diff --git a/native/chat/composed-message.react.js b/native/chat/composed-message.react.js
index 174f9e8fc..83e3e40eb 100644
--- a/native/chat/composed-message.react.js
+++ b/native/chat/composed-message.react.js
@@ -1,224 +1,224 @@
 // @flow
 
 import invariant from 'invariant';
 import * as React from 'react';
 import { StyleSheet, View } from 'react-native';
 import Animated from 'react-native-reanimated';
 import Icon from 'react-native-vector-icons/Feather';
 
 import { createMessageReply } from 'lib/shared/message-utils';
 import { assertComposableMessageType } from 'lib/types/message-types';
 
 import { type InputState, InputStateContext } from '../input/input-state';
 import { type Colors, useColors } from '../themes/colors';
 import type { ChatMessageInfoItemWithHeight } from '../types/chat-types';
 import { type AnimatedStyleObj, AnimatedView } from '../types/styles';
 import { useComposedMessageMaxWidth } from './composed-message-width';
 import { FailedSend } from './failed-send.react';
 import {
-  InlineSidebar,
-  inlineSidebarMarginBottom,
   inlineSidebarMarginTop,
-} from './inline-sidebar.react';
+  inlineSidebarMarginBottom,
+} from './inline-sidebar-constants';
+import InlineSidebar from './inline-sidebar.react';
 import { MessageHeader } from './message-header.react';
 import { useNavigateToSidebar } from './sidebar-navigation';
 import SwipeableMessage from './swipeable-message.react';
 import { useContentAndHeaderOpacity, useDeliveryIconOpacity } from './utils';
 
 /* eslint-disable import/no-named-as-default-member */
 const { Node } = Animated;
 /* eslint-enable import/no-named-as-default-member */
 
 const clusterEndHeight = 7;
 
 type SwipeOptions = 'reply' | 'sidebar' | 'both' | 'none';
 type BaseProps = {
   ...React.ElementConfig<typeof View>,
   +item: ChatMessageInfoItemWithHeight,
   +sendFailed: boolean,
   +focused: boolean,
   +swipeOptions: SwipeOptions,
   +children: React.Node,
 };
 type Props = {
   ...BaseProps,
   // Redux state
   +composedMessageMaxWidth: number,
   +colors: Colors,
   +contentAndHeaderOpacity: number | Node,
   +deliveryIconOpacity: number | Node,
   // withInputState
   +inputState: ?InputState,
   +navigateToSidebar: () => void,
 };
 class ComposedMessage extends React.PureComponent<Props> {
   render() {
     assertComposableMessageType(this.props.item.messageInfo.type);
     const {
       item,
       sendFailed,
       focused,
       swipeOptions,
       children,
       composedMessageMaxWidth,
       colors,
       inputState,
       navigateToSidebar,
       contentAndHeaderOpacity,
       deliveryIconOpacity,
       ...viewProps
     } = this.props;
     const { id, creator } = item.messageInfo;
 
     const { isViewer } = creator;
     const alignStyle = isViewer
       ? styles.rightChatBubble
       : styles.leftChatBubble;
     const containerStyle = [
       styles.alignment,
       { marginBottom: 5 + (item.endsCluster ? clusterEndHeight : 0) },
     ];
     const messageBoxStyle = { maxWidth: composedMessageMaxWidth };
 
     let deliveryIcon = null;
     let failedSendInfo = null;
     if (isViewer) {
       let deliveryIconName;
       let deliveryIconColor = `#${item.threadInfo.color}`;
       if (id !== null && id !== undefined) {
         deliveryIconName = 'check-circle';
       } else if (sendFailed) {
         deliveryIconName = 'x-circle';
         deliveryIconColor = colors.redText;
         failedSendInfo = <FailedSend item={item} />;
       } else {
         deliveryIconName = 'circle';
       }
 
       const animatedStyle: AnimatedStyleObj = { opacity: deliveryIconOpacity };
       deliveryIcon = (
         <AnimatedView style={[styles.iconContainer, animatedStyle]}>
           <Icon
             name={deliveryIconName}
             style={[styles.icon, { color: deliveryIconColor }]}
           />
         </AnimatedView>
       );
     }
 
     const triggerReply =
       swipeOptions === 'reply' || swipeOptions === 'both'
         ? this.reply
         : undefined;
     const triggerSidebar =
       swipeOptions === 'sidebar' || swipeOptions === 'both'
         ? navigateToSidebar
         : undefined;
     const messageBox = (
       <View style={styles.messageBox}>
         <SwipeableMessage
           triggerReply={triggerReply}
           triggerSidebar={triggerSidebar}
           isViewer={isViewer}
           messageBoxStyle={messageBoxStyle}
           threadColor={item.threadInfo.color}
         >
           <AnimatedView style={{ opacity: contentAndHeaderOpacity }}>
             {children}
           </AnimatedView>
         </SwipeableMessage>
       </View>
     );
 
