feat: add support for ai generated messages

examples/vite/src/App.tsx

@@ -1,5 +1,6 @@
 import { ChannelFilters, ChannelOptions, ChannelSort } from 'stream-chat';
 import {
+  AIStateIndicator,
   Channel,
   ChannelAvatar,
   ChannelHeader,
@@ -88,6 +89,7 @@ const App = () => {
             <Window>
               <ChannelHeader Avatar={ChannelAvatar} />
               <MessageList returnAllReadData />
+              <AIStateIndicator />
               <MessageInput focus />
             </Window>
             <Thread virtualized />

examples/vite/src/index.scss

@@ -29,6 +29,7 @@ body,
     width: 0;
     flex-shrink: 0;
     box-shadow: 0 0 8px rgba(0, 0, 0, 0.15);
+    max-width: 1000px;
 
     &--open {
       width: 30%;

package.json

@@ -145,7 +145,7 @@
     "emoji-mart": "^5.4.0",
     "react": "^18.0.0 || ^17.0.0 || ^16.8.0",
     "react-dom": "^18.0.0 || ^17.0.0 || ^16.8.0",
-    "stream-chat": "^8.45.0"
+    "stream-chat": "^8.46.0"
   },
   "peerDependenciesMeta": {
     "@breezystack/lamejs": {
@@ -186,7 +186,7 @@
     "@semantic-release/changelog": "^6.0.2",
     "@semantic-release/git": "^10.0.1",
     "@stream-io/rollup-plugin-node-builtins": "^2.1.5",
-    "@stream-io/stream-chat-css": "^5.4.0",
+    "@stream-io/stream-chat-css": "^5.5.0",
     "@testing-library/jest-dom": "^6.1.4",
     "@testing-library/react": "^13.1.1",
     "@testing-library/react-hooks": "^8.0.0",
@@ -255,7 +255,7 @@
     "react-dom": "^18.1.0",
     "react-test-renderer": "^18.1.0",
     "semantic-release": "^19.0.5",
-    "stream-chat": "^8.45.0",
+    "stream-chat": "^8.46.0",
     "ts-jest": "^29.1.4",
     "typescript": "^5.4.5"
   },

src/components/AIStateIndicator/AIStateIndicator.tsx

@@ -0,0 +1,37 @@
+import React from 'react';
+
+import { Channel } from 'stream-chat';
+
+import { AIStates, useAIState } from './hooks/useAIState';
+
+import { useChannelStateContext, useTranslationContext } from '../../context';
+import type { DefaultStreamChatGenerics } from '../../types/types';
+
+export type AIStateIndicatorProps<
+  StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
+> = {
+  channel?: Channel<StreamChatGenerics>;
+};
+
+export const AIStateIndicator = <
+  StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
+>({
+  channel: channelFromProps,
+}: AIStateIndicatorProps<StreamChatGenerics>) => {
+  const { t } = useTranslationContext();
+  const { channel: channelFromContext } = useChannelStateContext<StreamChatGenerics>(
+    'AIStateIndicator',
+  );
+  const channel = channelFromProps || channelFromContext;
+  const { aiState } = useAIState(channel);
+  const allowedStates = {
+    [AIStates.Thinking]: t('Thinking...'),
+    [AIStates.Generating]: t('Generating...'),
+  };
+
+  return aiState in allowedStates ? (
+    <div className='str-chat__ai-state-indicator-container'>
+      <p className='str-chat__ai-state-indicator-text'>{allowedStates[aiState]}</p>
+    </div>
+  ) : null;
+};

