze({
   messageContentForServerDB(
     data: ReactionMessageData | RawReactionMessageInfo,
   ): string {
     return JSON.stringify({
       reaction: data.reaction,
       action: data.action,
     });
   },
 
   messageContentForClientDB(data: RawReactionMessageInfo): string {
     return JSON.stringify({
       targetMessageID: data.targetMessageID,
       reaction: data.reaction,
       action: data.action,
     });
   },
 
   messageTitle({ messageInfo }: MessageTitleParam<ReactionMessageInfo>) {
     const creator = ET.user({ userInfo: messageInfo.creator });
     const preview =
       messageInfo.action === 'add_reaction'
         ? `reacted ${messageInfo.reaction} to a message`
         : 'unreacted to a message';
     return ET`${creator} ${preview}`;
   },
 
   rawMessageInfoFromServerDBRow(row: Object): RawReactionMessageInfo {
     invariant(
       row.targetMessageID !== null && row.targetMessageID !== undefined,
       'targetMessageID should be set',
     );
 
     const content = JSON.parse(row.content);
 
     return {
       type: messageTypes.REACTION,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       targetMessageID: row.targetMessageID.toString(),
       reaction: content.reaction,
       action: content.action,
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawReactionMessageInfo {
     const messageType = assertMessageType(parseInt(clientDBMessageInfo.type));
     invariant(
       messageType === messageTypes.REACTION,
       'message must be of type REACTION',
     );
     invariant(
       clientDBMessageInfo.content !== undefined &&
         clientDBMessageInfo.content !== null,
       'content must be defined for Reaction',
     );
     const content = JSON.parse(clientDBMessageInfo.content);
 
     const rawReactionMessageInfo: RawReactionMessageInfo = {
       type: messageTypes.REACTION,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       targetMessageID: content.targetMessageID,
       reaction: content.reaction,
       action: content.action,
     };
 
     return rawReactionMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawReactionMessageInfo,
     creator: RelativeUserInfo,
   ): ReactionMessageInfo {
     return {
       type: messageTypes.REACTION,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       targetMessageID: rawMessageInfo.targetMessageID,
       reaction: rawMessageInfo.reaction,
       action: rawMessageInfo.action,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: ReactionMessageData,
     id: ?string,
   ): RawReactionMessageInfo {
     invariant(id, 'RawReactionMessageInfo needs id');
     return { ...messageData, id };
   },
 
   shimUnsupportedMessageInfo(
     rawMessageInfo: RawReactionMessageInfo,
     platformDetails: ?PlatformDetails,
   ): RawReactionMessageInfo | RawUnsupportedMessageInfo {
     if (hasMinCodeVersion(platformDetails, { native: 167 })) {
       return rawMessageInfo;
     }
     const { id } = rawMessageInfo;
     invariant(id !== null && id !== undefined, 'id should be set on server');
 
     return {
       type: messageTypes.UNSUPPORTED,
       id,
       threadID: rawMessageInfo.threadID,
       creatorID: rawMessageInfo.creatorID,
       time: rawMessageInfo.time,
       robotext: 'reacted to a message',
       unsupportedMessageInfo: rawMessageInfo,
     };
   },
 
   unshimMessageInfo(unwrapped: RawReactionMessageInfo): RawReactionMessageInfo {
     return unwrapped;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const messageInfo = assertSingleMessageInfo(messageInfos);
     invariant(
       messageInfo.type === messageTypes.REACTION,
       'messageInfo should be reaction type',
     );
 
     const creator = ET.user({ userInfo: messageInfo.creator });
     const body =
       messageInfo.action === 'add_reaction'
         ? `reacted ${messageInfo.reaction} to your message`
         : 'unreacted to your message';
 
     let merged = ET`${creator} ${body}`;
     if (threadInfo.name || threadIsGroupChat(threadInfo)) {
       const thread = ET.thread({ display: 'shortName', threadInfo });
       merged = ET`${merged} in ${thread}`;
     }
 
     return {
       merged,
       body,
       title: threadInfo.uiName,
       prefix: ET`${creator}`,
     };
   },
 
   notificationCollapseKey(rawMessageInfo: RawReactionMessageInfo): string {
     return joinResult(
       rawMessageInfo.type,
       rawMessageInfo.threadID,
       rawMessageInfo.creatorID,
       rawMessageInfo.targetMessageID,
     );
   },
 
   generatesNotifs: async (
     rawMessageInfo: RawReactionMessageInfo,
     messageData: ReactionMessageData,
     params: GeneratesNotifsParams,
   ) => {
     const { action } = rawMessageInfo;
     const { notifTargetUserID, fetchMessageInfoByID } = params;
 
     const targetMessageInfo = await fetchMessageInfoByID(
       rawMessageInfo.targetMessageID,
     );
 
     if (targetMessageInfo?.creatorID !== notifTargetUserID) {
       return undefined;
     }
     return action === 'add_reaction' ? pushTypes.NOTIF : pushTypes.RESCIND;
   },
 
   canBeSidebarSource: false,
 
   canBePinned: false,
 
   canBeRenderedIndependently: false,
 
   validator: rawReactionMessageInfoValidator,
 });
diff --git a/lib/shared/messages/remove-members-message-spec.js b/lib/shared/messages/remove-members-message-spec.js
index 155858337..b3fce8d2a 100644
--- a/lib/shared/messages/remove-members-message-spec.js
+++ b/lib/shared/messages/remove-members-message-spec.js
@@ -1,190 +1,189 @@
 // @flow
 
 import invariant from 'invariant';
 
 import type {
   CreateMessageInfoParams,
   MessageSpec,
   NotificationTextsParams,
 } from './message-spec.js';
 import { joinResult } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type RawRemoveMembersMessageInfo,
   rawRemoveMembersMessageInfoValidator,
   type RemoveMembersMessageData,
   type RemoveMembersMessageInfo,
 } from '../../types/messages/remove-members.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import {
   type EntityText,
   ET,
   pluralizeEntityText,
 } from '../../utils/entity-text.js';
 import { values } from '../../utils/objects.js';
 import { notifRobotextForMessageInfo } from '../notif-utils.js';
 
 type RemoveMembersMessageSpec = MessageSpec<
   RemoveMembersMessageData,
   RawRemoveMembersMessageInfo,
   RemoveMembersMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: RemoveMembersMessageData | RawRemoveMembersMessageInfo,
   ) => string,
   ...
 };
 
 export const removeMembersMessageSpec: RemoveMembersMessageSpec = Object.freeze(
   {
     messageContentForServerDB(
       data: RemoveMembersMessageData | RawRemoveMembersMessageInfo,
     ): string {
       return JSON.stringify(data.removedUserIDs);
     },
 
     messageContentForClientDB(data: RawRemoveMembersMessageInfo): string {
       return removeMembersMessageSpec.messageContentForServerDB(data);
     },
 
     rawMessageInfoFromServerDBRow(row: Object): RawRemoveMembersMessageInfo {
       return {
         type: messageTypes.REMOVE_MEMBERS,
         id: row.id.toString(),
         threadID: row.threadID.toString(),
         time: row.time,
         creatorID: row.creatorID.toString(),
         removedUserIDs: JSON.parse(row.content),
       };
     },
 
     rawMessageInfoFromClientDB(
       clientDBMessageInfo: ClientDBMessageInfo,
     ): RawRemoveMembersMessageInfo {
       const content = clientDBMessageInfo.content;
       invariant(
         content !== undefined && content !== null,
         'content must be defined for RemoveMembers',
       );
       const rawRemoveMembersMessageInfo: RawRemoveMembersMessageInfo = {
         type: messageTypes.REMOVE_MEMBERS,
         id: clientDBMessageInfo.id,
         threadID: clientDBMessageInfo.thread,
         time: parseInt(clientDBMessageInfo.time),
         creatorID: clientDBMessageInfo.user,
         removedUserIDs: JSON.parse(content),
       };
       return rawRemoveMembersMessageInfo;
     },
 
     createMessageInfo(
       rawMessageInfo: RawRemoveMembersMessageInfo,
       creator: RelativeUserInfo,
       params: CreateMessageInfoParams,
     ): RemoveMembersMessageInfo {
       const removedMembers = params.createRelativeUserInfos(
         rawMessageInfo.removedUserIDs,
       );
       return {
         type: messageTypes.REMOVE_MEMBERS,
         id: rawMessageInfo.id,
         threadID: rawMessageInfo.threadID,
         creator,
         time: rawMessageInfo.time,
         removedMembers,
       };
     },
 
     rawMessageInfoFromMessageData(
       messageData: RemoveMembersMessageData,
       id: ?string,
     ): RawRemoveMembersMessageInfo {
       invariant(id, 'RawRemoveMembersMessageInfo needs id');
       return { ...messageData, id };
     },
 
     robotext(messageInfo: RemoveMembersMessageInfo): EntityText {
       const users = messageInfo.removedMembers;
       invariant(users.length !== 0, 'added who??');
 
       const creator = ET.user({ userInfo: messageInfo.creator });
       const removedUsers = pluralizeEntityText(
         users.map(user => ET`${ET.user({ userInfo: user })}`),
       );
 
       return ET`${creator} removed ${removedUsers}`;
     },
 
     async notificationTexts(
       messageInfos: $ReadOnlyArray<MessageInfo>,
-      threadInfo: LegacyThreadInfo | ThreadInfo,
+      threadInfo: ThreadInfo,
       params: NotificationTextsParams,
     ): Promise<NotifTexts> {
       const removedMembersObject: { [string]: RelativeUserInfo } = {};
       for (const messageInfo of messageInfos) {
         invariant(
           messageInfo.type === messageTypes.REMOVE_MEMBERS,
           'messageInfo should be messageTypes.REMOVE_MEMBERS!',
         );
         for (const member of messageInfo.removedMembers) {
           removedMembersObject[member.id] = member;
         }
       }
       const removedMembers = values(removedMembersObject);
 
       const mostRecentMessageInfo = messageInfos[0];
       invariant(
         mostRecentMessageInfo.type === messageTypes.REMOVE_MEMBERS,
         'messageInfo should be messageTypes.REMOVE_MEMBERS!',
       );
       const mergedMessageInfo = { ...mostRecentMessageInfo, removedMembers };
 
       const { parentThreadInfo } = params;
       const robotext = notifRobotextForMessageInfo(
         mergedMessageInfo,
         threadInfo,
         parentThreadInfo,
       );
       const merged = ET`${robotext} from ${ET.thread({
         display: 'shortName',
         threadInfo,
       })}`;
       return {
         merged,
         title: threadInfo.uiName,
         body: robotext,
       };
     },
 
     notificationCollapseKey(
       rawMessageInfo: RawRemoveMembersMessageInfo,
     ): string {
       return joinResult(
         rawMessageInfo.type,
         rawMessageInfo.threadID,
         rawMessageInfo.creatorID,
       );
     },
 
     userIDs(
       rawMessageInfo: RawRemoveMembersMessageInfo,
     ): $ReadOnlyArray<string> {
       return rawMessageInfo.removedUserIDs;
     },
 
     canBeSidebarSource: true,
 
     canBePinned: false,
 
     validator: rawRemoveMembersMessageInfoValidator,
   },
 );
diff --git a/lib/shared/messages/restore-entry-message-spec.js b/lib/shared/messages/restore-entry-message-spec.js
index 553d45779..67f589728 100644
--- a/lib/shared/messages/restore-entry-message-spec.js
+++ b/lib/shared/messages/restore-entry-message-spec.js
@@ -1,154 +1,153 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { type MessageSpec, pushTypes } from './message-spec.js';
 import { assertSingleMessageInfo } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type RawRestoreEntryMessageInfo,
   rawRestoreEntryMessageInfoValidator,
   type RestoreEntryMessageData,
   type RestoreEntryMessageInfo,
 } from '../../types/messages/restore-entry.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { prettyDate } from '../../utils/date-utils.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
 
 type RestoreEntryMessageSpec = MessageSpec<
   RestoreEntryMessageData,
   RawRestoreEntryMessageInfo,
   RestoreEntryMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: RestoreEntryMessageData | RawRestoreEntryMessageInfo,
   ) => string,
   ...
 };
 
 export const restoreEntryMessageSpec: RestoreEntryMessageSpec = Object.freeze({
   messageContentForServerDB(
     data: RestoreEntryMessageData | RawRestoreEntryMessageInfo,
   ): string {
     return JSON.stringify({
       entryID: data.entryID,
       date: data.date,
       text: data.text,
     });
   },
 
   messageContentForClientDB(data: RawRestoreEntryMessageInfo): string {
     return restoreEntryMessageSpec.messageContentForServerDB(data);
   },
 
   rawMessageInfoFromServerDBRow(row: Object): RawRestoreEntryMessageInfo {
     const content = JSON.parse(row.content);
     return {
       type: messageTypes.RESTORE_ENTRY,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       entryID: content.entryID,
       date: content.date,
       text: content.text,
     };
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawRestoreEntryMessageInfo {
     invariant(
       clientDBMessageInfo.content !== undefined &&
         clientDBMessageInfo.content !== null,
       'content must be defined for RestoreEntry',
     );
     const content = JSON.parse(clientDBMessageInfo.content);
     const rawRestoreEntryMessageInfo: RawRestoreEntryMessageInfo = {
       type: messageTypes.RESTORE_ENTRY,
       id: clientDBMessageInfo.id,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       entryID: content.entryID,
       date: content.date,
       text: content.text,
     };
     return rawRestoreEntryMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawRestoreEntryMessageInfo,
     creator: RelativeUserInfo,
   ): RestoreEntryMessageInfo {
     return {
       type: messageTypes.RESTORE_ENTRY,
       id: rawMessageInfo.id,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       entryID: rawMessageInfo.entryID,
       date: rawMessageInfo.date,
       text: rawMessageInfo.text,
     };
   },
 
   rawMessageInfoFromMessageData(
     messageData: RestoreEntryMessageData,
     id: ?string,
   ): RawRestoreEntryMessageInfo {
     invariant(id, 'RawRestoreEntryMessageInfo needs id');
     return { ...messageData, id };
   },
 
   robotext(messageInfo: RestoreEntryMessageInfo): EntityText {
     const date = prettyDate(messageInfo.date);
     const creator = ET.user({ userInfo: messageInfo.creator });
     const { text } = messageInfo;
     return ET`${creator} restored an event scheduled for ${date}: "${text}"`;
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
   ): Promise<NotifTexts> {
     const messageInfo = assertSingleMessageInfo(messageInfos);
     invariant(
       messageInfo.type === messageTypes.RESTORE_ENTRY,
       'messageInfo should be messageTypes.RESTORE_ENTRY!',
     );
 
     const thread = ET.thread({ display: 'shortName', threadInfo });
     const creator = ET.user({ userInfo: messageInfo.creator });
     const date = prettyDate(messageInfo.date);
 
     const prefix = ET`${creator}`;
     let body = ET`restored an event in ${thread}`;
     body = ET`${body} scheduled for ${date}: "${messageInfo.text}"`;
     const merged = ET`${prefix} ${body}`;
 
     return {
       merged,
       title: threadInfo.uiName,
       body,
       prefix,
     };
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   canBeSidebarSource: true,
 
   canBePinned: false,
 
   validator: rawRestoreEntryMessageInfoValidator,
 });
diff --git a/lib/shared/messages/text-message-spec.js b/lib/shared/messages/text-message-spec.js
index 3aaf6c6f9..b47302908 100644
--- a/lib/shared/messages/text-message-spec.js
+++ b/lib/shared/messages/text-message-spec.js
@@ -1,335 +1,334 @@
 // @flow
 
 import invariant from 'invariant';
 import * as SimpleMarkdown from 'simple-markdown';
 
 import {
   type MessageSpec,
   type NotificationTextsParams,
   pushTypes,
   type RawMessageInfoFromServerDBRowParams,
 } from './message-spec.js';
 import { assertSingleMessageInfo, joinResult } from './utils.js';
 import {
   changeThreadSettingsActionTypes,
   useChangeThreadSettings,
 } from '../../actions/thread-actions.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type RawTextMessageInfo,
   rawTextMessageInfoValidator,
   type TextMessageData,
   type TextMessageInfo,
 } from '../../types/messages/text.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
 import { threadTypes } from '../../types/thread-types-enum.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { ET } from '../../utils/entity-text.js';
 import { useDispatchActionPromise } from '../../utils/redux-promise-utils.js';
 import {
   type ASTNode,
   type SingleASTNode,
   stripSpoilersFromMarkdownAST,
   stripSpoilersFromNotifications,
 } from '../markdown.js';
 import {
   isUserMentioned,
   renderChatMentionsWithAltText,
 } from '../mention-utils.js';
 import { notifTextsForSidebarCreation } from '../notif-utils.js';
 import {
   extractNewMentionedParentMembers,
   threadIsGroupChat,
 } from '../thread-utils.js';
 