     let inlineSidebar = null;
     if (item.threadCreatedFromMessage) {
       const positioning = isViewer ? 'right' : 'left';
       inlineSidebar = (
         <View style={styles.inlineSidebar}>
           <InlineSidebar
             threadInfo={item.threadCreatedFromMessage}
             positioning={positioning}
           />
         </View>
       );
     }
 
     return (
       <View {...viewProps}>
         <AnimatedView style={{ opacity: contentAndHeaderOpacity }}>
           <MessageHeader item={item} focused={focused} display="lowContrast" />
         </AnimatedView>
         <View style={containerStyle}>
           <View style={[styles.content, alignStyle]}>
             {deliveryIcon}
             {messageBox}
           </View>
           {failedSendInfo}
           {inlineSidebar}
         </View>
       </View>
     );
   }
 
   reply = () => {
     const { inputState, item } = this.props;
     invariant(inputState, 'inputState should be set in reply');
     invariant(item.messageInfo.text, 'text should be set in reply');
     inputState.addReply(createMessageReply(item.messageInfo.text));
   };
 }
 
 const styles = StyleSheet.create({
   alignment: {
     marginLeft: 12,
     marginRight: 7,
   },
   content: {
     alignItems: 'center',
     flexDirection: 'row-reverse',
   },
   icon: {
     fontSize: 16,
     textAlign: 'center',
   },
   iconContainer: {
     marginLeft: 2,
     width: 16,
   },
   inlineSidebar: {
     marginBottom: inlineSidebarMarginBottom,
     marginTop: inlineSidebarMarginTop,
   },
   leftChatBubble: {
     justifyContent: 'flex-end',
   },
   messageBox: {
     marginRight: 5,
   },
   rightChatBubble: {
     justifyContent: 'flex-start',
   },
 });
 
 const ConnectedComposedMessage: React.ComponentType<BaseProps> = React.memo<BaseProps>(
   function ConnectedComposedMessage(props: BaseProps) {
     const composedMessageMaxWidth = useComposedMessageMaxWidth();
     const colors = useColors();
     const inputState = React.useContext(InputStateContext);
     const navigateToSidebar = useNavigateToSidebar(props.item);
     const contentAndHeaderOpacity = useContentAndHeaderOpacity(props.item);
     const deliveryIconOpacity = useDeliveryIconOpacity(props.item);
     return (
       <ComposedMessage
         {...props}
         composedMessageMaxWidth={composedMessageMaxWidth}
         colors={colors}
         inputState={inputState}
         navigateToSidebar={navigateToSidebar}
         contentAndHeaderOpacity={contentAndHeaderOpacity}
         deliveryIconOpacity={deliveryIconOpacity}
       />
     );
   },
 );
 export { ConnectedComposedMessage as ComposedMessage, clusterEndHeight };
diff --git a/native/chat/inline-sidebar-constants.js b/native/chat/inline-sidebar-constants.js
new file mode 100644
index 000000000..13152ef4e
--- /dev/null
+++ b/native/chat/inline-sidebar-constants.js
@@ -0,0 +1,5 @@
+// @flow
+
+export const inlineSidebarHeight = 20;
+export const inlineSidebarMarginTop = 5;
+export const inlineSidebarMarginBottom = 3;
diff --git a/native/chat/inline-sidebar.react.js b/native/chat/inline-sidebar.react.js
index 601a2d19c..9824aa23e 100644
--- a/native/chat/inline-sidebar.react.js
+++ b/native/chat/inline-sidebar.react.js
@@ -1,107 +1,99 @@
 // @flow
 
 import * as React from 'react';
 import { Text, View } from 'react-native';
 import Icon from 'react-native-vector-icons/Feather';
 
 import useInlineSidebarText from 'lib/hooks/inline-sidebar-text.react';
 import type { ThreadInfo } from 'lib/types/thread-types';
 
 import Button from '../components/button.react';
 import { useStyles } from '../themes/colors';
+import { inlineSidebarHeight } from './inline-sidebar-constants';
 import { useNavigateToThread } from './message-list-types';
 
 type Props = {
   +threadInfo: ThreadInfo,
   +positioning: 'left' | 'center' | 'right',
 };
 function InlineSidebar(props: Props): React.Node {
   const { threadInfo } = props;
   const { sendersText, repliesText } = useInlineSidebarText(threadInfo);
 
