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diff --git a/web/modals/threads/subchannels/subchannels-modal.css b/web/modals/threads/subchannels/subchannels-modal.css
--- a/web/modals/threads/subchannels/subchannels-modal.css
+++ b/web/modals/threads/subchannels/subchannels-modal.css
@@ -1,3 +1,16 @@
+div.subchannelsListContainer {
+ display: flex;
+ flex-direction: column;
+ overflow: scroll;
+ line-height: var(--line-height-text);
+ color: var(--subchannels-modal-color);
+ row-gap: 8px;
+}
+
+div.noSubchannels {
+ text-align: center;
+}
+
div.subchannelContainer {
cursor: pointer;
display: flex;
diff --git a/web/modals/threads/subchannels/subchannels-modal.react.js b/web/modals/threads/subchannels/subchannels-modal.react.js
new file mode 100644
--- /dev/null
+++ b/web/modals/threads/subchannels/subchannels-modal.react.js
@@ -0,0 +1,99 @@
+// @flow
+
+import * as React from 'react';
+
+import { useFilteredChatListData } from 'lib/selectors/chat-selectors';
+import { threadSearchIndex } from 'lib/selectors/nav-selectors';
+import { childThreadInfos } from 'lib/selectors/thread-selectors';
+import { threadIsChannel } from 'lib/shared/thread-utils';
+
+import { useSelector } from '../../../redux/redux-utils';
+import SearchModal from '../../search-modal.react';
+import Subchannel from './subchannel.react';
+import css from './subchannels-modal.css';
+
+type ContentProps = {
+ +searchText: string,
+ +threadID: string,
+};
+
+function SubchannelsModalContent(props: ContentProps): React.Node {
+ const { searchText, threadID } = props;
+ const childThreads = useSelector(state => childThreadInfos(state)[threadID]);
+ const subchannelIDs = React.useMemo(() => {
+ if (!childThreads) {
+ return new Set();
+ }
+ return new Set(
+ childThreads.filter(threadIsChannel).map(threadInfo => threadInfo.id),
+ );
+ }, [childThreads]);
+
+ const filterSubchannels = React.useCallback(
+ thread => subchannelIDs.has(thread?.id),
+ [subchannelIDs],
+ );
+ const allSubchannelsChatList = useFilteredChatListData(filterSubchannels);
+
+ const searchIndex = useSelector(threadSearchIndex);
+
+ const searchResultIDs = React.useMemo(
+ () => searchIndex.getSearchResults(searchText),
+ [searchIndex, searchText],
+ );
+
+ const searchTextExists = !!searchText.length;
+ const filteredSubchannelsChatList = React.useMemo(() => {
+ if (!searchTextExists) {
+ return allSubchannelsChatList;
+ }
+ return allSubchannelsChatList.filter(item =>
+ searchResultIDs.includes(item.threadInfo.id),
+ );
+ }, [allSubchannelsChatList, searchResultIDs, searchTextExists]);
+
+ const subchannels = React.useMemo(() => {
+ if (!filteredSubchannelsChatList.length) {
+ return (
+ <div className={css.noSubchannels}>
+ No matching subchannels were found in the thread!
+ </div>
+ );
+ }
+ return filteredSubchannelsChatList.map(childThreadItem => (
+ <Subchannel
+ chatThreadItem={childThreadItem}
+ key={childThreadItem.threadInfo.id}
+ />
+ ));
+ }, [filteredSubchannelsChatList]);
+
+ return <div className={css.subchannelsListContainer}>{subchannels}</div>;
+}
+type Props = {
+ +threadID: string,
+ +onClose: () => void,
+};
+
+function SubchannelsModal(props: Props): React.Node {
+ const { threadID, onClose } = props;
+
+ const subchannelsContent = React.useCallback(
+ (searchText: string) => (
+ <SubchannelsModalContent searchText={searchText} threadID={threadID} />
+ ),
+ [threadID],
+ );
+
+ return (
+ <SearchModal
+ name="Subchannels"
+ searchPlaceholder="Search"
+ onClose={onClose}
+ >
+ {subchannelsContent}
+ </SearchModal>
+ );
+}
+
+export default SubchannelsModal;

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