 /**
  * most of the markdown leaves contain `content` field
  * (it is an array or a string) apart from lists,
  * which have `items` field (that holds an array)
  */
 const rawTextFromMarkdownAST = (node: ASTNode): string => {
   if (Array.isArray(node)) {
     return node.map(rawTextFromMarkdownAST).join('');
   }
   const { content, items } = node;
   if (content && typeof content === 'string') {
     return content;
   } else if (items) {
     return rawTextFromMarkdownAST(items);
   } else if (content) {
     return rawTextFromMarkdownAST(content);
   }
   return '';
 };
 
 const getFirstNonQuotedRawLine = (
   nodes: $ReadOnlyArray<SingleASTNode>,
 ): string => {
   let result = 'message';
   for (const node of nodes) {
     if (node.type === 'blockQuote') {
       result = 'quoted message';
     } else {
       const rawText = rawTextFromMarkdownAST(node);
       if (!rawText || !rawText.replace(/\s/g, '')) {
         // handles the case of an empty(or containing only white spaces)
         // new line that usually occurs between a quote and the rest
         // of the message(we don't want it as a title, thus continue)
         continue;
       }
       return rawText;
     }
   }
   return result;
 };
 
 type TextMessageSpec = MessageSpec<
   TextMessageData,
   RawTextMessageInfo,
   TextMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: TextMessageData | RawTextMessageInfo,
   ) => string,
   ...
 };
 
 export const textMessageSpec: TextMessageSpec = Object.freeze({
   messageContentForServerDB(
     data: TextMessageData | RawTextMessageInfo,
   ): string {
     return data.text;
   },
 
   messageContentForClientDB(data: RawTextMessageInfo): string {
     return textMessageSpec.messageContentForServerDB(data);
   },
 
   messageTitle({ messageInfo, markdownRules }) {
     const { text } = messageInfo;
     const parser = SimpleMarkdown.parserFor(markdownRules);
     const ast = stripSpoilersFromMarkdownAST(
       parser(text, { disableAutoBlockNewlines: true }),
     );
     return ET`${getFirstNonQuotedRawLine(ast).trim()}`;
   },
 
   rawMessageInfoFromServerDBRow(
     row: Object,
     params: RawMessageInfoFromServerDBRowParams,
   ): RawTextMessageInfo {
     let rawTextMessageInfo: RawTextMessageInfo = {
       type: messageTypes.TEXT,
       id: row.id.toString(),
       threadID: row.threadID.toString(),
       time: row.time,
       creatorID: row.creatorID.toString(),
       text: row.content,
     };
     if (params.localID) {
       rawTextMessageInfo = { ...rawTextMessageInfo, localID: params.localID };
     }
     return rawTextMessageInfo;
   },
 
   rawMessageInfoFromClientDB(
     clientDBMessageInfo: ClientDBMessageInfo,
   ): RawTextMessageInfo {
     let rawTextMessageInfo: RawTextMessageInfo = {
       type: messageTypes.TEXT,
       threadID: clientDBMessageInfo.thread,
       time: parseInt(clientDBMessageInfo.time),
       creatorID: clientDBMessageInfo.user,
       text: clientDBMessageInfo.content ?? '',
     };
     if (clientDBMessageInfo.local_id) {
       rawTextMessageInfo = {
         ...rawTextMessageInfo,
         localID: clientDBMessageInfo.local_id,
       };
     }
     if (clientDBMessageInfo.id !== clientDBMessageInfo.local_id) {
       rawTextMessageInfo = {
         ...rawTextMessageInfo,
         id: clientDBMessageInfo.id,
       };
     }
     return rawTextMessageInfo;
   },
 
   createMessageInfo(
     rawMessageInfo: RawTextMessageInfo,
     creator: RelativeUserInfo,
   ): TextMessageInfo {
     let messageInfo: TextMessageInfo = {
       type: messageTypes.TEXT,
       threadID: rawMessageInfo.threadID,
       creator,
       time: rawMessageInfo.time,
       text: rawMessageInfo.text,
     };
     if (rawMessageInfo.id) {
       messageInfo = { ...messageInfo, id: rawMessageInfo.id };
     }
     if (rawMessageInfo.localID) {
       messageInfo = { ...messageInfo, localID: rawMessageInfo.localID };
     }
     return messageInfo;
   },
 
   rawMessageInfoFromMessageData(
     messageData: TextMessageData,
     id: ?string,
   ): RawTextMessageInfo {
     const { sidebarCreation, ...rest } = messageData;
     if (id) {
       return { ...rest, id };
     } else {
       return { ...rest };
     }
   },
 
   async notificationTexts(
     messageInfos: $ReadOnlyArray<MessageInfo>,
-    threadInfo: LegacyThreadInfo | ThreadInfo,
+    threadInfo: ThreadInfo,
     params: NotificationTextsParams,
   ): Promise<?NotifTexts> {
     // We special-case sidebarCreations. Usually we don't send any notifs in
     // that case to avoid a double-notif, but we need to update the original
     // notif if somebody was @-tagged in this message
     if (
       messageInfos.length === 3 &&
       messageInfos[2].type === messageTypes.SIDEBAR_SOURCE &&
       messageInfos[1].type === messageTypes.CREATE_SIDEBAR
     ) {
       const sidebarSourceMessageInfo = messageInfos[2];
       const createSidebarMessageInfo = messageInfos[1];
 
       const sourceMessage = messageInfos[2].sourceMessage;
       const { username } = params.notifTargetUserInfo;
       if (!username) {
         // If we couldn't fetch the username for some reason, we won't be able
         // to extract @-mentions anyways, so we'll give up on updating the notif
         return null;
       }
 
       if (
         sourceMessage.type === messageTypes.TEXT &&
         isUserMentioned(username, sourceMessage.text)
       ) {
         // If the notif target was already mentioned in the source message,
         // there's no need to update the notif
         return null;
       }
 
       const messageInfo = messageInfos[0];
       invariant(
         messageInfo.type === messageTypes.TEXT,
         'messageInfo should be messageTypes.TEXT!',
       );
       if (!isUserMentioned(username, messageInfo.text)) {
         // We only need to update the notif if the notif target is mentioned
         return null;
       }
 
       return notifTextsForSidebarCreation({
         createSidebarMessageInfo,
         sidebarSourceMessageInfo,
         firstSidebarMessageInfo: messageInfo,
         threadInfo,
         params,
       });
     }
 
     const messageInfo = assertSingleMessageInfo(messageInfos);
     invariant(
       messageInfo.type === messageTypes.TEXT,
       'messageInfo should be messageTypes.TEXT!',
     );
     const transformedNotificationText = stripSpoilersFromNotifications(
       renderChatMentionsWithAltText(messageInfo.text),
     );
     if (!threadInfo.name && !threadIsGroupChat(threadInfo)) {
       const thread = ET.thread({ display: 'uiName', threadInfo });
       return {
         merged: ET`${thread}: ${transformedNotificationText}`,
         body: transformedNotificationText,
         title: threadInfo.uiName,
       };
     } else {
       const creator = ET.user({ userInfo: messageInfo.creator });
       const thread = ET.thread({ display: 'shortName', threadInfo });
       return {
         merged: ET`${creator} to ${thread}: ${transformedNotificationText}`,
         body: transformedNotificationText,
         title: threadInfo.uiName,
         prefix: ET`${creator}:`,
       };
     }
   },
 
   notificationCollapseKey(
     rawMessageInfo: RawTextMessageInfo,
     messageData: TextMessageData,
   ): ?string {
     if (!messageData.sidebarCreation) {
       return null;
     }
     return joinResult(messageTypes.CREATE_SIDEBAR, rawMessageInfo.threadID);
   },
 
   generatesNotifs: async () => pushTypes.NOTIF,
 
   includedInRepliesCount: true,
 
   useCreationSideEffectsFunc: () => {
     const dispatchActionPromise = useDispatchActionPromise();
     const callChangeThreadSettings = useChangeThreadSettings();
     return async (
       messageInfo: RawTextMessageInfo,
-      threadInfo: LegacyThreadInfo | ThreadInfo,
-      parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+      threadInfo: ThreadInfo,
+      parentThreadInfo: ?ThreadInfo,
     ) => {
       if (threadInfo.type !== threadTypes.SIDEBAR) {
         return;
       }
       invariant(parentThreadInfo, 'all sidebars should have a parent thread');
 
       const mentionedNewMembers = extractNewMentionedParentMembers(
         messageInfo.text,
         threadInfo,
         parentThreadInfo,
       );
 
       if (mentionedNewMembers.length === 0) {
         return;
       }
 
       const newMemberIDs = mentionedNewMembers.map(({ id }) => id);
       const addMembersPromise = callChangeThreadSettings({
         threadID: threadInfo.id,
         changes: { newMemberIDs },
       });
 
       void dispatchActionPromise(
         changeThreadSettingsActionTypes,
         addMembersPromise,
       );
       await addMembersPromise;
     };
   },
 
   canBeSidebarSource: true,
 
   canBePinned: true,
 
   validator: rawTextMessageInfoValidator,
 });
diff --git a/lib/shared/messages/update-relationship-message-spec.js b/lib/shared/messages/update-relationship-message-spec.js
index 5380ade0a..6db2faccc 100644
--- a/lib/shared/messages/update-relationship-message-spec.js
+++ b/lib/shared/messages/update-relationship-message-spec.js
@@ -1,178 +1,177 @@
 // @flow
 
 import invariant from 'invariant';
 
 import {
   type CreateMessageInfoParams,
   type MessageSpec,
   pushTypes,
 } from './message-spec.js';
 import { assertSingleMessageInfo } from './utils.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import type {
   ClientDBMessageInfo,
   MessageInfo,
 } from '../../types/message-types.js';
 import {
   type RawUpdateRelationshipMessageInfo,
   rawUpdateRelationshipMessageInfoValidator,
   type UpdateRelationshipMessageData,
   type UpdateRelationshipMessageInfo,
 } from '../../types/messages/update-relationship.js';
 import type { ThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts } from '../../types/notif-types.js';
-import type { LegacyThreadInfo } from '../../types/thread-types.js';
 import type { RelativeUserInfo } from '../../types/user-types.js';
 import { type EntityText, ET } from '../../utils/entity-text.js';
 
 type UpdateRelationshipMessageSpec = MessageSpec<
   UpdateRelationshipMessageData,
   RawUpdateRelationshipMessageInfo,
   UpdateRelationshipMessageInfo,
 > & {
   // We need to explicitly type this as non-optional so that
   // it can be referenced from messageContentForClientDB below
   +messageContentForServerDB: (
     data: UpdateRelationshipMessageData | RawUpdateRelationshipMessageInfo,
   ) => string,
   ...
 };
 
 export const updateRelationshipMessageSpec: UpdateRelationshipMessageSpec =
   Object.freeze({
     messageContentForServerDB(
       data: UpdateRelationshipMessageData | RawUpdateRelationshipMessageInfo,
     ): string {
       return JSON.stringify({
         operation: data.operation,
         targetID: data.targetID,
       });
     },
 
     messageContentForClientDB(data: RawUpdateRelationshipMessageInfo): string {
       return updateRelationshipMessageSpec.messageContentForServerDB(data);
     },
 
     rawMessageInfoFromServerDBRow(
       row: Object,
     ): RawUpdateRelationshipMessageInfo {
       const content = JSON.parse(row.content);
       return {
         type: messageTypes.UPDATE_RELATIONSHIP,
         id: row.id.toString(),
         threadID: row.threadID.toString(),
         time: row.time,
         creatorID: row.creatorID.toString(),
         targetID: content.targetID,
         operation: content.operation,
       };
     },
 
     rawMessageInfoFromClientDB(
       clientDBMessageInfo: ClientDBMessageInfo,
     ): RawUpdateRelationshipMessageInfo {
       invariant(
         clientDBMessageInfo.content !== undefined &&
           clientDBMessageInfo.content !== null,
         'content must be defined for UpdateRelationship',
       );
       const content = JSON.parse(clientDBMessageInfo.content);
       const rawUpdateRelationshipMessageInfo: RawUpdateRelationshipMessageInfo =
         {
           type: messageTypes.UPDATE_RELATIONSHIP,
           id: clientDBMessageInfo.id,
           threadID: clientDBMessageInfo.thread,
           time: parseInt(clientDBMessageInfo.time),
           creatorID: clientDBMessageInfo.user,
           targetID: content.targetID,
           operation: content.operation,
         };
       return rawUpdateRelationshipMessageInfo;
     },
 
     createMessageInfo(
       rawMessageInfo: RawUpdateRelationshipMessageInfo,
       creator: RelativeUserInfo,
       params: CreateMessageInfoParams,
     ): ?UpdateRelationshipMessageInfo {
       const target = params.createRelativeUserInfos([
         rawMessageInfo.targetID,
       ])[0];
       if (!target) {
         return null;
       }
       return {
         type: messageTypes.UPDATE_RELATIONSHIP,
         id: rawMessageInfo.id,
         threadID: rawMessageInfo.threadID,
         creator,
         target,
         time: rawMessageInfo.time,
         operation: rawMessageInfo.operation,
       };
     },
 
     rawMessageInfoFromMessageData(
       messageData: UpdateRelationshipMessageData,
       id: ?string,
     ): RawUpdateRelationshipMessageInfo {
       invariant(id, 'RawUpdateRelationshipMessageInfo needs id');
       return { ...messageData, id };
     },
 
     // ESLint doesn't recognize that invariant always throws
     // eslint-disable-next-line consistent-return
     robotext(messageInfo: UpdateRelationshipMessageInfo): EntityText {
       const creator = ET.user({ userInfo: messageInfo.creator });
       if (messageInfo.operation === 'request_sent') {
         const target = ET.user({ userInfo: messageInfo.target });
         return ET`${creator} sent ${target} a friend request`;
       } else if (messageInfo.operation === 'request_accepted') {
         const targetPossessive = ET.user({
           userInfo: messageInfo.target,
           possessive: true,
         });
         return ET`${creator} accepted ${targetPossessive} friend request`;
       }
       invariant(
         false,
         `Invalid operation ${messageInfo.operation} ` +
           `of message with type ${messageInfo.type}`,
       );
     },
 
     unshimMessageInfo(
       unwrapped: RawUpdateRelationshipMessageInfo,
     ): RawUpdateRelationshipMessageInfo {
       return unwrapped;
     },
 
     async notificationTexts(
       messageInfos: $ReadOnlyArray<MessageInfo>,
-      threadInfo: LegacyThreadInfo | ThreadInfo,
+      threadInfo: ThreadInfo,
     ): Promise<NotifTexts> {
       const messageInfo = assertSingleMessageInfo(messageInfos);
       const creator = ET.user({ userInfo: messageInfo.creator });
       const prefix = ET`${creator}`;
       const title = threadInfo.uiName;
       const body =
         messageInfo.operation === 'request_sent'
           ? 'sent you a friend request'
           : 'accepted your friend request';
       const merged = ET`${prefix} ${body}`;
       return {
         merged,
         body,
         title,
         prefix,
       };
     },
 