   const navigateToThread = useNavigateToThread();
   const onPress = React.useCallback(() => {
     navigateToThread({ threadInfo });
   }, [navigateToThread, threadInfo]);
 
   const styles = useStyles(unboundStyles);
   let viewerIcon, nonViewerIcon, alignStyle;
   if (props.positioning === 'right') {
     viewerIcon = <Icon name="corner-down-left" size={18} style={styles.icon} />;
     alignStyle = styles.rightAlign;
   } else if (props.positioning === 'left') {
     nonViewerIcon = (
       <Icon name="corner-down-right" size={18} style={styles.icon} />
     );
     alignStyle = styles.leftAlign;
   } else {
     nonViewerIcon = (
       <Icon name="corner-down-right" size={18} style={styles.icon} />
     );
     alignStyle = styles.centerAlign;
   }
 
   const unreadStyle = threadInfo.currentUser.unread ? styles.unread : null;
 
   return (
     <View style={[styles.content, alignStyle]}>
       <Button style={styles.sidebar} onPress={onPress}>
         {nonViewerIcon}
         <Text style={[styles.name, unreadStyle]}>
           {sendersText}
           {repliesText}
         </Text>
         {viewerIcon}
       </Button>
     </View>
   );
 }
 
-const inlineSidebarHeight = 20;
-const inlineSidebarMarginTop = 5;
-const inlineSidebarMarginBottom = 3;
-
 const unboundStyles = {
   content: {
     flexDirection: 'row',
     marginRight: 30,
     marginLeft: 10,
     flex: 1,
     height: inlineSidebarHeight,
   },
   unread: {
     color: 'listForegroundLabel',
     fontWeight: 'bold',
   },
   sidebar: {
     flexDirection: 'row',
     display: 'flex',
     alignItems: 'center',
   },
   icon: {
     color: 'listForegroundTertiaryLabel',
   },
   name: {
     paddingTop: 1,
     color: 'listForegroundTertiaryLabel',
     fontSize: 16,
     paddingLeft: 4,
     paddingRight: 2,
   },
   leftAlign: {
     justifyContent: 'flex-start',
   },
   rightAlign: {
     justifyContent: 'flex-end',
   },
   centerAlign: {
     justifyContent: 'center',
   },
 };
 
-export {
-  InlineSidebar,
-  inlineSidebarHeight,
-  inlineSidebarMarginTop,
-  inlineSidebarMarginBottom,
-};
+export default InlineSidebar;
diff --git a/native/chat/multimedia-message-utils.js b/native/chat/multimedia-message-utils.js
index abff92e3f..f2a34dbec 100644
--- a/native/chat/multimedia-message-utils.js
+++ b/native/chat/multimedia-message-utils.js
@@ -1,146 +1,146 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { messageKey } from 'lib/shared/message-utils';
 import type { MediaInfo } from 'lib/types/media-types';
 import type { MultimediaMessageInfo } from 'lib/types/message-types';
 
 import type {
   ChatMultimediaMessageInfoItem,
   MultimediaContentSizes,
 } from '../types/chat-types';
 import { clusterEndHeight } from './composed-message.react';
 import { failedSendHeight } from './failed-send.react';
 import {
-  inlineSidebarHeight,
   inlineSidebarMarginBottom,
   inlineSidebarMarginTop,
-} from './inline-sidebar.react';
+  inlineSidebarHeight,
+} from './inline-sidebar-constants';
 import { authorNameHeight } from './message-header.react';
 
 const spaceBetweenImages = 4;
 
 function getMediaPerRow(mediaCount: number): number {
   if (mediaCount === 0) {
     return 0; // ???
   } else if (mediaCount === 1) {
     return 1;
   } else if (mediaCount === 2) {
     return 2;
   } else if (mediaCount === 3) {
     return 3;
   } else if (mediaCount === 4) {
     return 2;
   } else {
     return 3;
   }
 }
 
 function multimediaMessageSendFailed(
   item: ChatMultimediaMessageInfoItem,
 ): boolean {
   const { messageInfo, localMessageInfo, pendingUploads } = item;
   const { id: serverID } = messageInfo;
   if (serverID !== null && serverID !== undefined) {
     return false;
   }
 
   const { isViewer } = messageInfo.creator;
   if (!isViewer) {
     return false;
   }
 
   if (localMessageInfo && localMessageInfo.sendFailed) {
     return true;
   }
 
   for (const media of messageInfo.media) {
     const pendingUpload = pendingUploads && pendingUploads[media.id];
     if (pendingUpload && pendingUpload.failed) {
       return true;
     }
   }
 