     generatesNotifs: async () => pushTypes.NOTIF,
 
     canBeSidebarSource: true,
 
     canBePinned: false,
 
     validator: rawUpdateRelationshipMessageInfoValidator,
   });
diff --git a/lib/shared/notif-utils.js b/lib/shared/notif-utils.js
index 00676d2d2..5840a4222 100644
--- a/lib/shared/notif-utils.js
+++ b/lib/shared/notif-utils.js
@@ -1,327 +1,326 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { isUserMentioned } from './mention-utils.js';
 import { robotextForMessageInfo } from './message-utils.js';
 import type { NotificationTextsParams } from './messages/message-spec.js';
 import { messageSpecs } from './messages/message-specs.js';
 import { threadNoun } from './thread-utils.js';
 import { type MessageType, messageTypes } from '../types/message-types-enum.js';
 import {
   type MessageData,
   type MessageInfo,
   type RawMessageInfo,
   type RobotextMessageInfo,
   type SidebarSourceMessageInfo,
 } from '../types/message-types.js';
 import type { CreateSidebarMessageInfo } from '../types/messages/create-sidebar.js';
 import type { TextMessageInfo } from '../types/messages/text.js';
 import type { ThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
 import type { NotifTexts, ResolvedNotifTexts } from '../types/notif-types.js';
 import { type ThreadType, threadTypes } from '../types/thread-types-enum.js';
-import type { LegacyThreadInfo } from '../types/thread-types.js';
 import type { RelativeUserInfo, UserInfo } from '../types/user-types.js';
 import { prettyDate } from '../utils/date-utils.js';
 import type { GetENSNames } from '../utils/ens-helpers.js';
 import {
   type EntityText,
   ET,
   getEntityTextAsString,
   type ThreadEntity,
 } from '../utils/entity-text.js';
 import { promiseAll } from '../utils/promises.js';
 import { trimText } from '../utils/text-utils.js';
 
 async function notifTextsForMessageInfo(
   messageInfos: MessageInfo[],
-  threadInfo: LegacyThreadInfo | ThreadInfo,
-  parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  threadInfo: ThreadInfo,
+  parentThreadInfo: ?ThreadInfo,
   notifTargetUserInfo: UserInfo,
   getENSNames: ?GetENSNames,
 ): Promise<?ResolvedNotifTexts> {
   const fullNotifTexts = await fullNotifTextsForMessageInfo(
     messageInfos,
     threadInfo,
     parentThreadInfo,
     notifTargetUserInfo,
     getENSNames,
   );
   if (!fullNotifTexts) {
     return fullNotifTexts;
   }
   const merged = trimText(fullNotifTexts.merged, 300);
   const body = trimText(fullNotifTexts.body, 300);
   const title = trimText(fullNotifTexts.title, 100);
   if (!fullNotifTexts.prefix) {
     return { merged, body, title };
   }
   const prefix = trimText(fullNotifTexts.prefix, 50);
   return { merged, body, title, prefix };
 }
 
 function notifTextsForEntryCreationOrEdit(
   messageInfos: $ReadOnlyArray<MessageInfo>,
-  threadInfo: LegacyThreadInfo | ThreadInfo,
+  threadInfo: ThreadInfo,
 ): NotifTexts {
   const hasCreateEntry = messageInfos.some(
     messageInfo => messageInfo.type === messageTypes.CREATE_ENTRY,
   );
   const messageInfo = messageInfos[0];
 
   const thread = ET.thread({ display: 'shortName', threadInfo });
   const creator = ET.user({ userInfo: messageInfo.creator });
   const prefix = ET`${creator}`;
 
   if (!hasCreateEntry) {
     invariant(
       messageInfo.type === messageTypes.EDIT_ENTRY,
       'messageInfo should be messageTypes.EDIT_ENTRY!',
     );
     const date = prettyDate(messageInfo.date);
     let body = ET`updated the text of an event in ${thread}`;
     body = ET`${body} scheduled for ${date}: "${messageInfo.text}"`;
     const merged = ET`${prefix} ${body}`;
     return {
       merged,
       title: threadInfo.uiName,
       body,
       prefix,
     };
   }
   invariant(
     messageInfo.type === messageTypes.CREATE_ENTRY ||
       messageInfo.type === messageTypes.EDIT_ENTRY,
     'messageInfo should be messageTypes.CREATE_ENTRY/EDIT_ENTRY!',
   );
   const date = prettyDate(messageInfo.date);
   let body = ET`created an event in ${thread}`;
   body = ET`${body} scheduled for ${date}: "${messageInfo.text}"`;
   const merged = ET`${prefix} ${body}`;
   return {
     merged,
     title: threadInfo.uiName,
     body,
     prefix,
   };
 }
 
 type NotifTextsForSubthreadCreationInput = {
   +creator: RelativeUserInfo,
   +threadType: ThreadType,
-  +parentThreadInfo: LegacyThreadInfo | ThreadInfo,
+  +parentThreadInfo: ThreadInfo,
   +childThreadName: ?string,
   +childThreadUIName: string | ThreadEntity,
 };
 function notifTextsForSubthreadCreation(
   input: NotifTextsForSubthreadCreationInput,
 ): NotifTexts {
   const {
     creator,
     threadType,
     parentThreadInfo,
     childThreadName,
     childThreadUIName,
   } = input;
 
   const prefix = ET`${ET.user({ userInfo: creator })}`;
 
   let body: string | EntityText = `created a new ${threadNoun(
     threadType,
     parentThreadInfo.id,
   )}`;
   if (parentThreadInfo.name && parentThreadInfo.type !== threadTypes.GENESIS) {
     body = ET`${body} in ${parentThreadInfo.name}`;
   }
 
   let merged = ET`${prefix} ${body}`;
   if (childThreadName) {
     merged = ET`${merged} called "${childThreadName}"`;
   }
 
   return {
     merged,
     body,
     title: childThreadUIName,
     prefix,
   };
 }
 
 type NotifTextsForSidebarCreationInput = {
   +createSidebarMessageInfo: CreateSidebarMessageInfo,
   +sidebarSourceMessageInfo?: ?SidebarSourceMessageInfo,
   +firstSidebarMessageInfo?: ?TextMessageInfo,
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +params: NotificationTextsParams,
 };
 function notifTextsForSidebarCreation(
   input: NotifTextsForSidebarCreationInput,
 ): NotifTexts {
   const {
     sidebarSourceMessageInfo,
     createSidebarMessageInfo,
     firstSidebarMessageInfo,
     threadInfo,
     params,
   } = input;
 
   const creator = ET.user({ userInfo: createSidebarMessageInfo.creator });
   const prefix = ET`${creator}`;
 
   const initialName = createSidebarMessageInfo.initialThreadState.name;
   const sourceMessageAuthorPossessive = ET.user({
     userInfo: createSidebarMessageInfo.sourceMessageAuthor,
     possessive: true,
   });
 
   let body: string | EntityText = 'started a thread in response to';
   body = ET`${body} ${sourceMessageAuthorPossessive} message`;
 
   const { username } = params.notifTargetUserInfo;
 
   if (
     username &&
     sidebarSourceMessageInfo &&
     sidebarSourceMessageInfo.sourceMessage.type === messageTypes.TEXT &&
     isUserMentioned(username, sidebarSourceMessageInfo.sourceMessage.text)
   ) {
     body = ET`${body} that tagged you`;
   } else if (
     username &&
     firstSidebarMessageInfo &&
     isUserMentioned(username, firstSidebarMessageInfo.text)
   ) {
     body = ET`${body} and tagged you`;
   } else if (initialName) {
     body = ET`${body} "${initialName}"`;
   }
 
   return {
     merged: ET`${prefix} ${body}`,
     body,
     title: threadInfo.uiName,
     prefix,
   };
 }
 
 function mostRecentMessageInfoType(
   messageInfos: $ReadOnlyArray<MessageInfo>,
 ): MessageType {
   if (messageInfos.length === 0) {
     throw new Error('expected MessageInfo, but none present!');
   }
   return messageInfos[0].type;
 }
 
 async function fullNotifTextsForMessageInfo(
   messageInfos: $ReadOnlyArray<MessageInfo>,
-  threadInfo: LegacyThreadInfo | ThreadInfo,
-  parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  threadInfo: ThreadInfo,
+  parentThreadInfo: ?ThreadInfo,
   notifTargetUserInfo: UserInfo,
   getENSNames: ?GetENSNames,
 ): Promise<?ResolvedNotifTexts> {
   const mostRecentType = mostRecentMessageInfoType(messageInfos);
   const messageSpec = messageSpecs[mostRecentType];
   invariant(
     messageSpec.notificationTexts,
     `we're not aware of messageType ${mostRecentType}`,
   );
   const unresolvedNotifTexts = await messageSpec.notificationTexts(
     messageInfos,
     threadInfo,
     { notifTargetUserInfo, parentThreadInfo },
   );
   if (!unresolvedNotifTexts) {
     return unresolvedNotifTexts;
   }
 
   const resolveToString = async (
     entityText: string | EntityText,
   ): Promise<string> => {
     if (typeof entityText === 'string') {
       return entityText;
     }
     const notifString = await getEntityTextAsString(entityText, getENSNames, {
       prefixThisThreadNounWith: 'your',
     });
     invariant(
       notifString !== null && notifString !== undefined,
       'getEntityTextAsString only returns falsey when passed falsey',
     );
     return notifString;
   };
   let promises = {
     merged: resolveToString(unresolvedNotifTexts.merged),
     body: resolveToString(unresolvedNotifTexts.body),
     title: resolveToString(ET`${unresolvedNotifTexts.title}`),
   };
   if (unresolvedNotifTexts.prefix) {
     promises = {
       ...promises,
       prefix: resolveToString(unresolvedNotifTexts.prefix),
     };
   }
   return await promiseAll(promises);
 }
 
 function notifRobotextForMessageInfo(
   messageInfo: RobotextMessageInfo,
-  threadInfo: LegacyThreadInfo | ThreadInfo,
-  parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+  threadInfo: ThreadInfo,
+  parentThreadInfo: ?ThreadInfo,
 ): EntityText {
   const robotext = robotextForMessageInfo(
     messageInfo,
     threadInfo,
     parentThreadInfo,
   );
   return robotext.map(entity => {
     if (
       typeof entity !== 'string' &&
       entity.type === 'thread' &&
       entity.id === threadInfo.id
     ) {
       return ET.thread({
         display: 'shortName',
         threadInfo,
         possessive: entity.possessive,
       });
     }
     return entity;
   });
 }
 
 function getNotifCollapseKey(
   rawMessageInfo: RawMessageInfo,
   messageData: MessageData,
 ): ?string {
   const messageSpec = messageSpecs[rawMessageInfo.type];
   return (
     messageSpec.notificationCollapseKey?.(rawMessageInfo, messageData) ?? null
   );
 }
 
 type Unmerged = $ReadOnly<{
   body: string,
   title: string,
   prefix?: string,
   ...
 }>;
 type Merged = {
   body: string,
   title: string,
 };
 function mergePrefixIntoBody(unmerged: Unmerged): Merged {
   const { body, title, prefix } = unmerged;
   const merged = prefix ? `${prefix} ${body}` : body;
   return { body: merged, title };
 }
 
 export {
   notifRobotextForMessageInfo,
   notifTextsForMessageInfo,
   notifTextsForEntryCreationOrEdit,
   notifTextsForSubthreadCreation,
   notifTextsForSidebarCreation,
   getNotifCollapseKey,
   mergePrefixIntoBody,
 };
diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
index ba68b7c02..520aa0b28 100644
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -1,1881 +1,1879 @@
 // @flow
 
 import invariant from 'invariant';
 import _find from 'lodash/fp/find.js';
 import _mapValues from 'lodash/fp/mapValues.js';
 import _omitBy from 'lodash/fp/omitBy.js';
 import * as React from 'react';
 
 import { getUserAvatarForThread } from './avatar-utils.js';
 import { generatePendingThreadColor } from './color-utils.js';
 import { type ParserRules } from './markdown.js';
 import { extractUserMentionsFromText } from './mention-utils.js';
 import { getMessageTitle, isInvalidSidebarSource } from './message-utils.js';
 import { relationshipBlockedInEitherDirection } from './relationship-utils.js';
 import { useForwardLookupSearchText } from './search-utils.js';
 import threadWatcher from './thread-watcher.js';
 import {
   fetchMostRecentMessagesActionTypes,
   useFetchMostRecentMessages,
 } from '../actions/message-actions.js';
 import type { RemoveUsersFromThreadInput } from '../actions/thread-actions';
 import {
   newThreadActionTypes,
   removeUsersFromThreadActionTypes,
 } from '../actions/thread-actions.js';
 import { searchUsers as searchUserCall } from '../actions/user-actions.js';
 import ashoat from '../facts/ashoat.js';
 import genesis from '../facts/genesis.js';
 import { useLoggedInUserInfo } from '../hooks/account-hooks.js';
 import {
   hasPermission,
   permissionsToBitmaskHex,
   threadPermissionsFromBitmaskHex,
 } from '../permissions/minimally-encoded-thread-permissions.js';
 import {
   permissionLookup,
   getAllThreadPermissions,
   makePermissionsBlob,
 } from '../permissions/thread-permissions.js';
 import type {
   ChatThreadItem,
   ChatMessageInfoItem,
 } from '../selectors/chat-selectors.js';
 import { useGlobalThreadSearchIndex } from '../selectors/nav-selectors.js';
 import {
   threadInfoSelector,
   pendingToRealizedThreadIDsSelector,
   threadInfosSelectorForThreadType,
 } from '../selectors/thread-selectors.js';
 import {
   getRelativeMemberInfos,
   usersWithPersonalThreadSelector,
 } from '../selectors/user-selectors.js';
 import type { CalendarQuery } from '../types/entry-types.js';
 import { messageTypes } from '../types/message-types-enum.js';
 import {
   type RobotextMessageInfo,
   type ComposableMessageInfo,
 } from '../types/message-types.js';
 import type {
   RawThreadInfo,
   MinimallyEncodedThreadCurrentUserInfo,
   ThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
 import {
   decodeMinimallyEncodedRoleInfo,
   minimallyEncodeRawThreadInfo,
   minimallyEncodeThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
 import { userRelationshipStatus } from '../types/relationship-types.js';
 import {
   threadPermissionPropagationPrefixes,
   threadPermissions,
   configurableCommunityPermissions,
   type ThreadPermission,
   type ThreadPermissionsInfo,
   type UserSurfacedPermission,
   threadPermissionFilterPrefixes,
 } from '../types/thread-permission-types.js';
 import {
   type ThreadType,
   threadTypes,
   threadTypeIsCommunityRoot,
   assertThreadType,
 } from '../types/thread-types-enum.js';
 import type {
   LegacyRawThreadInfo,
   LegacyThreadInfo,
   MemberInfo,
   ServerThreadInfo,
   ThreadCurrentUserInfo,
   RoleInfo,
   ServerMemberInfo,
   ClientNewThreadRequest,
   NewThreadResult,
   ChangeThreadSettingsPayload,
   UserProfileThreadInfo,
   RelativeMemberInfo,
   MixedRawThreadInfos,
 } from '../types/thread-types.js';
 import { updateTypes } from '../types/update-types-enum.js';
 import { type ClientUpdateInfo } from '../types/update-types.js';
 import type {
   GlobalAccountUserInfo,
   UserInfos,
   AccountUserInfo,
   LoggedInUserInfo,
   UserInfo,
 } from '../types/user-types.js';
 import { useLegacyAshoatKeyserverCall } from '../utils/action-utils.js';
 import type { GetENSNames } from '../utils/ens-helpers.js';
 import {
   ET,
   entityTextToRawString,
   getEntityTextAsString,
   type ThreadEntity,
   type UserEntity,
 } from '../utils/entity-text.js';
 import {
   useDispatchActionPromise,
   type DispatchActionPromise,
 } from '../utils/redux-promise-utils.js';
 import { useSelector } from '../utils/redux-utils.js';
 import { firstLine } from '../utils/string-utils.js';
 import { trimText } from '../utils/text-utils.js';
 import { pendingThreadIDRegex } from '../utils/validation-utils.js';
 
 function threadHasPermission(
   threadInfo: ?(ThreadInfo | LegacyRawThreadInfo | RawThreadInfo),
   permission: ThreadPermission,
 ): boolean {
   if (!threadInfo) {
     return false;
   }
   invariant(
     !permissionsDisabledByBlock.has(permission) || threadInfo?.uiName,
     `${permission} can be disabled by a block, but threadHasPermission can't ` +
       'check for a block on RawThreadInfo. Please pass in ThreadInfo instead!',
   );
   if (threadInfo.minimallyEncoded) {
     return hasPermission(threadInfo.currentUser.permissions, permission);
   }
   return permissionLookup(threadInfo.currentUser.permissions, permission);
 }
 
 function viewerIsMember(
   threadInfo: ?(ThreadInfo | LegacyRawThreadInfo | RawThreadInfo),
 ): boolean {
   return !!(
     threadInfo &&
     threadInfo.currentUser.role !== null &&
     threadInfo.currentUser.role !== undefined
   );
 }
 
 function threadIsInHome(threadInfo: ?(RawThreadInfo | ThreadInfo)): boolean {
   return !!(threadInfo && threadInfo.currentUser.subscription.home);
 }
 
 // Can have messages
 function threadInChatList(
   threadInfo: ?(LegacyRawThreadInfo | RawThreadInfo | ThreadInfo),
 ): boolean {
   return (
     viewerIsMember(threadInfo) &&
     threadHasPermission(threadInfo, threadPermissions.VISIBLE)
   );
 }
 
 function threadIsTopLevel(threadInfo: ?(RawThreadInfo | ThreadInfo)): boolean {
   return threadInChatList(threadInfo) && threadIsChannel(threadInfo);
 }
 
 function threadIsChannel(threadInfo: ?(RawThreadInfo | ThreadInfo)): boolean {
   return !!(threadInfo && threadInfo.type !== threadTypes.SIDEBAR);
 }
 
 function threadIsSidebar(threadInfo: ?(RawThreadInfo | ThreadInfo)): boolean {
   return threadInfo?.type === threadTypes.SIDEBAR;
 }
 
 function threadInBackgroundChatList(
   threadInfo: ?(RawThreadInfo | ThreadInfo),
 ): boolean {
   return threadInChatList(threadInfo) && !threadIsInHome(threadInfo);
 }
 
 function threadInHomeChatList(
   threadInfo: ?(RawThreadInfo | ThreadInfo),
 ): boolean {
   return threadInChatList(threadInfo) && threadIsInHome(threadInfo);
 }
 
 // Can have Calendar entries,
 // does appear as a top-level entity in the thread list
 function threadInFilterList(
   threadInfo: ?(LegacyRawThreadInfo | RawThreadInfo | ThreadInfo),
 ): boolean {
   return (
     threadInChatList(threadInfo) &&
     !!threadInfo &&
     threadInfo.type !== threadTypes.SIDEBAR
   );
 }
 
 function userIsMember(
   threadInfo: ?(LegacyRawThreadInfo | RawThreadInfo | ThreadInfo),
   userID: string,
 ): boolean {
   if (!threadInfo) {
     return false;
   }
   if (threadInfo.id === genesis.id) {
     return true;
   }
   return threadInfo.members.some(member => member.id === userID && member.role);
 }
 
 function threadActualMembers(
   memberInfos: $ReadOnlyArray<MemberInfo | RelativeMemberInfo>,
 ): $ReadOnlyArray<string> {
   return memberInfos
     .filter(memberInfo => memberInfo.role)
     .map(memberInfo => memberInfo.id);
 }
 
 function threadOtherMembers<T: MemberInfo | RelativeMemberInfo>(
   memberInfos: $ReadOnlyArray<T>,
   viewerID: ?string,
 ): $ReadOnlyArray<T> {
   return memberInfos.filter(
     memberInfo => memberInfo.role && memberInfo.id !== viewerID,
   );
 }
 
 function threadMembersWithoutAddedAshoat<
   T: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
 >(threadInfo: T): $PropertyType<T, 'members'> {
   if (threadInfo.community !== genesis.id) {
     return threadInfo.members;
   }
   return threadInfo.members.filter(
     member => member.id !== ashoat.id || member.role,
   );
 }
 
-function threadIsGroupChat(threadInfo: LegacyThreadInfo | ThreadInfo): boolean {
+function threadIsGroupChat(threadInfo: ThreadInfo): boolean {
   return threadInfo.members.length > 2;
 }
 
 function threadOrParentThreadIsGroupChat(
   threadInfo: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
 ) {
   return threadMembersWithoutAddedAshoat(threadInfo).length > 2;
 }
 
 function threadIsPending(threadID: ?string): boolean {
   return !!threadID?.startsWith('pending');
 }
 
 function threadIsPendingSidebar(threadID: ?string): boolean {
   return !!threadID?.startsWith('pending/sidebar/');
 }
 
 function getSingleOtherUser(
   threadInfo: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
   viewerID: ?string,
 ): ?string {
   if (!viewerID) {
     return undefined;
   }
   const otherMembers = threadOtherMembers(threadInfo.members, viewerID);
   if (otherMembers.length !== 1) {
     return undefined;
   }
   return otherMembers[0].id;
 }
 
 function getPendingThreadID(
   threadType: ThreadType,
   memberIDs: $ReadOnlyArray<string>,
   sourceMessageID: ?string,
 ): string {
   const pendingThreadKey = sourceMessageID
     ? `sidebar/${sourceMessageID}`
     : [...memberIDs].sort().join('+');
   const pendingThreadTypeString = sourceMessageID ? '' : `type${threadType}/`;
   return `pending/${pendingThreadTypeString}${pendingThreadKey}`;
 }
 
 type PendingThreadIDContents = {
   +threadType: ThreadType,
   +memberIDs: $ReadOnlyArray<string>,
   +sourceMessageID: ?string,
 };
 
 function parsePendingThreadID(
   pendingThreadID: string,
 ): ?PendingThreadIDContents {
   const pendingRegex = new RegExp(`^${pendingThreadIDRegex}$`);
   const pendingThreadIDMatches = pendingRegex.exec(pendingThreadID);
   if (!pendingThreadIDMatches) {
     return null;
   }
   const [threadTypeString, threadKey] = pendingThreadIDMatches[1].split('/');
   const threadType =
     threadTypeString === 'sidebar'
       ? threadTypes.SIDEBAR
       : assertThreadType(Number(threadTypeString.replace('type', '')));
   const memberIDs = threadTypeString === 'sidebar' ? [] : threadKey.split('+');
   const sourceMessageID = threadTypeString === 'sidebar' ? threadKey : null;
   return {
     threadType,
     memberIDs,
     sourceMessageID,
   };
 }
 
 type UserIDAndUsername = {
   +id: string,
   +username: string,
   ...
 };
 type CreatePendingThreadArgs = {
   +viewerID: string,
   +threadType: ThreadType,
   +members: $ReadOnlyArray<UserIDAndUsername>,
-  +parentThreadInfo?: ?(LegacyThreadInfo | ThreadInfo),
+  +parentThreadInfo?: ?ThreadInfo,
   +threadColor?: ?string,
   +name?: ?string,
   +sourceMessageID?: string,
 };
 
 function createPendingThread({
   viewerID,
   threadType,
   members,
   parentThreadInfo,
   threadColor,
   name,
   sourceMessageID,
 }: CreatePendingThreadArgs): ThreadInfo {
   const now = Date.now();
   if (!members.some(member => member.id === viewerID)) {
     throw new Error(
       'createPendingThread should be called with the viewer as a member',
     );
   }
 
   const memberIDs = members.map(member => member.id);
   const threadID = getPendingThreadID(threadType, memberIDs, sourceMessageID);
 
   const permissions = {
     [threadPermissions.KNOW_OF]: true,
     [threadPermissions.VISIBLE]: true,
     [threadPermissions.VOICED]: true,
   };
 
   const membershipPermissions = getAllThreadPermissions(
     makePermissionsBlob(permissions, null, threadID, threadType),
     threadID,
   );
   const role = {
     id: `${threadID}/role`,
     name: 'Members',
     permissions,
     isDefault: true,
   };
 
   const rawThreadInfo = {
     id: threadID,
     type: threadType,
     name: name ?? null,
     description: null,
     color: threadColor ?? generatePendingThreadColor(memberIDs),
     creationTime: now,
     parentThreadID: parentThreadInfo?.id ?? null,
     containingThreadID: getContainingThreadID(parentThreadInfo, threadType),
     community: getCommunity(parentThreadInfo),
     members: members.map(member => ({
       id: member.id,
       role: role.id,
       permissions: membershipPermissions,
       isSender: false,
     })),
     roles: {
       [role.id]: role,
     },
     currentUser: {
       role: role.id,
       permissions: membershipPermissions,
       subscription: {
         pushNotifs: false,
         home: false,
       },
       unread: false,
     },
     repliesCount: 0,
     sourceMessageID,
     pinnedCount: 0,
   };
 
   const userInfos: { [string]: UserInfo } = {};
   for (const member of members) {
     const { id, username } = member;
     userInfos[id] = { id, username };
   }
 
   return threadInfoFromRawThreadInfo(rawThreadInfo, viewerID, userInfos);
 }
 
 type PendingPersonalThread = {
   +threadInfo: ThreadInfo,
   +pendingPersonalThreadUserInfo: UserInfo,
 };
 
 function createPendingPersonalThread(
   loggedInUserInfo: LoggedInUserInfo,
   userID: string,
   username: string,
 ): PendingPersonalThread {
   const pendingPersonalThreadUserInfo = {
     id: userID,
     username: username,
   };
 
   const threadInfo = createPendingThread({
     viewerID: loggedInUserInfo.id,
     threadType: threadTypes.PERSONAL,
     members: [loggedInUserInfo, pendingPersonalThreadUserInfo],
   });
 
   return { threadInfo, pendingPersonalThreadUserInfo };
 }
 
 function createPendingThreadItem(
   loggedInUserInfo: LoggedInUserInfo,
   user: UserIDAndUsername,
 ): ChatThreadItem {
   const { threadInfo, pendingPersonalThreadUserInfo } =
     createPendingPersonalThread(loggedInUserInfo, user.id, user.username);
 
   return {
     type: 'chatThreadItem',
     threadInfo,
     mostRecentMessageInfo: null,
     mostRecentNonLocalMessage: null,
     lastUpdatedTime: threadInfo.creationTime,
     lastUpdatedTimeIncludingSidebars: threadInfo.creationTime,
     sidebars: [],
     pendingPersonalThreadUserInfo,
   };
 }
 
 // Returns map from lowercase username to AccountUserInfo
 function memberLowercaseUsernameMap(
   members: $ReadOnlyArray<RelativeMemberInfo>,
 ): Map<string, AccountUserInfo> {
   const memberMap = new Map<string, AccountUserInfo>();
   for (const member of members) {
     const { id, role, username } = member;
     if (!role || !username) {
       continue;
     }
     memberMap.set(username.toLowerCase(), { id, username });
   }
   return memberMap;
 }
 
 // Returns map from user ID to AccountUserInfo
 function extractMentionedMembers(
   text: string,
-  threadInfo: LegacyThreadInfo | ThreadInfo,
+  threadInfo: ThreadInfo,
 ): Map<string, AccountUserInfo> {
   const memberMap = memberLowercaseUsernameMap(threadInfo.members);
   const mentions = extractUserMentionsFromText(text);
 
   const mentionedMembers = new Map<string, AccountUserInfo>();
   for (const mention of mentions) {
     const userInfo = memberMap.get(mention.toLowerCase());
     if (userInfo) {
       mentionedMembers.set(userInfo.id, userInfo);
     }
   }
   return mentionedMembers;
 }
 
 // When a member of the parent is mentioned in a sidebar,
 // they will be automatically added to that sidebar
 function extractNewMentionedParentMembers(
   messageText: string,
-  threadInfo: LegacyThreadInfo | ThreadInfo,
-  parentThreadInfo: LegacyThreadInfo | ThreadInfo,
+  threadInfo: ThreadInfo,
+  parentThreadInfo: ThreadInfo,
 ): AccountUserInfo[] {
   const mentionedMembersOfParent = extractMentionedMembers(
     messageText,
     parentThreadInfo,
   );
   for (const member of threadInfo.members) {
     if (member.role) {
       mentionedMembersOfParent.delete(member.id);
     }
   }
   return [...mentionedMembersOfParent.values()];
 }
 
 type SharedCreatePendingSidebarInput = {
   +sourceMessageInfo: ComposableMessageInfo | RobotextMessageInfo,
   +parentThreadInfo: ThreadInfo,
   +loggedInUserInfo: LoggedInUserInfo,
 };
 
 type BaseCreatePendingSidebarInput = {
   ...SharedCreatePendingSidebarInput,
   +messageTitle: string,
 };
 function baseCreatePendingSidebar(
   input: BaseCreatePendingSidebarInput,
 ): ThreadInfo {
   const {
     sourceMessageInfo,
     parentThreadInfo,
     loggedInUserInfo,
     messageTitle,
   } = input;
   const { color, type: parentThreadType } = parentThreadInfo;
   const threadName = trimText(messageTitle, 30);
 
   const initialMembers = new Map<string, UserIDAndUsername>();
 
   const { id: viewerID, username: viewerUsername } = loggedInUserInfo;
   initialMembers.set(viewerID, { id: viewerID, username: viewerUsername });
 
   if (userIsMember(parentThreadInfo, sourceMessageInfo.creator.id)) {
     const { id: sourceAuthorID, username: sourceAuthorUsername } =
       sourceMessageInfo.creator;
     invariant(
       sourceAuthorUsername,
       'sourceAuthorUsername should be set in createPendingSidebar',
     );
     const initialMemberUserInfo = {
       id: sourceAuthorID,
       username: sourceAuthorUsername,
     };
     initialMembers.set(sourceAuthorID, initialMemberUserInfo);
   }
 
   const singleOtherUser = getSingleOtherUser(parentThreadInfo, viewerID);
   if (parentThreadType === threadTypes.PERSONAL && singleOtherUser) {
     const singleOtherUsername = parentThreadInfo.members.find(
       member => member.id === singleOtherUser,
     )?.username;
     invariant(
       singleOtherUsername,
       'singleOtherUsername should be set in createPendingSidebar',
     );
     const singleOtherUserInfo = {
       id: singleOtherUser,
       username: singleOtherUsername,
     };
     initialMembers.set(singleOtherUser, singleOtherUserInfo);
   }
 
   if (sourceMessageInfo.type === messageTypes.TEXT) {
     const mentionedMembersOfParent = extractMentionedMembers(
       sourceMessageInfo.text,
       parentThreadInfo,
     );
     for (const [memberID, member] of mentionedMembersOfParent) {
       initialMembers.set(memberID, member);
     }
   }
 
   return createPendingThread({
     viewerID,
     threadType: threadTypes.SIDEBAR,
     members: [...initialMembers.values()],
     parentThreadInfo,
     threadColor: color,
     name: threadName,
     sourceMessageID: sourceMessageInfo.id,
   });
 }
 
 // The message title here may have ETH addresses that aren't resolved to ENS
 // names. This function should only be used in cases where we're sure that we
 // don't care about the thread title. We should prefer createPendingSidebar
 // wherever possible
 type CreateUnresolvedPendingSidebarInput = {
   ...SharedCreatePendingSidebarInput,
   +markdownRules: ParserRules,
 };
 function createUnresolvedPendingSidebar(
   input: CreateUnresolvedPendingSidebarInput,
 ): ThreadInfo {
   const {
     sourceMessageInfo,
     parentThreadInfo,
     loggedInUserInfo,
     markdownRules,
   } = input;
 
   const messageTitleEntityText = getMessageTitle(
     sourceMessageInfo,
     parentThreadInfo,
     parentThreadInfo,
     markdownRules,
   );
   const messageTitle = entityTextToRawString(messageTitleEntityText, {
     ignoreViewer: true,
   });
 
   return baseCreatePendingSidebar({
     sourceMessageInfo,
     parentThreadInfo,
     messageTitle,
     loggedInUserInfo,
   });
 }
 
 type CreatePendingSidebarInput = {
   ...SharedCreatePendingSidebarInput,
   +markdownRules: ParserRules,
   +getENSNames: ?GetENSNames,
 };
 async function createPendingSidebar(
   input: CreatePendingSidebarInput,
 ): Promise<ThreadInfo> {
   const {
     sourceMessageInfo,
     parentThreadInfo,
     loggedInUserInfo,
     markdownRules,
     getENSNames,
   } = input;
 
   const messageTitleEntityText = getMessageTitle(
     sourceMessageInfo,
     parentThreadInfo,
     parentThreadInfo,
     markdownRules,
   );
   const messageTitle = await getEntityTextAsString(
     messageTitleEntityText,
     getENSNames,
     { ignoreViewer: true },
   );
   invariant(
     messageTitle !== null && messageTitle !== undefined,
     'getEntityTextAsString only returns falsey when passed falsey',
   );
 
   return baseCreatePendingSidebar({
     sourceMessageInfo,
     parentThreadInfo,
     messageTitle,
     loggedInUserInfo,
   });
 }
 
 function pendingThreadType(numberOfOtherMembers: number): 4 | 6 | 7 {
   if (numberOfOtherMembers === 0) {
     return threadTypes.PRIVATE;
   } else if (numberOfOtherMembers === 1) {
     return threadTypes.PERSONAL;
   } else {
     return threadTypes.LOCAL;
   }
 }
 