   return !pendingUploads;
 }
 
 // The results are merged into ChatMultimediaMessageInfoItem
 function multimediaMessageContentSizes(
   messageInfo: MultimediaMessageInfo,
   composedMessageMaxWidth: number,
 ): MultimediaContentSizes {
   invariant(messageInfo.media.length > 0, 'should have media');
 
   if (messageInfo.media.length === 1) {
     const [media] = messageInfo.media;
     const { height, width } = media.dimensions;
 
     let imageHeight = height;
     if (width > composedMessageMaxWidth) {
       imageHeight = (height * composedMessageMaxWidth) / width;
     }
     if (imageHeight < 50) {
       imageHeight = 50;
     }
 
     let contentWidth = height ? (width * imageHeight) / height : 0;
     if (contentWidth > composedMessageMaxWidth) {
       contentWidth = composedMessageMaxWidth;
     }
 
     return { imageHeight, contentHeight: imageHeight, contentWidth };
   }
 
   const contentWidth = composedMessageMaxWidth;
 
   const mediaPerRow = getMediaPerRow(messageInfo.media.length);
   const marginSpace = spaceBetweenImages * (mediaPerRow - 1);
   const imageHeight = (contentWidth - marginSpace) / mediaPerRow;
 
   const numRows = Math.ceil(messageInfo.media.length / mediaPerRow);
   const contentHeight =
     numRows * imageHeight + (numRows - 1) * spaceBetweenImages;
 
   return { imageHeight, contentHeight, contentWidth };
 }
 
 // Given a ChatMultimediaMessageInfoItem, determines exact height of row
 function multimediaMessageItemHeight(
   item: ChatMultimediaMessageInfoItem,
 ): number {
   const { messageInfo, contentHeight, startsCluster, endsCluster } = item;
   const { creator } = messageInfo;
   const { isViewer } = creator;
   let height = 5 + contentHeight; // 5 from marginBottom in ComposedMessage
   if (!isViewer && startsCluster) {
     height += authorNameHeight;
   }
   if (endsCluster) {
     height += clusterEndHeight;
   }
   if (multimediaMessageSendFailed(item)) {
     height += failedSendHeight;
   }
   if (item.threadCreatedFromMessage) {
     height +=
       inlineSidebarHeight + inlineSidebarMarginTop + inlineSidebarMarginBottom;
   }
   return height;
 }
 
 function getMediaKey(
   item: ChatMultimediaMessageInfoItem,
   mediaInfo: MediaInfo,
 ): string {
   return `multimedia|${messageKey(item.messageInfo)}|${mediaInfo.index}`;
 }
 
 export {
   multimediaMessageContentSizes,
   multimediaMessageItemHeight,
   multimediaMessageSendFailed,
   getMediaPerRow,
   spaceBetweenImages,
   getMediaKey,
 };
diff --git a/native/chat/robotext-message.react.js b/native/chat/robotext-message.react.js
index e1b09650d..7b507591e 100644
--- a/native/chat/robotext-message.react.js
+++ b/native/chat/robotext-message.react.js
@@ -1,199 +1,199 @@
 // @flow
 
 import invariant from 'invariant';
 import * as React from 'react';
 import { View } from 'react-native';
 
 import { messageKey } from 'lib/shared/message-utils';
 import { useCanCreateSidebarFromMessage } from 'lib/shared/thread-utils';
 
 import { KeyboardContext } from '../keyboard/keyboard-state';
 import { OverlayContext } from '../navigation/overlay-context';
 import { RobotextMessageTooltipModalRouteName } from '../navigation/route-names';
 import type { NavigationRoute } from '../navigation/route-names';
 import { useStyles } from '../themes/colors';
 import type { ChatRobotextMessageInfoItemWithHeight } from '../types/chat-types';
 import type { VerticalBounds } from '../types/layout-types';
 import { AnimatedView } from '../types/styles';
 import type { ChatNavigationProp } from './chat.react';
-import { InlineSidebar } from './inline-sidebar.react';
+import InlineSidebar from './inline-sidebar.react';
 import { InnerRobotextMessage } from './inner-robotext-message.react';
 import { robotextMessageTooltipHeight } from './robotext-message-tooltip-modal.react';
 import { Timestamp } from './timestamp.react';
 import { getMessageTooltipKey, useContentAndHeaderOpacity } from './utils';
 