 function threadTypeCanBePending(threadType: ThreadType): boolean {
   return (
     threadType === threadTypes.PERSONAL ||
     threadType === threadTypes.LOCAL ||
     threadType === threadTypes.SIDEBAR ||
     threadType === threadTypes.PRIVATE
   );
 }
 
 type CreateRealThreadParameters = {
-  +threadInfo: LegacyThreadInfo | ThreadInfo,
+  +threadInfo: ThreadInfo,
   +dispatchActionPromise: DispatchActionPromise,
   +createNewThread: ClientNewThreadRequest => Promise<NewThreadResult>,
   +sourceMessageID: ?string,
   +viewerID: ?string,
   +handleError?: () => mixed,
   +calendarQuery: CalendarQuery,
 };
 async function createRealThreadFromPendingThread({
   threadInfo,
   dispatchActionPromise,
   createNewThread,
   sourceMessageID,
   viewerID,
   calendarQuery,
 }: CreateRealThreadParameters): Promise<string> {
   if (!threadIsPending(threadInfo.id)) {
     return threadInfo.id;
   }
 
   const otherMemberIDs = threadOtherMembers(threadInfo.members, viewerID).map(
     member => member.id,
   );
   let resultPromise;
   if (threadInfo.type !== threadTypes.SIDEBAR) {
     invariant(
       otherMemberIDs.length > 0,
       'otherMemberIDs should not be empty for threads',
     );
     resultPromise = createNewThread({
       type: pendingThreadType(otherMemberIDs.length),
       initialMemberIDs: otherMemberIDs,
       color: threadInfo.color,
       calendarQuery,
     });
   } else {
     invariant(
       sourceMessageID,
       'sourceMessageID should be set when creating a sidebar',
     );
     resultPromise = createNewThread({
       type: threadTypes.SIDEBAR,
       initialMemberIDs: otherMemberIDs,
       color: threadInfo.color,
       sourceMessageID,
       parentThreadID: threadInfo.parentThreadID,
       name: threadInfo.name,
       calendarQuery,
     });
   }
   void dispatchActionPromise(newThreadActionTypes, resultPromise);
   const { newThreadID } = await resultPromise;
   return newThreadID;
 }
 
 type RawThreadInfoOptions = {
   +filterThreadEditAvatarPermission?: boolean,
   +excludePinInfo?: boolean,
   +filterManageInviteLinksPermission?: boolean,
   +filterVoicedInAnnouncementChannelsPermission?: boolean,
   +minimallyEncodePermissions?: boolean,
 };
 function rawThreadInfoFromServerThreadInfo(
   serverThreadInfo: ServerThreadInfo,
   viewerID: string,
   options?: RawThreadInfoOptions,
 ): ?LegacyRawThreadInfo | ?RawThreadInfo {
   const filterThreadEditAvatarPermission =
     options?.filterThreadEditAvatarPermission;
   const excludePinInfo = options?.excludePinInfo;
   const filterManageInviteLinksPermission =
     options?.filterManageInviteLinksPermission;
   const filterVoicedInAnnouncementChannelsPermission =
     options?.filterVoicedInAnnouncementChannelsPermission;
   const shouldMinimallyEncodePermissions = options?.minimallyEncodePermissions;
 
   const filterThreadPermissions = _omitBy(
     (v, k) =>
       (filterThreadEditAvatarPermission &&
         [
           threadPermissions.EDIT_THREAD_AVATAR,
           threadPermissionPropagationPrefixes.DESCENDANT +
             threadPermissions.EDIT_THREAD_AVATAR,
         ].includes(k)) ||
       (excludePinInfo &&
         [
           threadPermissions.MANAGE_PINS,
           threadPermissionPropagationPrefixes.DESCENDANT +
             threadPermissions.MANAGE_PINS,
         ].includes(k)) ||
       (filterManageInviteLinksPermission &&
         [threadPermissions.MANAGE_INVITE_LINKS].includes(k)) ||
       (filterVoicedInAnnouncementChannelsPermission &&
         [
           threadPermissions.VOICED_IN_ANNOUNCEMENT_CHANNELS,
           threadPermissionPropagationPrefixes.DESCENDANT +
             threadPermissionFilterPrefixes.TOP_LEVEL +
             threadPermissions.VOICED_IN_ANNOUNCEMENT_CHANNELS,
         ].includes(k)),
   );
 
   const members = [];
   let currentUser;
   for (const serverMember of serverThreadInfo.members) {
     if (
       serverThreadInfo.id === genesis.id &&
       serverMember.id !== viewerID &&
       serverMember.id !== ashoat.id
     ) {
       continue;
     }
 
     const memberPermissions = filterThreadPermissions(serverMember.permissions);
 
     members.push({
       id: serverMember.id,
       role: serverMember.role,
       permissions: memberPermissions,
       isSender: serverMember.isSender,
     });
     if (serverMember.id === viewerID) {
       currentUser = {
         role: serverMember.role,
         permissions: memberPermissions,
         subscription: serverMember.subscription,
         unread: serverMember.unread,
       };
     }
   }
 
   let currentUserPermissions;
   if (currentUser) {
     currentUserPermissions = currentUser.permissions;
   } else {
     currentUserPermissions = filterThreadPermissions(
       getAllThreadPermissions(null, serverThreadInfo.id),
     );
     currentUser = {
       role: null,
       permissions: currentUserPermissions,
       subscription: {
         home: false,
         pushNotifs: false,
       },
       unread: null,
     };
   }
   if (!permissionLookup(currentUserPermissions, threadPermissions.KNOW_OF)) {
     return null;
   }
 
   const rolesWithFilteredThreadPermissions = _mapValues(role => ({
     ...role,
     permissions: filterThreadPermissions(role.permissions),
   }))(serverThreadInfo.roles);
 
   let rawThreadInfo: any = {
     id: serverThreadInfo.id,
     type: serverThreadInfo.type,
     name: serverThreadInfo.name,
     description: serverThreadInfo.description,
     color: serverThreadInfo.color,
     creationTime: serverThreadInfo.creationTime,
     parentThreadID: serverThreadInfo.parentThreadID,
     members,
     roles: rolesWithFilteredThreadPermissions,
     currentUser,
     repliesCount: serverThreadInfo.repliesCount,
     containingThreadID: serverThreadInfo.containingThreadID,
     community: serverThreadInfo.community,
   };
   const sourceMessageID = serverThreadInfo.sourceMessageID;
   if (sourceMessageID) {
     rawThreadInfo = { ...rawThreadInfo, sourceMessageID };
   }
   if (serverThreadInfo.avatar) {
     rawThreadInfo = { ...rawThreadInfo, avatar: serverThreadInfo.avatar };
   }
   if (!excludePinInfo) {
     rawThreadInfo = {
       ...rawThreadInfo,
       pinnedCount: serverThreadInfo.pinnedCount,
     };
   }
   return shouldMinimallyEncodePermissions
     ? minimallyEncodeRawThreadInfo(rawThreadInfo)
     : rawThreadInfo;
 }
 
 function threadUIName(threadInfo: ThreadInfo): string | ThreadEntity {
   if (threadInfo.name) {
     return firstLine(threadInfo.name);
   }
 
   const threadMembers: $ReadOnlyArray<RelativeMemberInfo> =
     threadInfo.members.filter(memberInfo => memberInfo.role);
   const memberEntities: $ReadOnlyArray<UserEntity> = threadMembers.map(member =>
     ET.user({ userInfo: member }),
   );
 
   return {
     type: 'thread',
     id: threadInfo.id,
     name: threadInfo.name,
     display: 'uiName',
     uiName: memberEntities,
     ifJustViewer:
       threadInfo.type === threadTypes.PRIVATE
         ? 'viewer_username'
         : 'just_you_string',
   };
 }
 
 function threadInfoFromRawThreadInfo(
   rawThreadInfo: LegacyRawThreadInfo | RawThreadInfo,
   viewerID: ?string,
   userInfos: UserInfos,
 ): ThreadInfo {
   let threadInfo: LegacyThreadInfo | ThreadInfo;
   if (rawThreadInfo.minimallyEncoded) {
     threadInfo = {
       minimallyEncoded: true,
       id: rawThreadInfo.id,
       type: rawThreadInfo.type,
       name: rawThreadInfo.name,
       uiName: '',
       description: rawThreadInfo.description,
       color: rawThreadInfo.color,
       creationTime: rawThreadInfo.creationTime,
       parentThreadID: rawThreadInfo.parentThreadID,
       containingThreadID: rawThreadInfo.containingThreadID,
       community: rawThreadInfo.community,
       members: getRelativeMemberInfos(rawThreadInfo, viewerID, userInfos),
       roles: rawThreadInfo.roles,
       currentUser: getMinimallyEncodedCurrentUser(
         rawThreadInfo,
         viewerID,
         userInfos,
       ),
       repliesCount: rawThreadInfo.repliesCount,
     };
   } else {
     threadInfo = {
       id: rawThreadInfo.id,
       type: rawThreadInfo.type,
       name: rawThreadInfo.name,
       uiName: '',
       description: rawThreadInfo.description,
       color: rawThreadInfo.color,
       creationTime: rawThreadInfo.creationTime,
       parentThreadID: rawThreadInfo.parentThreadID,
       containingThreadID: rawThreadInfo.containingThreadID,
       community: rawThreadInfo.community,
       members: getRelativeMemberInfos(rawThreadInfo, viewerID, userInfos),
       roles: rawThreadInfo.roles,
       currentUser: getCurrentUser(rawThreadInfo, viewerID, userInfos),
       repliesCount: rawThreadInfo.repliesCount,
     };
     threadInfo = minimallyEncodeThreadInfo(threadInfo);
   }
 
   threadInfo = {
     ...threadInfo,
     uiName: threadUIName(threadInfo),
   };
   const { sourceMessageID, avatar, pinnedCount } = rawThreadInfo;
   if (sourceMessageID) {
     threadInfo = { ...threadInfo, sourceMessageID };
   }
 
   if (avatar) {
     threadInfo = { ...threadInfo, avatar };
   } else if (
     rawThreadInfo.type === threadTypes.PERSONAL ||
     rawThreadInfo.type === threadTypes.PRIVATE
   ) {
     threadInfo = {
       ...threadInfo,
       avatar: getUserAvatarForThread(rawThreadInfo, viewerID, userInfos),
     };
   }
 
   if (pinnedCount) {
     threadInfo = { ...threadInfo, pinnedCount };
   }
   return threadInfo;
 }
 
 function getCurrentUser(
   threadInfo: LegacyRawThreadInfo,
   viewerID: ?string,
   userInfos: UserInfos,
 ): ThreadCurrentUserInfo {
   if (!threadFrozenDueToBlock(threadInfo, viewerID, userInfos)) {
     return threadInfo.currentUser;
   }
 
   return {
     ...threadInfo.currentUser,
     permissions: {
       ...threadInfo.currentUser.permissions,
       ...disabledPermissions,
     },
   };
 }
 
 function getMinimallyEncodedCurrentUser(
   threadInfo: RawThreadInfo | ThreadInfo,
   viewerID: ?string,
   userInfos: UserInfos,
 ): MinimallyEncodedThreadCurrentUserInfo {
   if (!threadFrozenDueToBlock(threadInfo, viewerID, userInfos)) {
     return threadInfo.currentUser;
   }
   const decodedPermissions = threadPermissionsFromBitmaskHex(
     threadInfo.currentUser.permissions,
   );
   const updatedPermissions = {
     ...decodedPermissions,
     ...disabledPermissions,
   };
   const encodedUpdatedPermissions = permissionsToBitmaskHex(updatedPermissions);
   return {
     ...threadInfo.currentUser,
     permissions: encodedUpdatedPermissions,
   };
 }
 
 function threadIsWithBlockedUserOnly(
   threadInfo: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
   viewerID: ?string,
   userInfos: UserInfos,
   checkOnlyViewerBlock?: boolean,
 ): boolean {
   if (
     threadOrParentThreadIsGroupChat(threadInfo) ||
     threadOrParentThreadHasAdminRole(threadInfo)
   ) {
     return false;
   }
 
   const otherUserID = getSingleOtherUser(threadInfo, viewerID);
   if (!otherUserID) {
     return false;
   }
   const otherUserRelationshipStatus =
     userInfos[otherUserID]?.relationshipStatus;
 
   if (checkOnlyViewerBlock) {
     return (
       otherUserRelationshipStatus === userRelationshipStatus.BLOCKED_BY_VIEWER
     );
   }
 
   return (
     !!otherUserRelationshipStatus &&
     relationshipBlockedInEitherDirection(otherUserRelationshipStatus)
   );
 }
 
 function threadFrozenDueToBlock(
   threadInfo: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
   viewerID: ?string,
   userInfos: UserInfos,
 ): boolean {
   return threadIsWithBlockedUserOnly(threadInfo, viewerID, userInfos);
 }
 
 function threadFrozenDueToViewerBlock(
   threadInfo: RawThreadInfo | ThreadInfo,
   viewerID: ?string,
   userInfos: UserInfos,
 ): boolean {
   return threadIsWithBlockedUserOnly(threadInfo, viewerID, userInfos, true);
 }
 
 const threadTypeDescriptions: { [ThreadType]: string } = {
   [threadTypes.COMMUNITY_OPEN_SUBTHREAD]:
     'Anybody in the parent channel can see an open subchannel.',
   [threadTypes.COMMUNITY_SECRET_SUBTHREAD]:
     'Only visible to its members and admins of ancestor channels.',
 };
 
 function memberIsAdmin(
   memberInfo: RelativeMemberInfo | MemberInfo,
   threadInfo: RawThreadInfo | ThreadInfo,
 ): boolean {
   return !!(
     memberInfo.role && roleIsAdminRole(threadInfo.roles[memberInfo.role])
   );
 }
 
 // Since we don't have access to all of the ancestor ThreadInfos, we approximate
 // "parent admin" as anybody with CHANGE_ROLE permissions.
 function memberHasAdminPowers(
   memberInfo: RelativeMemberInfo | MemberInfo | ServerMemberInfo,
 ): boolean {
   if (memberInfo.minimallyEncoded) {
     return hasPermission(memberInfo.permissions, threadPermissions.CHANGE_ROLE);
   }
   return !!memberInfo.permissions[threadPermissions.CHANGE_ROLE]?.value;
 }
 
 function roleIsAdminRole(roleInfo: ?RoleInfo): boolean {
   return !!(roleInfo && !roleInfo.isDefault && roleInfo.name === 'Admins');
 }
 
 function threadHasAdminRole(
   threadInfo: ?(
     | LegacyRawThreadInfo
     | RawThreadInfo
     | ThreadInfo
     | ServerThreadInfo
   ),
 ): boolean {
   if (!threadInfo) {
     return false;
   }
   return !!_find({ name: 'Admins' })(threadInfo.roles);
 }
 
 function threadOrParentThreadHasAdminRole(
   threadInfo: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
 ) {
   return (
     threadMembersWithoutAddedAshoat(threadInfo).filter(member =>
       memberHasAdminPowers(member),
     ).length > 0
   );
 }
 
 function identifyInvalidatedThreads(
   updateInfos: $ReadOnlyArray<ClientUpdateInfo>,
 ): Set<string> {
   const invalidated = new Set<string>();
   for (const updateInfo of updateInfos) {
     if (updateInfo.type === updateTypes.DELETE_THREAD) {
       invalidated.add(updateInfo.threadID);
     }
   }
   return invalidated;
 }
 
 const permissionsDisabledByBlockArray = [
   threadPermissions.VOICED,
   threadPermissions.EDIT_ENTRIES,
   threadPermissions.EDIT_THREAD_NAME,
   threadPermissions.EDIT_THREAD_COLOR,
   threadPermissions.EDIT_THREAD_DESCRIPTION,
   threadPermissions.CREATE_SUBCHANNELS,
   threadPermissions.CREATE_SIDEBARS,
   threadPermissions.JOIN_THREAD,
   threadPermissions.EDIT_PERMISSIONS,
   threadPermissions.ADD_MEMBERS,
   threadPermissions.REMOVE_MEMBERS,
 ];
 
 const permissionsDisabledByBlock: Set<ThreadPermission> = new Set(
   permissionsDisabledByBlockArray,
 );
 
 const disabledPermissions: ThreadPermissionsInfo =
   permissionsDisabledByBlockArray.reduce(
     (permissions: ThreadPermissionsInfo, permission: string) => ({
       ...permissions,
       [permission]: { value: false, source: null },
     }),
     {},
   );
 
 // Consider updating itemHeight in native/chat/chat-thread-list.react.js
 // if you change this
 const emptyItemText: string =
   `Background chats are just like normal chats, except they don't ` +
   `contribute to your unread count.\n\n` +
   `To move a chat over here, switch the “Background” option in its settings.`;
 
 function threadNoun(threadType: ThreadType, parentThreadID: ?string): string {
   if (threadType === threadTypes.SIDEBAR) {
     return 'thread';
   } else if (
     threadType === threadTypes.COMMUNITY_SECRET_SUBTHREAD &&
     parentThreadID === genesis.id
   ) {
     return 'chat';
   } else if (
     threadType === threadTypes.COMMUNITY_ROOT ||
     threadType === threadTypes.COMMUNITY_ANNOUNCEMENT_ROOT ||
     threadType === threadTypes.COMMUNITY_OPEN_SUBTHREAD ||
     threadType === threadTypes.COMMUNITY_OPEN_ANNOUNCEMENT_SUBTHREAD ||
     threadType === threadTypes.COMMUNITY_SECRET_SUBTHREAD ||
     threadType === threadTypes.COMMUNITY_SECRET_ANNOUNCEMENT_SUBTHREAD ||
     threadType === threadTypes.GENESIS
   ) {
     return 'channel';
   } else {
     return 'chat';
   }
 }
 
 function threadLabel(threadType: ThreadType): string {
   if (
     threadType === threadTypes.COMMUNITY_OPEN_SUBTHREAD ||
     threadType === threadTypes.COMMUNITY_OPEN_ANNOUNCEMENT_SUBTHREAD
   ) {
     return 'Open';
   } else if (threadType === threadTypes.PERSONAL) {
     return 'Personal';
   } else if (threadType === threadTypes.SIDEBAR) {
     return 'Thread';
   } else if (threadType === threadTypes.PRIVATE) {
     return 'Private';
   } else if (
     threadType === threadTypes.COMMUNITY_ROOT ||
     threadType === threadTypes.COMMUNITY_ANNOUNCEMENT_ROOT ||
     threadType === threadTypes.GENESIS
   ) {
     return 'Community';
   } else {
     return 'Secret';
   }
 }
 
 function useWatchThread(threadInfo: ?ThreadInfo) {
   const dispatchActionPromise = useDispatchActionPromise();
   const callFetchMostRecentMessages = useFetchMostRecentMessages();
 
   const threadID = threadInfo?.id;
   const threadNotInChatList = !threadInChatList(threadInfo);
   React.useEffect(() => {
     if (threadID && threadNotInChatList) {
       threadWatcher.watchID(threadID);
       void dispatchActionPromise(
         fetchMostRecentMessagesActionTypes,
         callFetchMostRecentMessages({ threadID }),
       );
     }
     return () => {
       if (threadID && threadNotInChatList) {
         threadWatcher.removeID(threadID);
       }
     };
   }, [
     callFetchMostRecentMessages,
     dispatchActionPromise,
     threadNotInChatList,
     threadID,
   ]);
 }
 
 type ExistingThreadInfoFinderParams = {
   +searching: boolean,
   +userInfoInputArray: $ReadOnlyArray<AccountUserInfo>,
 };
 type ExistingThreadInfoFinder = (
   params: ExistingThreadInfoFinderParams,
 ) => ?ThreadInfo;
 function useExistingThreadInfoFinder(
   baseThreadInfo: ?ThreadInfo,
 ): ExistingThreadInfoFinder {
   const threadInfos = useSelector(threadInfoSelector);
   const loggedInUserInfo = useLoggedInUserInfo();
   const userInfos = useSelector(state => state.userStore.userInfos);
 
   const pendingToRealizedThreadIDs = useSelector(state =>
     pendingToRealizedThreadIDsSelector(state.threadStore.threadInfos),
   );
   return React.useCallback(
     (params: ExistingThreadInfoFinderParams): ?ThreadInfo => {
       if (!baseThreadInfo) {
         return null;
       }
 
       const realizedThreadInfo = threadInfos[baseThreadInfo.id];
       if (realizedThreadInfo) {
         return realizedThreadInfo;
       }
 
       if (!loggedInUserInfo || !threadIsPending(baseThreadInfo.id)) {
         return baseThreadInfo;
       }
       const viewerID = loggedInUserInfo?.id;
 
       invariant(
         threadTypeCanBePending(baseThreadInfo.type),
         `ThreadInfo has pending ID ${baseThreadInfo.id}, but type that ` +
           `should not be pending ${baseThreadInfo.type}`,
       );
 
       const { searching, userInfoInputArray } = params;
 
       const { sourceMessageID } = baseThreadInfo;
       const pendingThreadID = searching
         ? getPendingThreadID(
             pendingThreadType(userInfoInputArray.length),
             [...userInfoInputArray.map(user => user.id), viewerID],
             sourceMessageID,
           )
         : getPendingThreadID(
             baseThreadInfo.type,
             baseThreadInfo.members.map(member => member.id),
             sourceMessageID,
           );
 
       const realizedThreadID = pendingToRealizedThreadIDs.get(pendingThreadID);
       if (realizedThreadID && threadInfos[realizedThreadID]) {
         return threadInfos[realizedThreadID];
       }
 
       const updatedThread = searching
         ? createPendingThread({
             viewerID,
             threadType: pendingThreadType(userInfoInputArray.length),
             members: [loggedInUserInfo, ...userInfoInputArray],
           })
         : baseThreadInfo;
 
       return {
         ...updatedThread,
         currentUser: getMinimallyEncodedCurrentUser(
           updatedThread,
           viewerID,
           userInfos,
         ),
       };
     },
     [
       baseThreadInfo,
       threadInfos,
       loggedInUserInfo,
       pendingToRealizedThreadIDs,
       userInfos,
     ],
   );
 }
 
 type ThreadTypeParentRequirement = 'optional' | 'required' | 'disabled';
 function getThreadTypeParentRequirement(
   threadType: ThreadType,
 ): ThreadTypeParentRequirement {
   if (
     threadType === threadTypes.COMMUNITY_OPEN_SUBTHREAD ||
     threadType === threadTypes.COMMUNITY_OPEN_ANNOUNCEMENT_SUBTHREAD ||
     //threadType === threadTypes.COMMUNITY_SECRET_SUBTHREAD ||
     threadType === threadTypes.COMMUNITY_SECRET_ANNOUNCEMENT_SUBTHREAD ||
     threadType === threadTypes.SIDEBAR
   ) {
     return 'required';
   } else if (
     threadType === threadTypes.COMMUNITY_ROOT ||
     threadType === threadTypes.COMMUNITY_ANNOUNCEMENT_ROOT ||
     threadType === threadTypes.GENESIS ||
     threadType === threadTypes.PERSONAL ||
     threadType === threadTypes.PRIVATE
   ) {
     return 'disabled';
   } else {
     return 'optional';
   }
 }
 
 function threadMemberHasPermission(
   threadInfo:
     | ServerThreadInfo
     | LegacyRawThreadInfo
     | RawThreadInfo
     | ThreadInfo,
   memberID: string,
   permission: ThreadPermission,
 ): boolean {
   for (const member of threadInfo.members) {
     if (member.id !== memberID) {
       continue;
     }
     if (member.minimallyEncoded) {
       return hasPermission(member.permissions, permission);
     }
     return permissionLookup(member.permissions, permission);
   }
   return false;
 }
 
 function useCanCreateSidebarFromMessage(
   threadInfo: ThreadInfo,
   messageInfo: ComposableMessageInfo | RobotextMessageInfo,
 ): boolean {
   const messageCreatorUserInfo = useSelector(
     state => state.userStore.userInfos[messageInfo.creator.id],
   );
 
   if (
     !messageInfo.id ||
     threadInfo.sourceMessageID === messageInfo.id ||
     isInvalidSidebarSource(messageInfo)
   ) {
     return false;
   }
 
   const messageCreatorRelationship = messageCreatorUserInfo?.relationshipStatus;
   const creatorRelationshipHasBlock =
     messageCreatorRelationship &&
     relationshipBlockedInEitherDirection(messageCreatorRelationship);
 
   const hasCreateSidebarsPermission = threadHasPermission(
     threadInfo,
     threadPermissions.CREATE_SIDEBARS,
   );
 
   return hasCreateSidebarsPermission && !creatorRelationshipHasBlock;
 }
 
 function useSidebarExistsOrCanBeCreated(
   threadInfo: ThreadInfo,
   messageItem: ChatMessageInfoItem,
 ): boolean {
   const canCreateSidebarFromMessage = useCanCreateSidebarFromMessage(
     threadInfo,
     messageItem.messageInfo,
   );
   return !!messageItem.threadCreatedFromMessage || canCreateSidebarFromMessage;
 }
 
 function checkIfDefaultMembersAreVoiced(threadInfo: ThreadInfo): boolean {
   const defaultRoleID = Object.keys(threadInfo.roles).find(
     roleID => threadInfo.roles[roleID].isDefault,
   );
   invariant(
     defaultRoleID !== undefined,
     'all threads should have a default role',
   );
   const defaultRole = threadInfo.roles[defaultRoleID];
   const defaultRolePermissions = defaultRole.minimallyEncoded
     ? decodeMinimallyEncodedRoleInfo(defaultRole).permissions
     : defaultRole.permissions;
 
   return !!defaultRolePermissions[threadPermissions.VOICED];
 }
 
 const draftKeySuffix = '/message_composer';
 
 function draftKeyFromThreadID(threadID: string): string {
   return `${threadID}${draftKeySuffix}`;
 }
 
 function getContainingThreadID(
   parentThreadInfo:
     | ?ServerThreadInfo
     | LegacyRawThreadInfo
     | RawThreadInfo
-    | LegacyThreadInfo
     | ThreadInfo,
   threadType: ThreadType,
 ): ?string {
   if (!parentThreadInfo) {
     return null;
   }
   if (threadType === threadTypes.SIDEBAR) {
     return parentThreadInfo.id;
   }
   if (!parentThreadInfo.containingThreadID) {
     return parentThreadInfo.id;
   }
   return parentThreadInfo.containingThreadID;
 }
 
 function getCommunity(
   parentThreadInfo:
     | ?ServerThreadInfo
     | LegacyRawThreadInfo
     | RawThreadInfo
-    | LegacyThreadInfo
     | ThreadInfo,
 ): ?string {
   if (!parentThreadInfo) {
     return null;
   }
   const { id, community, type } = parentThreadInfo;
   if (community !== null && community !== undefined) {
     return community;
   }
   if (threadTypeIsCommunityRoot(type)) {
     return id;
   }
   return null;
 }
 
 function getThreadListSearchResults(
   chatListData: $ReadOnlyArray<ChatThreadItem>,
   searchText: string,
   threadFilter: ThreadInfo => boolean,
   threadSearchResults: $ReadOnlySet<string>,
   usersSearchResults: $ReadOnlyArray<GlobalAccountUserInfo>,
   loggedInUserInfo: ?LoggedInUserInfo,
 ): $ReadOnlyArray<ChatThreadItem> {
   if (!searchText) {
     return chatListData.filter(
       item =>
         threadIsTopLevel(item.threadInfo) && threadFilter(item.threadInfo),
     );
   }
 
   const privateThreads = [];
   const personalThreads = [];
   const otherThreads = [];
   for (const item of chatListData) {
     if (!threadSearchResults.has(item.threadInfo.id)) {
       continue;
     }
     if (item.threadInfo.type === threadTypes.PRIVATE) {
       privateThreads.push({ ...item, sidebars: [] });
     } else if (item.threadInfo.type === threadTypes.PERSONAL) {
       personalThreads.push({ ...item, sidebars: [] });
     } else {
       otherThreads.push({ ...item, sidebars: [] });
     }
   }
 
   const chatItems: ChatThreadItem[] = [
     ...privateThreads,
     ...personalThreads,
     ...otherThreads,
   ];
   if (loggedInUserInfo) {
     chatItems.push(
       ...usersSearchResults.map(user =>
         createPendingThreadItem(loggedInUserInfo, user),
       ),
     );
   }
   return chatItems;
 }
 
 type ThreadListSearchResult = {
   +threadSearchResults: $ReadOnlySet<string>,
   +usersSearchResults: $ReadOnlyArray<GlobalAccountUserInfo>,
 };
 function useThreadListSearch(
   searchText: string,
   viewerID: ?string,
 ): ThreadListSearchResult {
   const callSearchUsers = useLegacyAshoatKeyserverCall(searchUserCall);
   const usersWithPersonalThread = useSelector(usersWithPersonalThreadSelector);
   const forwardLookupSearchText = useForwardLookupSearchText(searchText);
   const searchUsers = React.useCallback(
     async (usernamePrefix: string) => {
       if (usernamePrefix.length === 0) {
         return ([]: GlobalAccountUserInfo[]);
       }
 
       const { userInfos } = await callSearchUsers(usernamePrefix);
       return userInfos.filter(
         info => !usersWithPersonalThread.has(info.id) && info.id !== viewerID,
       );
     },
     [callSearchUsers, usersWithPersonalThread, viewerID],
   );
 
   const [threadSearchResults, setThreadSearchResults] = React.useState(
     new Set<string>(),
   );
   const [usersSearchResults, setUsersSearchResults] = React.useState<
     $ReadOnlyArray<GlobalAccountUserInfo>,
   >([]);
   const threadSearchIndex = useGlobalThreadSearchIndex();
   React.useEffect(() => {
     void (async () => {
       const results = threadSearchIndex.getSearchResults(searchText);
       setThreadSearchResults(new Set<string>(results));
       const usersResults = await searchUsers(forwardLookupSearchText);
       setUsersSearchResults(usersResults);
     })();
   }, [searchText, forwardLookupSearchText, threadSearchIndex, searchUsers]);
 
   return { threadSearchResults, usersSearchResults };
 }
 
 function removeMemberFromThread(
   threadInfo: ThreadInfo,
   memberInfo: RelativeMemberInfo,
   dispatchActionPromise: DispatchActionPromise,
   removeUserFromThreadServerCall: (
     input: RemoveUsersFromThreadInput,
   ) => Promise<ChangeThreadSettingsPayload>,
 ) {
   const customKeyName = `${removeUsersFromThreadActionTypes.started}:${memberInfo.id}`;
   void dispatchActionPromise(
     removeUsersFromThreadActionTypes,
     removeUserFromThreadServerCall({
       threadID: threadInfo.id,
       memberIDs: [memberInfo.id],
     }),
     { customKeyName },
   );
 }
 
 function getAvailableThreadMemberActions(
   memberInfo: RelativeMemberInfo,
   threadInfo: ThreadInfo,
   canEdit: ?boolean = true,
 ): $ReadOnlyArray<'change_role' | 'remove_user'> {
   const role = memberInfo.role;
   if (!canEdit || !role) {
     return [];
   }
 
   const canRemoveMembers = threadHasPermission(
     threadInfo,
     threadPermissions.REMOVE_MEMBERS,
   );
   const canChangeRoles = threadHasPermission(
     threadInfo,
     threadPermissions.CHANGE_ROLE,
   );
 
   const result = [];
 
   if (canChangeRoles && memberInfo.username && threadHasAdminRole(threadInfo)) {
     result.push('change_role');
   }
 
   if (
     canRemoveMembers &&
     !memberInfo.isViewer &&
     (canChangeRoles || threadInfo.roles[role]?.isDefault)
   ) {
     result.push('remove_user');
   }
 
   return result;
 }
 
 function patchThreadInfoToIncludeMentionedMembersOfParent(
   threadInfo: ThreadInfo,
   parentThreadInfo: ThreadInfo,
   messageText: string,
   viewerID: string,
 ): ThreadInfo {
   const members: UserIDAndUsername[] = threadInfo.members
     .map(({ id, username }) =>
       username ? ({ id, username }: UserIDAndUsername) : null,
     )
     .filter(Boolean);
   const mentionedNewMembers = extractNewMentionedParentMembers(
     messageText,
     threadInfo,
     parentThreadInfo,
   );
   if (mentionedNewMembers.length === 0) {
     return threadInfo;
   }
   members.push(...mentionedNewMembers);
   return createPendingThread({
     viewerID,
     threadType: threadTypes.SIDEBAR,
     members,
     parentThreadInfo,
     threadColor: threadInfo.color,
     name: threadInfo.name,
     sourceMessageID: threadInfo.sourceMessageID,
   });
 }
 
 function threadInfoInsideCommunity(
   threadInfo: RawThreadInfo | ThreadInfo,
   communityID: string,
 ): boolean {
   return threadInfo.community === communityID || threadInfo.id === communityID;
 }
 
 type RoleAndMemberCount = {
   [roleName: string]: number,
 };
 
 function useRoleMemberCountsForCommunity(
   threadInfo: ThreadInfo,
 ): RoleAndMemberCount {
   return React.useMemo(() => {
     const roleIDsToNames: { [string]: string } = {};
 