 type Props = {
   ...React.ElementConfig<typeof View>,
   +item: ChatRobotextMessageInfoItemWithHeight,
   +navigation: ChatNavigationProp<'MessageList'>,
   +route: NavigationRoute<'MessageList'>,
   +focused: boolean,
   +toggleFocus: (messageKey: string) => void,
   +verticalBounds: ?VerticalBounds,
 };
 function RobotextMessage(props: Props): React.Node {
   const {
     item,
     navigation,
     route,
     focused,
     toggleFocus,
     verticalBounds,
     ...viewProps
   } = props;
 
   let timestamp = null;
   if (focused || item.startsConversation) {
     timestamp = (
       <Timestamp time={item.messageInfo.time} display="lowContrast" />
     );
   }
 
   const styles = useStyles(unboundStyles);
   let inlineSidebar = null;
   if (item.threadCreatedFromMessage) {
     inlineSidebar = (
       <View style={styles.sidebar}>
         <InlineSidebar
           threadInfo={item.threadCreatedFromMessage}
           positioning="center"
         />
       </View>
     );
   }
 
   const keyboardState = React.useContext(KeyboardContext);
   const key = messageKey(item.messageInfo);
   const onPress = React.useCallback(() => {
     const didDismiss =
       keyboardState && keyboardState.dismissKeyboardIfShowing();
     if (!didDismiss) {
       toggleFocus(key);
     }
   }, [keyboardState, toggleFocus, key]);
 
   const overlayContext = React.useContext(OverlayContext);
   const viewRef = React.useRef<?React.ElementRef<typeof View>>();
 
   const canCreateSidebarFromMessage = useCanCreateSidebarFromMessage(
     item.threadInfo,
     item.messageInfo,
   );
   const visibleEntryIDs = React.useMemo(() => {
     if (item.threadCreatedFromMessage) {
       return ['open_sidebar'];
     } else if (canCreateSidebarFromMessage) {
       return ['create_sidebar'];
     }
     return [];
   }, [item.threadCreatedFromMessage, canCreateSidebarFromMessage]);
 
   const openRobotextTooltipModal = React.useCallback(
     (x, y, width, height, pageX, pageY) => {
       invariant(
         verticalBounds,
         'verticalBounds should be present in openRobotextTooltipModal',
       );
       const coordinates = { x: pageX, y: pageY, width, height };
 
       const messageTop = pageY;
       const messageBottom = pageY + height;
       const boundsTop = verticalBounds.y;
       const boundsBottom = verticalBounds.y + verticalBounds.height;
 
       const belowMargin = 20;
       const belowSpace = robotextMessageTooltipHeight + belowMargin;
       const { isViewer } = item.messageInfo.creator;
       const aboveMargin = isViewer ? 30 : 50;
       const aboveSpace = robotextMessageTooltipHeight + aboveMargin;
 
       let location = 'below',
         margin = 0;
       if (
         messageBottom + belowSpace > boundsBottom &&
         messageTop - aboveSpace > boundsTop
       ) {
         location = 'above';
         margin = aboveMargin;
       }
 
       props.navigation.navigate({
         name: RobotextMessageTooltipModalRouteName,
         params: {
           presentedFrom: props.route.key,
           initialCoordinates: coordinates,
           verticalBounds,
           visibleEntryIDs,
           location,
           margin,
           item,
         },
         key: getMessageTooltipKey(item),
       });
     },
     [item, props.navigation, props.route.key, verticalBounds, visibleEntryIDs],
   );
 
   const onLongPress = React.useCallback(() => {
     if (keyboardState && keyboardState.dismissKeyboardIfShowing()) {
       return;
     }
 
     if (visibleEntryIDs.length === 0) {
       return;
     }
 
     if (!viewRef.current || !verticalBounds) {
       return;
     }
 
     if (!focused) {
       toggleFocus(messageKey(item.messageInfo));
     }
 
     invariant(overlayContext, 'RobotextMessage should have OverlayContext');
     overlayContext.setScrollBlockingModalStatus('open');
     viewRef.current?.measure(openRobotextTooltipModal);
   }, [
     focused,
     item,
     keyboardState,
     overlayContext,
     toggleFocus,
     verticalBounds,
     viewRef,
     visibleEntryIDs,
     openRobotextTooltipModal,
   ]);
 
   const onLayout = React.useCallback(() => {}, []);
 
   const contentAndHeaderOpacity = useContentAndHeaderOpacity(item);
 
   return (
     <View {...viewProps}>
       <AnimatedView style={{ opacity: contentAndHeaderOpacity }}>
         {timestamp}
       </AnimatedView>
       <View onLayout={onLayout} ref={viewRef}>
         <AnimatedView style={{ opacity: contentAndHeaderOpacity }}>
           <InnerRobotextMessage
             item={item}
             onPress={onPress}
             onLongPress={onLongPress}
           />
         </AnimatedView>
         {inlineSidebar}
       </View>
     </View>
   );
 }
 