     Object.keys(threadInfo.roles).forEach(roleID => {
       roleIDsToNames[roleID] = threadInfo.roles[roleID].name;
     });
 
     const roleNamesToMemberCount: RoleAndMemberCount = {};
 
     threadInfo.members.forEach(({ role: roleID }) => {
       invariant(roleID, 'Community member should have a role');
       const roleName = roleIDsToNames[roleID];
 
       roleNamesToMemberCount[roleName] =
         (roleNamesToMemberCount[roleName] ?? 0) + 1;
     });
 
     // For all community roles with no members, add them to the list with 0
     Object.keys(roleIDsToNames).forEach(roleName => {
       if (roleNamesToMemberCount[roleIDsToNames[roleName]] === undefined) {
         roleNamesToMemberCount[roleIDsToNames[roleName]] = 0;
       }
     });
 
     return roleNamesToMemberCount;
   }, [threadInfo]);
 }
 
 type RoleUserSurfacedPermissions = {
   +[roleName: string]: $ReadOnlySet<UserSurfacedPermission>,
 };
 // Iterates through the existing roles in the community and 'reverse maps'
 // the set of permission literals for each role to user-facing permission enums
 // to help pre-populate the permission checkboxes when editing roles.
 function useRoleUserSurfacedPermissions(
-  threadInfo: LegacyThreadInfo | ThreadInfo,
+  threadInfo: ThreadInfo,
 ): RoleUserSurfacedPermissions {
   return React.useMemo(() => {
     const roleNamesToPermissions: { [string]: Set<UserSurfacedPermission> } =
       {};
 
     Object.keys(threadInfo.roles).forEach(roleID => {
       const roleName = threadInfo.roles[roleID].name;
       const rolePermissions = threadInfo.minimallyEncoded
         ? Object.keys(
             decodeMinimallyEncodedRoleInfo(threadInfo.roles[roleID])
               .permissions,
           )
         : Object.keys(threadInfo.roles[roleID].permissions);
       const setOfUserSurfacedPermissions = new Set<UserSurfacedPermission>();
 
       rolePermissions.forEach(rolePermission => {
         const userSurfacedPermission = Object.keys(
           configurableCommunityPermissions,
         ).find(key =>
           configurableCommunityPermissions[key].has(rolePermission),
         );
 
         if (userSurfacedPermission) {
           setOfUserSurfacedPermissions.add(userSurfacedPermission);
         }
       });
       roleNamesToPermissions[roleName] = setOfUserSurfacedPermissions;
     });
 
     return roleNamesToPermissions;
   }, [threadInfo]);
 }
 
 function communityOrThreadNoun(threadInfo: RawThreadInfo | ThreadInfo): string {
   return threadTypeIsCommunityRoot(threadInfo.type)
     ? 'community'
     : threadNoun(threadInfo.type, threadInfo.parentThreadID);
 }
 
 function getThreadsToDeleteText(
   threadInfo: RawThreadInfo | ThreadInfo,
 ): string {
   return `${
     threadTypeIsCommunityRoot(threadInfo.type)
       ? 'Subchannels and threads'
       : 'Threads'
   } within this ${communityOrThreadNoun(threadInfo)}`;
 }
 
 function useUserProfileThreadInfo(userInfo: ?UserInfo): ?UserProfileThreadInfo {
   const userID = userInfo?.id;
   const username = userInfo?.username;
 
   const loggedInUserInfo = useLoggedInUserInfo();
   const isViewerProfile = loggedInUserInfo?.id === userID;
 
   const privateThreadInfosSelector = threadInfosSelectorForThreadType(
     threadTypes.PRIVATE,
   );
   const privateThreadInfos = useSelector(privateThreadInfosSelector);
 
   const personalThreadInfosSelector = threadInfosSelectorForThreadType(
     threadTypes.PERSONAL,
   );
 
   const personalThreadInfos = useSelector(personalThreadInfosSelector);
 
   const usersWithPersonalThread = useSelector(usersWithPersonalThreadSelector);
 
   return React.useMemo(() => {
     if (!loggedInUserInfo || !userID || !username) {
       return null;
     }
 
     if (isViewerProfile) {
       const privateThreadInfo: ?ThreadInfo = privateThreadInfos[0];
 
       return privateThreadInfo ? { threadInfo: privateThreadInfo } : null;
     }
 
     if (usersWithPersonalThread.has(userID)) {
       const personalThreadInfo: ?ThreadInfo = personalThreadInfos.find(
         threadInfo =>
           userID === getSingleOtherUser(threadInfo, loggedInUserInfo.id),
       );
 
       return personalThreadInfo ? { threadInfo: personalThreadInfo } : null;
     }
 
     const pendingPersonalThreadInfo = createPendingPersonalThread(
       loggedInUserInfo,
       userID,
       username,
     );
 
     return pendingPersonalThreadInfo;
   }, [
     isViewerProfile,
     loggedInUserInfo,
     personalThreadInfos,
     privateThreadInfos,
     userID,
     username,
     usersWithPersonalThread,
   ]);
 }
 
 function assertAllThreadInfosAreLegacy(rawThreadInfos: MixedRawThreadInfos): {
   [id: string]: LegacyRawThreadInfo,
 } {
   return Object.fromEntries(
     Object.entries(rawThreadInfos).map(([id, rawThreadInfo]) => {
       invariant(
         !rawThreadInfo.minimallyEncoded,
         `rawThreadInfos shouldn't be minimallyEncoded`,
       );
       return [id, rawThreadInfo];
     }),
   );
 }
 
 export {
   threadHasPermission,
   viewerIsMember,
   threadInChatList,
   threadIsTopLevel,
   threadIsChannel,
   threadIsSidebar,
   threadInBackgroundChatList,
   threadInHomeChatList,
   threadIsInHome,
   threadInFilterList,
   userIsMember,
   threadActualMembers,
   threadOtherMembers,
   threadIsGroupChat,
   threadIsPending,
   threadIsPendingSidebar,
   getSingleOtherUser,
   getPendingThreadID,
   parsePendingThreadID,
   createPendingThread,
   createUnresolvedPendingSidebar,
   extractNewMentionedParentMembers,
   createPendingSidebar,
   pendingThreadType,
   createRealThreadFromPendingThread,
   getCurrentUser,
   getMinimallyEncodedCurrentUser,
   threadFrozenDueToBlock,
   threadFrozenDueToViewerBlock,
   rawThreadInfoFromServerThreadInfo,
   threadUIName,
   threadInfoFromRawThreadInfo,
   threadTypeDescriptions,
   memberIsAdmin,
   memberHasAdminPowers,
   roleIsAdminRole,
   threadHasAdminRole,
   identifyInvalidatedThreads,
   permissionsDisabledByBlock,
   emptyItemText,
   threadNoun,
   threadLabel,
   useWatchThread,
   useExistingThreadInfoFinder,
   getThreadTypeParentRequirement,
   threadMemberHasPermission,
   useCanCreateSidebarFromMessage,
   useSidebarExistsOrCanBeCreated,
   checkIfDefaultMembersAreVoiced,
   draftKeySuffix,
   draftKeyFromThreadID,
   threadTypeCanBePending,
   getContainingThreadID,
   getCommunity,
   getThreadListSearchResults,
   useThreadListSearch,
   removeMemberFromThread,
   getAvailableThreadMemberActions,
   threadMembersWithoutAddedAshoat,
   patchThreadInfoToIncludeMentionedMembersOfParent,
   threadInfoInsideCommunity,
   useRoleMemberCountsForCommunity,
   useRoleUserSurfacedPermissions,
   getThreadsToDeleteText,
   useUserProfileThreadInfo,
   assertAllThreadInfosAreLegacy,
 };
diff --git a/lib/types/messages/create-sidebar.js b/lib/types/messages/create-sidebar.js
index e2aaa6eca..bdd70111e 100644
--- a/lib/types/messages/create-sidebar.js
+++ b/lib/types/messages/create-sidebar.js
@@ -1,59 +1,58 @@
 // @flow
 
 import t, { type TInterface } from 'tcomb';
 
 import { tID, tNumber, tShape } from '../../utils/validation-utils.js';
 import { messageTypes } from '../message-types-enum.js';
 import type { ThreadInfo } from '../minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from '../thread-types.js';
 import type { RelativeUserInfo } from '../user-types.js';
 
 export type CreateSidebarMessageData = {
   +type: 18,
   +threadID: string,
   +creatorID: string,
   +time: number,
   +sourceMessageAuthorID: string,
   +initialThreadState: {
     +name: ?string,
     +parentThreadID: string,
     +color: string,
     +memberIDs: string[],
   },
 };
 
 export type RawCreateSidebarMessageInfo = {
   ...CreateSidebarMessageData,
   id: string,
 };
 
 export const rawCreateSidebarMessageInfoValidator: TInterface<RawCreateSidebarMessageInfo> =
   tShape<RawCreateSidebarMessageInfo>({
     type: tNumber(messageTypes.CREATE_SIDEBAR),
     threadID: tID,
     creatorID: t.String,
     time: t.Number,
     sourceMessageAuthorID: t.String,
     initialThreadState: tShape({
       name: t.maybe(t.String),
       parentThreadID: tID,
       color: t.String,
       memberIDs: t.list(t.String),
     }),
     id: tID,
   });
 
 export type CreateSidebarMessageInfo = {
   +type: 18,
   +id: string,
   +threadID: string,
   +creator: RelativeUserInfo,
   +time: number,
   +sourceMessageAuthor: RelativeUserInfo,
   +initialThreadState: {
     +name: ?string,
-    +parentThreadInfo: LegacyThreadInfo | ThreadInfo,
+    +parentThreadInfo: ThreadInfo,
     +color: string,
     +otherMembers: RelativeUserInfo[],
   },
 };
diff --git a/lib/types/messages/create-subthread.js b/lib/types/messages/create-subthread.js
index afd740046..07ebf2a61 100644
--- a/lib/types/messages/create-subthread.js
+++ b/lib/types/messages/create-subthread.js
@@ -1,41 +1,40 @@
 // @flow
 
 import t, { type TInterface } from 'tcomb';
 
 import { tID, tNumber, tShape } from '../../utils/validation-utils.js';
 import { messageTypes } from '../message-types-enum.js';
 import type { ThreadInfo } from '../minimally-encoded-thread-permissions-types.js';
-import type { LegacyThreadInfo } from '../thread-types.js';
 import type { RelativeUserInfo } from '../user-types.js';
 
 export type CreateSubthreadMessageData = {
   type: 3,
   threadID: string,
   creatorID: string,
   time: number,
   childThreadID: string,
 };
 
 export type RawCreateSubthreadMessageInfo = {
   ...CreateSubthreadMessageData,
   id: string,
 };
 
 export const rawCreateSubthreadMessageInfoValidator: TInterface<RawCreateSubthreadMessageInfo> =
   tShape<RawCreateSubthreadMessageInfo>({
     type: tNumber(messageTypes.CREATE_SUB_THREAD),
     threadID: tID,
     creatorID: t.String,
     time: t.Number,
     childThreadID: tID,
     id: tID,
   });
 
 export type CreateSubthreadMessageInfo = {
   type: 3,
   id: string,
   threadID: string,
   creator: RelativeUserInfo,
   time: number,
-  childThreadInfo: LegacyThreadInfo | ThreadInfo,
+  childThreadInfo: ThreadInfo,
 };
diff --git a/lib/types/messages/create-thread.js b/lib/types/messages/create-thread.js
index c207c7ddd..8e1d7f1d0 100644
--- a/lib/types/messages/create-thread.js
+++ b/lib/types/messages/create-thread.js
@@ -1,66 +1,65 @@
 // @flow
 
 import t, { type TInterface } from 'tcomb';
 
 import { values } from '../../utils/objects.js';
 import {
   tID,
   tNumber,
   tNumEnum,
   tShape,
 } from '../../utils/validation-utils.js';
 import { messageTypes } from '../message-types-enum.js';
 import type { ThreadInfo } from '../minimally-encoded-thread-permissions-types.js';
 import { type ThreadType, threadTypes } from '../thread-types-enum.js';
-import type { LegacyThreadInfo } from '../thread-types.js';
 import type { RelativeUserInfo } from '../user-types.js';
 
 export type CreateThreadMessageData = {
   type: 1,
   threadID: string,
   creatorID: string,
   time: number,
   initialThreadState: {
     type: ThreadType,
     name: ?string,
     parentThreadID: ?string,
     color: string,
     memberIDs: string[],
   },
 };
 
 export type RawCreateThreadMessageInfo = {
   ...CreateThreadMessageData,
   id: string,
 };
 
 export const rawCreateThreadMessageInfoValidator: TInterface<RawCreateThreadMessageInfo> =
   tShape<RawCreateThreadMessageInfo>({
     type: tNumber(messageTypes.CREATE_THREAD),
     threadID: tID,
     creatorID: t.String,
     time: t.Number,
     initialThreadState: tShape({
       type: tNumEnum(values(threadTypes)),
       name: t.maybe(t.String),
       parentThreadID: t.maybe(tID),
       color: t.String,
       memberIDs: t.list(t.String),
     }),
     id: tID,
   });
 
 export type CreateThreadMessageInfo = {
   type: 1,
   id: string,
   threadID: string,
   creator: RelativeUserInfo,
   time: number,
   initialThreadState: {
     type: ThreadType,
     name: ?string,
-    parentThreadInfo: ?LegacyThreadInfo | ?ThreadInfo,
+    parentThreadInfo: ?ThreadInfo,
     color: string,
     otherMembers: RelativeUserInfo[],
   },
 };
diff --git a/lib/utils/entity-text.js b/lib/utils/entity-text.js
index 18ad3b977..c085919b7 100644
--- a/lib/utils/entity-text.js
+++ b/lib/utils/entity-text.js
@@ -1,608 +1,597 @@
 // @flow
 
 import invariant from 'invariant';
 import * as React from 'react';
 import t, { type TInterface, type TUnion } from 'tcomb';
 
 import type { GetENSNames } from './ens-helpers.js';
 import { tID, tShape, tString } from './validation-utils.js';
 import { useENSNames, type UseENSNamesOptions } from '../hooks/ens-cache.js';
 import { threadNoun } from '../shared/thread-utils.js';
 import { stringForUser } from '../shared/user-utils.js';
 import type {
   ThreadInfo,
   RawThreadInfo,
 } from '../types/minimally-encoded-thread-permissions-types.js';
 import {
   type ThreadType,
   threadTypes,
   threadTypeValidator,
 } from '../types/thread-types-enum.js';
-import type {
-  LegacyRawThreadInfo,
-  LegacyThreadInfo,
-} from '../types/thread-types.js';
+import type { LegacyRawThreadInfo } from '../types/thread-types.js';
 import { basePluralize } from '../utils/text-utils.js';
 
 export type UserEntity = {
   +type: 'user',
   +id: string,
   +username?: ?string,
   +isViewer?: ?boolean,
   +possessive?: ?boolean, // eg. `user's` instead of `user`
 };
 export const userEntityValidator: TInterface<UserEntity> = tShape<UserEntity>({
   type: tString('user'),
   id: t.String,
   username: t.maybe(t.String),
   isViewer: t.maybe(t.Boolean),
   possessive: t.maybe(t.Boolean),
 });
 