 const unboundStyles = {
   sidebar: {
     marginTop: -5,
     marginBottom: 5,
   },
 };
 
 export { RobotextMessage };
diff --git a/native/chat/utils.js b/native/chat/utils.js
index 1b0c4d1bd..d7c5bbdef 100644
--- a/native/chat/utils.js
+++ b/native/chat/utils.js
@@ -1,412 +1,412 @@
 // @flow
 
 import invariant from 'invariant';
 import * as React from 'react';
 import Animated from 'react-native-reanimated';
 
 import { useMessageListData } from 'lib/selectors/chat-selectors';
 import { messageKey } from 'lib/shared/message-utils';
 import { colorIsDark, viewerIsMember } from 'lib/shared/thread-utils';
 import type { ThreadInfo } from 'lib/types/thread-types';
 
 import { KeyboardContext } from '../keyboard/keyboard-state';
 import { OverlayContext } from '../navigation/overlay-context';
 import {
   MultimediaMessageTooltipModalRouteName,
   RobotextMessageTooltipModalRouteName,
   TextMessageTooltipModalRouteName,
 } from '../navigation/route-names';
 import { useSelector } from '../redux/redux-utils';
 import type {
   ChatMessageInfoItemWithHeight,
   ChatMessageItemWithHeight,
   ChatRobotextMessageInfoItemWithHeight,
   ChatTextMessageInfoItemWithHeight,
 } from '../types/chat-types';
 import type { LayoutCoordinates, VerticalBounds } from '../types/layout-types';
 import type { AnimatedViewStyle } from '../types/styles';
 import { ChatContext, useHeightMeasurer } from './chat-context';
 import { clusterEndHeight } from './composed-message.react';
 import { failedSendHeight } from './failed-send.react';
 import {
   inlineSidebarHeight,
   inlineSidebarMarginBottom,
   inlineSidebarMarginTop,
-} from './inline-sidebar.react';
+} from './inline-sidebar-constants';
 import { authorNameHeight } from './message-header.react';
 import { multimediaMessageItemHeight } from './multimedia-message-utils';
 import { getSidebarThreadInfo } from './sidebar-navigation';
 import textMessageSendFailed from './text-message-send-failed';
 import { timestampHeight } from './timestamp.react';
 
 /* eslint-disable import/no-named-as-default-member */
 const {
   Node,
   Extrapolate,
   interpolateNode,
   interpolateColors,
   block,
   call,
   eq,
   cond,
   sub,
 } = Animated;
 /* eslint-enable import/no-named-as-default-member */
 
 function textMessageItemHeight(
   item: ChatTextMessageInfoItemWithHeight,
 ): number {
   const { messageInfo, contentHeight, startsCluster, endsCluster } = item;
   const { isViewer } = messageInfo.creator;
   let height = 5 + contentHeight; // 5 from marginBottom in ComposedMessage
   if (!isViewer && startsCluster) {
     height += authorNameHeight;
   }
   if (endsCluster) {
     height += clusterEndHeight;
   }
   if (textMessageSendFailed(item)) {
     height += failedSendHeight;
   }
   if (item.threadCreatedFromMessage) {
     height +=
       inlineSidebarHeight + inlineSidebarMarginTop + inlineSidebarMarginBottom;
   }
   return height;
 }
 
 function robotextMessageItemHeight(
   item: ChatRobotextMessageInfoItemWithHeight,
 ): number {
   if (item.threadCreatedFromMessage) {
     return item.contentHeight + inlineSidebarHeight;
   }
   return item.contentHeight;
 }
 
 function messageItemHeight(item: ChatMessageInfoItemWithHeight): number {
   let height = 0;
   if (item.messageShapeType === 'text') {
     height += textMessageItemHeight(item);
   } else if (item.messageShapeType === 'multimedia') {
     height += multimediaMessageItemHeight(item);
   } else {
     height += robotextMessageItemHeight(item);
   }
   if (item.startsConversation) {
     height += timestampHeight;
   }
   return height;
 }
 
 function chatMessageItemHeight(item: ChatMessageItemWithHeight): number {
   if (item.itemType === 'loader') {
     return 56;
   }
   return messageItemHeight(item);
 }
 
 function useMessageTargetParameters(
   sourceMessage: ChatMessageInfoItemWithHeight,
   initialCoordinates: LayoutCoordinates,
   messageListVerticalBounds: VerticalBounds,
   currentInputBarHeight: number,
   targetInputBarHeight: number,
   sidebarThreadInfo: ?ThreadInfo,
 ): {
   +position: number,
   +color: string,
 } {
   const messageListData = useMessageListData({
     searching: false,
     userInfoInputArray: [],
     threadInfo: sidebarThreadInfo,
   });
 
   const [
     messagesWithHeight,
     setMessagesWithHeight,
   ] = React.useState<?$ReadOnlyArray<ChatMessageItemWithHeight>>(null);
   const measureMessages = useHeightMeasurer();
 
   React.useEffect(() => {
     if (messageListData) {
       measureMessages(
         messageListData,
         sidebarThreadInfo,
         setMessagesWithHeight,
       );
     }
   }, [measureMessages, messageListData, sidebarThreadInfo]);
 
   const sourceMessageID = sourceMessage.messageInfo?.id;
   const targetDistanceFromBottom = React.useMemo(() => {
     if (!messagesWithHeight) {
       return 0;
     }
 
     let offset = 0;
     for (const message of messagesWithHeight) {
       offset += chatMessageItemHeight(message);
       if (message.messageInfo && message.messageInfo.id === sourceMessageID) {
         return offset;
       }
     }
 
     return (
       messageListVerticalBounds.height + chatMessageItemHeight(sourceMessage)
     );
   }, [
     messageListVerticalBounds.height,
     messagesWithHeight,
     sourceMessage,
     sourceMessageID,
   ]);
 
   if (!sidebarThreadInfo) {
     return {
       position: 0,
       color: sourceMessage.threadInfo.color,
     };
   }
 
   const authorNameComponentHeight = sourceMessage.messageInfo.creator.isViewer
     ? 0
     : authorNameHeight;
   const currentDistanceFromBottom =
     messageListVerticalBounds.height +
     messageListVerticalBounds.y -
     initialCoordinates.y +
     timestampHeight +
     authorNameComponentHeight +
     currentInputBarHeight;
   return {
     position:
       targetDistanceFromBottom +
       targetInputBarHeight -
       currentDistanceFromBottom,
     color: sidebarThreadInfo.color,
   };
 }
 
 type AnimatedMessageArgs = {
   +sourceMessage: ChatMessageInfoItemWithHeight,
   +initialCoordinates: LayoutCoordinates,
   +messageListVerticalBounds: VerticalBounds,
   +progress: Node,
   +targetInputBarHeight: ?number,
 };
 
 function useAnimatedMessageTooltipButton({
   sourceMessage,
   initialCoordinates,
   messageListVerticalBounds,
   progress,
   targetInputBarHeight,
 }: AnimatedMessageArgs): {
   +style: AnimatedViewStyle,
   +threadColorOverride: ?Node,
   +isThreadColorDarkOverride: ?boolean,
 } {
   const chatContext = React.useContext(ChatContext);
   invariant(chatContext, 'chatContext should be set');
   const {
     currentTransitionSidebarSourceID,
     setCurrentTransitionSidebarSourceID,
     chatInputBarHeights,
     sidebarAnimationType,
     setSidebarAnimationType,
   } = chatContext;
 
   const viewerID = useSelector(
     state => state.currentUserInfo && state.currentUserInfo.id,
   );
   const sidebarThreadInfo = React.useMemo(() => {
     return getSidebarThreadInfo(sourceMessage, viewerID);
   }, [sourceMessage, viewerID]);
 
   const currentInputBarHeight =
     chatInputBarHeights.get(sourceMessage.threadInfo.id) ?? 0;
   const keyboardState = React.useContext(KeyboardContext);
   const viewerIsSidebarMember = viewerIsMember(sidebarThreadInfo);
   React.useEffect(() => {
     const newSidebarAnimationType =
       !currentInputBarHeight ||
       !targetInputBarHeight ||
       keyboardState?.keyboardShowing ||
       !viewerIsSidebarMember
         ? 'fade_source_message'
         : 'move_source_message';
     setSidebarAnimationType(newSidebarAnimationType);
   }, [
     currentInputBarHeight,
     keyboardState?.keyboardShowing,
     setSidebarAnimationType,
     sidebarThreadInfo,
     targetInputBarHeight,
     viewerIsSidebarMember,
   ]);
 
   const {
     position: targetPosition,
     color: targetColor,
   } = useMessageTargetParameters(
     sourceMessage,
     initialCoordinates,
     messageListVerticalBounds,
     currentInputBarHeight,
     targetInputBarHeight ?? currentInputBarHeight,
     sidebarThreadInfo,
   );
 