 // Comments explain how thread name will appear from user4's perspective
 export type ThreadEntity =
   | {
       +type: 'thread',
       +id: string,
       +name?: ?string,
       // displays threadInfo.name if set, or 'user1, user2, and user3'
       +display: 'uiName',
       // If uiName is EntityText, then at render time ThreadEntity will be
       // replaced with a pluralized list of uiName's UserEntities
       +uiName: $ReadOnlyArray<UserEntity> | string,
       // If name isn't set and uiName is an array with only the viewer, then
       // just_you_string displays "just you" but viewer_username displays the
       // viewer's ENS-resolved username. Defaults to just_you_string
       +ifJustViewer?: 'just_you_string' | 'viewer_username',
     }
   | {
       +type: 'thread',
       +id: string,
       +name?: ?string,
       // displays threadInfo.name if set, or eg. 'this thread' or 'this chat'
       +display: 'shortName',
       +threadType?: ?ThreadType,
       +parentThreadID?: ?string,
       +alwaysDisplayShortName?: ?boolean, // don't default to name
       +subchannel?: ?boolean, // short name should be "subchannel"
       +possessive?: ?boolean, // eg. `this thread's` instead of `this thread`
     };
 
 export const threadEntityValidator: TUnion<ThreadEntity> = t.union([
   tShape({
     type: tString('thread'),
     id: tID,
     name: t.maybe(t.String),
     display: tString('uiName'),
     uiName: t.union([t.list(userEntityValidator), t.String]),
     ifJustViewer: t.maybe(t.enums.of(['just_you_string', 'viewer_username'])),
   }),
   tShape({
     type: tString('thread'),
     id: tID,
     name: t.maybe(t.String),
     display: tString('shortName'),
     threadType: t.maybe(threadTypeValidator),
     parentThreadID: t.maybe(tID),
     alwaysDisplayShortName: t.maybe(t.Boolean),
     subchannel: t.maybe(t.Boolean),
     possessive: t.maybe(t.Boolean),
   }),
 ]);
 
 type ColorEntity = {
   +type: 'color',
   +hex: string,
 };
 
 type EntityTextComponent = UserEntity | ThreadEntity | ColorEntity | string;
 
 export type EntityText = $ReadOnlyArray<EntityTextComponent>;
 
 const entityTextFunction = (
   strings: $ReadOnlyArray<string>,
   ...entities: $ReadOnlyArray<EntityTextComponent | EntityText>
 ) => {
   const result: EntityTextComponent[] = [];
   for (let i = 0; i < strings.length; i++) {
     const str = strings[i];
     if (str) {
       result.push(str);
     }
     const entity = entities[i];
     if (!entity) {
       continue;
     }
 
     if (typeof entity === 'string') {
       const lastResult = result.length > 0 && result[result.length - 1];
       if (typeof lastResult === 'string') {
         result[result.length - 1] = lastResult + entity;
       } else {
         result.push(entity);
       }
     } else if (Array.isArray(entity)) {
       const [firstEntity, ...restOfEntity] = entity;
       const lastResult = result.length > 0 && result[result.length - 1];
       if (typeof lastResult === 'string' && typeof firstEntity === 'string') {
         result[result.length - 1] = lastResult + firstEntity;
       } else if (firstEntity) {
         result.push(firstEntity);
       }
       result.push(...restOfEntity);
     } else {
       result.push(entity);
     }
   }
   return result;
 };
 
 // defaults to shortName
 type EntityTextThreadInput =
   | {
       +display: 'uiName',
-      +threadInfo: LegacyThreadInfo | ThreadInfo,
+      +threadInfo: ThreadInfo,
     }
   | {
       +display?: 'shortName',
-      +threadInfo:
-        | LegacyRawThreadInfo
-        | RawThreadInfo
-        | LegacyThreadInfo
-        | ThreadInfo,
+      +threadInfo: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
       +subchannel?: ?boolean,
       +possessive?: ?boolean,
     }
   | {
       +display: 'alwaysDisplayShortName',
-      +threadInfo:
-        | LegacyRawThreadInfo
-        | RawThreadInfo
-        | LegacyThreadInfo
-        | ThreadInfo,
+      +threadInfo: LegacyRawThreadInfo | RawThreadInfo | ThreadInfo,
       +possessive?: ?boolean,
     }
   | {
       +display: 'alwaysDisplayShortName',
       +threadID: string,
       +parentThreadID?: ?string,
       +threadType?: ?ThreadType,
       +possessive?: ?boolean,
     };
 // ESLint doesn't recognize that invariant always throws
 // eslint-disable-next-line consistent-return
 entityTextFunction.thread = (input: EntityTextThreadInput) => {
   if (input.display === 'uiName') {
     const { threadInfo } = input;
     if (typeof threadInfo.uiName !== 'string') {
       return threadInfo.uiName;
     }
     return {
       type: 'thread',
       id: threadInfo.id,
       name: threadInfo.name,
       display: 'uiName',
       uiName: threadInfo.uiName,
     };
   }
   if (input.display === 'alwaysDisplayShortName' && input.threadID) {
     const { threadID, threadType, parentThreadID, possessive } = input;
     return {
       type: 'thread',
       id: threadID,
       name: undefined,
       display: 'shortName',
       threadType,
       parentThreadID,
       alwaysDisplayShortName: true,
       possessive,
     };
   } else if (input.display === 'alwaysDisplayShortName' && input.threadInfo) {
     const { threadInfo, possessive } = input;
     return {
       type: 'thread',
       id: threadInfo.id,
       name: threadInfo.name,
       display: 'shortName',
       threadType: threadInfo.type,
       parentThreadID: threadInfo.parentThreadID,
       alwaysDisplayShortName: true,
       possessive,
     };
   } else if (input.display === 'shortName' || !input.display) {
     const { threadInfo, subchannel, possessive } = input;
     return {
       type: 'thread',
       id: threadInfo.id,
       name: threadInfo.name,
       display: 'shortName',
       threadType: threadInfo.type,
       parentThreadID: threadInfo.parentThreadID,
       subchannel,
       possessive,
     };
   }
   invariant(
     false,
     `ET.thread passed unexpected display type: ${input.display}`,
   );
 };
 
 type EntityTextUserInput = {
   +userInfo: {
     +id: string,
     +username?: ?string,
     +isViewer?: ?boolean,
     ...
   },
   +possessive?: ?boolean,
 };
 entityTextFunction.user = (input: EntityTextUserInput) => ({
   type: 'user',
   id: input.userInfo.id,
   username: input.userInfo.username,
   isViewer: input.userInfo.isViewer,
   possessive: input.possessive,
 });
 
 type EntityTextColorInput = { +hex: string };
 entityTextFunction.color = (input: EntityTextColorInput) => ({
   type: 'color',
   hex: input.hex,
 });
 
 // ET is a JS tag function used in template literals, eg. ET`something`
 // It allows you to compose raw text and "entities" together
 type EntityTextFunction = ((
   strings: $ReadOnlyArray<string>,
   ...entities: $ReadOnlyArray<EntityTextComponent | EntityText>
 ) => EntityText) & {
   +thread: EntityTextThreadInput => ThreadEntity,
   +user: EntityTextUserInput => UserEntity,
   +color: EntityTextColorInput => ColorEntity,
   ...
 };
 const ET: EntityTextFunction = entityTextFunction;
 
 type MakePossessiveInput = { +str: string, +isViewer?: ?boolean };
 function makePossessive(input: MakePossessiveInput) {
   if (input.isViewer) {
     return 'your';
   }
   return `${input.str}’s`;
 }
 
 function getNameForThreadEntity(
   entity: ThreadEntity,
   params?: ?EntityTextToRawStringParams,
 ): string {
   const { name: userGeneratedName, display } = entity;
   if (entity.display === 'uiName') {
     if (userGeneratedName) {
       return userGeneratedName;
     }
     const { uiName } = entity;
     if (typeof uiName === 'string') {
       return uiName;
     }
 
     let userEntities = uiName;
     if (!params?.ignoreViewer) {
       const viewerFilteredUserEntities = userEntities.filter(
         innerEntity => !innerEntity.isViewer,
       );
       if (viewerFilteredUserEntities.length > 0) {
         userEntities = viewerFilteredUserEntities;
       } else if (entity.ifJustViewer === 'viewer_username') {
         // We pass ignoreViewer to entityTextToRawString in order
         // to prevent it from rendering the viewer as "you"
         params = { ...params, ignoreViewer: true };
       } else {
         return 'just you';
       }
     }
 
     const pluralized = pluralizeEntityText(
       userEntities.map(innerEntity => [innerEntity]),
     );
     return entityTextToRawString(pluralized, params);
   }
 
   invariant(
     entity.display === 'shortName',
     `getNameForThreadEntity can't handle thread entity display ${display}`,
   );
 
   let { name } = entity;
   if (!name || entity.alwaysDisplayShortName) {
     const threadType = entity.threadType ?? threadTypes.PERSONAL;
     const { parentThreadID } = entity;
     const noun = entity.subchannel
       ? 'subchannel'
       : threadNoun(threadType, parentThreadID);
     if (entity.id === params?.threadID) {
       const prefixThisThreadNounWith =
         params?.prefixThisThreadNounWith === 'your' ? 'your' : 'this';
       name = `${prefixThisThreadNounWith} ${noun}`;
     } else {
       name = `a ${noun}`;
     }
   }
   if (entity.possessive) {
     name = makePossessive({ str: name });
   }
   return name;
 }
 
 function getNameForUserEntity(
   entity: UserEntity,
   ignoreViewer: ?boolean,
 ): string {
   const isViewer = entity.isViewer && !ignoreViewer;
   const entityWithIsViewerIgnored = { ...entity, isViewer };
   const str = stringForUser(entityWithIsViewerIgnored);
   if (!entityWithIsViewerIgnored.possessive) {
     return str;
   }
   return makePossessive({ str, isViewer });
 }
 
 type EntityTextToRawStringParams = {
   +threadID?: ?string,
   +ignoreViewer?: ?boolean,
   +prefixThisThreadNounWith?: ?('this' | 'your'),
 };
 function entityTextToRawString(
   entityText: EntityText,
   params?: ?EntityTextToRawStringParams,
 ): string {
   // ESLint doesn't recognize that invariant always throws
   // eslint-disable-next-line consistent-return
   const textParts = entityText.map(entity => {
     if (typeof entity === 'string') {
       return entity;
     } else if (entity.type === 'thread') {
       return getNameForThreadEntity(entity, params);
     } else if (entity.type === 'color') {
       return entity.hex;
     } else if (entity.type === 'user') {
       return getNameForUserEntity(entity, params?.ignoreViewer);
     } else {
       invariant(
         false,
         `entityTextToRawString can't handle entity type ${entity.type}`,
       );
     }
   });
   return textParts.join('');
 }
 
 type RenderFunctions = {
   +renderText: ({ +text: string }) => React.Node,
   +renderThread: ({ +id: string, +name: string }) => React.Node,
   +renderUser: ({ +userID: string, +usernameText: string }) => React.Node,
   +renderColor: ({ +hex: string }) => React.Node,
 };
 function entityTextToReact(
   entityText: EntityText,
   threadID: string,
   renderFuncs: RenderFunctions,
 ): React.Node {
   const { renderText, renderThread, renderUser, renderColor } = renderFuncs;
   // ESLint doesn't recognize that invariant always throws
   // eslint-disable-next-line consistent-return
   return entityText.map((entity, i) => {
     const key = `text${i}`;
     if (typeof entity === 'string') {
       return (
         <React.Fragment key={key}>
           {renderText({ text: entity })}
         </React.Fragment>
       );
     } else if (entity.type === 'thread') {
       const { id } = entity;
       const name = getNameForThreadEntity(entity, { threadID });
       if (id === threadID) {
         return name;
       } else {
         return (
           <React.Fragment key={key}>
             {renderThread({ id, name })}
           </React.Fragment>
         );
       }
     } else if (entity.type === 'color') {
       return (
         <React.Fragment key={key}>
           {renderColor({ hex: entity.hex })}
         </React.Fragment>
       );
     } else if (entity.type === 'user') {
       const userID = entity.id;
       const usernameText = getNameForUserEntity(entity);
 
       return (
         <React.Fragment key={key}>
           {renderUser({ userID, usernameText })}
         </React.Fragment>
       );
     } else {
       invariant(
         false,
         `entityTextToReact can't handle entity type ${entity.type}`,
       );
     }
   });
 }
 
 function pluralizeEntityText(
   nouns: $ReadOnlyArray<EntityText>,
   maxNumberOfNouns: number = 3,
 ): EntityText {
   return basePluralize<EntityText>(
     nouns,
     maxNumberOfNouns,
     (a: EntityText | string, b: ?EntityText | string) =>
       b ? ET`${a}${b}` : ET`${a}`,
   );
 }
 
 type TextEntity = { +type: 'text', +text: string };
 type ShadowUserEntity = {
   +type: 'shadowUser',
   +username: string,
   +originalUsername: string,
 };
 type EntityTextComponentAsObject =
   | UserEntity
   | ThreadEntity
   | ColorEntity
   | TextEntity
   | ShadowUserEntity;
 function entityTextToObjects(
   entityText: EntityText,
 ): EntityTextComponentAsObject[] {
   const objs: EntityTextComponentAsObject[] = [];
   for (const entity of entityText) {
     if (typeof entity === 'string') {
       objs.push({ type: 'text', text: entity });
       continue;
     }
     objs.push(entity);
     if (
       entity.type === 'thread' &&
       entity.display === 'uiName' &&
       typeof entity.uiName !== 'string'
     ) {
       for (const innerEntity of entity.uiName) {
         if (typeof innerEntity === 'string' || innerEntity.type !== 'user') {
           continue;
         }
         const { username } = innerEntity;
         if (username) {
           objs.push({
             type: 'shadowUser',
             originalUsername: username,
             username,
           });
         }
       }
     }
   }
   return objs;
 }
 function entityTextFromObjects(
   objects: $ReadOnlyArray<EntityTextComponentAsObject>,
 ): EntityText {
   const shadowUserMap = new Map<string, string>();
   for (const obj of objects) {
     if (obj.type === 'shadowUser' && obj.username !== obj.originalUsername) {
       shadowUserMap.set(obj.originalUsername, obj.username);
     }
   }
   return objects
     .map(entity => {
       if (entity.type === 'text') {
         return entity.text;
       } else if (entity.type === 'shadowUser') {
         return null;
       } else if (
         entity.type === 'thread' &&
         entity.display === 'uiName' &&
         typeof entity.uiName !== 'string'
       ) {
         const uiName: UserEntity[] = [];
         let changeOccurred = false;
         for (const innerEntity of entity.uiName) {
           if (typeof innerEntity === 'string' || innerEntity.type !== 'user') {
             uiName.push(innerEntity);
             continue;
           }
           const { username } = innerEntity;
           if (!username) {
             uiName.push(innerEntity);
             continue;
           }
           const ensName = shadowUserMap.get(username);
           if (!ensName) {
             uiName.push(innerEntity);
             continue;
           }
           changeOccurred = true;
           uiName.push({
             ...innerEntity,
             username: ensName,
           });
         }
         if (!changeOccurred) {
           return entity;
         }
         return {
           ...entity,
           uiName,
         };
       } else {
         return entity;
       }
     })
     .filter(Boolean);
 }
 
 function useENSNamesForEntityText(
   entityText: ?EntityText,
   options?: ?UseENSNamesOptions,
 ): ?EntityText {
   const allObjects = React.useMemo(
     () => (entityText ? entityTextToObjects(entityText) : []),
     [entityText],
   );
   const objectsWithENSNames = useENSNames(allObjects, options);
   return React.useMemo(
     () =>
       entityText ? entityTextFromObjects(objectsWithENSNames) : entityText,
     [entityText, objectsWithENSNames],
   );
 }
 
 function useEntityTextAsString(
   entityText: ?EntityText,
   params?: EntityTextToRawStringParams,
 ): ?string {
   const withENSNames = useENSNamesForEntityText(entityText);
   return React.useMemo(() => {
     if (!withENSNames) {
       return withENSNames;
     }
     return entityTextToRawString(withENSNames, params);
   }, [withENSNames, params]);
 }
 
 async function getEntityTextAsString(
   entityText: ?EntityText,
   getENSNames: ?GetENSNames,
   params?: EntityTextToRawStringParams,
 ): Promise<?string> {
   if (!entityText) {
     return entityText;
   }
 
   let resolvedEntityText = entityText;
   if (getENSNames) {
     const allObjects = entityTextToObjects(entityText);
     const objectsWithENSNames = await getENSNames(allObjects);
     resolvedEntityText = entityTextFromObjects(objectsWithENSNames);
   }
 
   return entityTextToRawString(resolvedEntityText, params);
 }
 
 export {
   ET,
   entityTextToRawString,
   entityTextToReact,
   getNameForThreadEntity,
   pluralizeEntityText,
   useENSNamesForEntityText,
   useEntityTextAsString,
   getEntityTextAsString,
 };