   React.useEffect(() => {
     return () => setCurrentTransitionSidebarSourceID(null);
   }, [setCurrentTransitionSidebarSourceID]);
 
   const bottom = React.useMemo(
     () =>
       interpolateNode(progress, {
         inputRange: [0.3, 1],
         outputRange: [targetPosition, 0],
         extrapolate: Extrapolate.CLAMP,
       }),
     [progress, targetPosition],
   );
 
   const [
     isThreadColorDarkOverride,
     setThreadColorDarkOverride,
   ] = React.useState<?boolean>(null);
   const setThreadColorBrightness = React.useCallback(() => {
     const isSourceThreadDark = colorIsDark(sourceMessage.threadInfo.color);
     const isTargetThreadDark = colorIsDark(targetColor);
     if (isSourceThreadDark !== isTargetThreadDark) {
       setThreadColorDarkOverride(isTargetThreadDark);
     }
   }, [sourceMessage.threadInfo.color, targetColor]);
 
   const threadColorOverride = React.useMemo(() => {
     if (
       sourceMessage.messageShapeType !== 'text' ||
       !currentTransitionSidebarSourceID
     ) {
       return null;
     }
     return block([
       cond(eq(progress, 1), call([], setThreadColorBrightness)),
       interpolateColors(progress, {
         inputRange: [0, 1],
         outputColorRange: [
           `#${targetColor}`,
           `#${sourceMessage.threadInfo.color}`,
         ],
       }),
     ]);
   }, [
     currentTransitionSidebarSourceID,
     progress,
     setThreadColorBrightness,
     sourceMessage.messageShapeType,
     sourceMessage.threadInfo.color,
     targetColor,
   ]);
 
   const messageContainerStyle = React.useMemo(() => {
     return {
       bottom: currentTransitionSidebarSourceID ? bottom : 0,
       opacity:
         currentTransitionSidebarSourceID &&
         sidebarAnimationType === 'fade_source_message'
           ? 0
           : 1,
     };
   }, [bottom, currentTransitionSidebarSourceID, sidebarAnimationType]);
 
   return {
     style: messageContainerStyle,
     threadColorOverride,
     isThreadColorDarkOverride,
   };
 }
 
 function getMessageTooltipKey(item: ChatMessageInfoItemWithHeight): string {
   return `tooltip|${messageKey(item.messageInfo)}`;
 }
 
 function isMessageTooltipKey(key: string): boolean {
   return key.startsWith('tooltip|');
 }
 
 function useOverlayPosition(item: ChatMessageInfoItemWithHeight) {
   const overlayContext = React.useContext(OverlayContext);
   invariant(overlayContext, 'should be set');
 
   for (const overlay of overlayContext.visibleOverlays) {
     if (
       (overlay.routeName === MultimediaMessageTooltipModalRouteName ||
         overlay.routeName === TextMessageTooltipModalRouteName ||
         overlay.routeName === RobotextMessageTooltipModalRouteName) &&
       overlay.routeKey === getMessageTooltipKey(item)
     ) {
       return overlay.position;
     }
   }
   return undefined;
 }
 
 function useContentAndHeaderOpacity(
   item: ChatMessageInfoItemWithHeight,
 ): number | Node {
   const overlayPosition = useOverlayPosition(item);
   const chatContext = React.useContext(ChatContext);
   return React.useMemo(
     () =>
       overlayPosition &&
       chatContext?.sidebarAnimationType === 'move_source_message'
         ? sub(
             1,
             interpolateNode(overlayPosition, {
               inputRange: [0.05, 0.06],
               outputRange: [0, 1],
               extrapolate: Extrapolate.CLAMP,
             }),
           )
         : 1,
     [chatContext?.sidebarAnimationType, overlayPosition],
   );
 }
 
 function useDeliveryIconOpacity(
   item: ChatMessageInfoItemWithHeight,
 ): number | Node {
   const overlayPosition = useOverlayPosition(item);
   const chatContext = React.useContext(ChatContext);
   return React.useMemo(() => {
     if (
       !overlayPosition ||
       !chatContext?.currentTransitionSidebarSourceID ||
       chatContext?.sidebarAnimationType === 'fade_source_message'
     ) {
       return 1;
     }
     return interpolateNode(overlayPosition, {
       inputRange: [0.05, 0.06, 1],
       outputRange: [1, 0, 0],
       extrapolate: Extrapolate.CLAMP,
     });
   }, [
     chatContext?.currentTransitionSidebarSourceID,
     chatContext?.sidebarAnimationType,
     overlayPosition,
   ]);
 }
 
 export {
   chatMessageItemHeight,
   useAnimatedMessageTooltipButton,
   messageItemHeight,
   getMessageTooltipKey,
   isMessageTooltipKey,
   useContentAndHeaderOpacity,
   useDeliveryIconOpacity,
 };