src/components/AIStateIndicator/hooks/useAIState.ts

@@ -0,0 +1,57 @@
+import { useEffect, useState } from 'react';
+
+import { AIState, Channel, Event } from 'stream-chat';
+
+import type { DefaultStreamChatGenerics } from '../../../types/types';
+
+export const AIStates = {
+  Error: 'AI_STATE_ERROR',
+  ExternalSources: 'AI_STATE_EXTERNAL_SOURCES',
+  Generating: 'AI_STATE_GENERATING',
+  Idle: 'AI_STATE_IDLE',
+  Thinking: 'AI_STATE_THINKING',
+};
+
+/**
+ * A hook that returns the current state of the AI.
+ * @param {Channel} channel - The channel for which we want to know the AI state.
+ * @returns {{ aiState: AIState }} The current AI state for the given channel.
+ */
+export const useAIState = <
+  StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
+>(
+  channel?: Channel<StreamChatGenerics>,
+): { aiState: AIState } => {
+  const [aiState, setAiState] = useState<AIState>(AIStates.Idle);
+
+  useEffect(() => {
+    if (!channel) {
+      return;
+    }
+
+    const indicatorChangedListener = channel.on(
+      'ai_indicator.update',
+      (event: Event<StreamChatGenerics>) => {
+        const { cid } = event;
+        const state = event.ai_state as AIState;
+        if (channel.cid === cid) {
+          setAiState(state);
+        }
+      },
+    );
+
+    const indicatorClearedListener = channel.on('ai_indicator.clear', (event) => {
+      const { cid } = event;
+      if (channel.cid === cid) {
+        setAiState(AIStates.Idle);
+      }
+    });
+
+    return () => {
+      indicatorChangedListener.unsubscribe();
+      indicatorClearedListener.unsubscribe();
+    };
+  }, [channel]);
+
+  return { aiState };
+};

src/components/AIStateIndicator/index.ts

@@ -0,0 +1,2 @@
+export * from './AIStateIndicator';
+export * from './hooks/useAIState';

src/components/Channel/Channel.tsx

@@ -161,6 +161,8 @@ type ChannelPropsForwardedToComponentContext<
   | 'UnreadMessagesNotification'
   | 'UnreadMessagesSeparator'
   | 'VirtualMessage'
+  | 'StopAIGenerationButton'
+  | 'StreamedMessageText'
 >;
 
 const isUserResponseArray = <
@@ -1273,6 +1275,8 @@ const ChannelInner = <
       ReactionsList: props.ReactionsList,
       SendButton: props.SendButton,
       StartRecordingAudioButton: props.StartRecordingAudioButton,
+      StopAIGenerationButton: props.StopAIGenerationButton,
+      StreamedMessageText: props.StreamedMessageText,
       ThreadHead: props.ThreadHead,
       ThreadHeader: props.ThreadHeader,
       ThreadStart: props.ThreadStart,
@@ -1339,6 +1343,8 @@ const ChannelInner = <
       props.UnreadMessagesNotification,
       props.UnreadMessagesSeparator,
       props.VirtualMessage,
+      props.StopAIGenerationButton,
+      props.StreamedMessageText,
       props.emojiSearchIndex,
       props.reactionOptions,
     ],

src/components/ChannelPreview/utils.tsx

@@ -77,7 +77,9 @@ export const getLatestMessagePreview = <
   }
 
   if (previewTextToRender) {
-    return renderPreviewText(previewTextToRender);
+    return latestMessage.ai_generated
+      ? previewTextToRender
+      : renderPreviewText(previewTextToRender);
   }
 
   if (latestMessage.command) {

src/components/Message/MessageSimple.tsx

@@ -34,6 +34,7 @@ import { MessageEditedTimestamp } from './MessageEditedTimestamp';
 
 import type { MessageUIComponentProps } from './types';
 import type { DefaultStreamChatGenerics } from '../../types/types';
+import { StreamedMessageText as DefaultStreamedMessageText } from './StreamedMessageText';
 
 type MessageSimpleWithContextProps<
   StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
@@ -81,6 +82,7 @@ const MessageSimpleWithContext = <
     MessageStatus = DefaultMessageStatus,
     MessageTimestamp = DefaultMessageTimestamp,
     ReactionsList = DefaultReactionList,
+    StreamedMessageText = DefaultStreamedMessageText,
     PinIndicator,
   } = useComponentContext<StreamChatGenerics>('MessageSimple');
 
@@ -185,7 +187,11 @@ const MessageSimpleWithContext = <
               {message.attachments?.length && !message.quoted_message ? (
                 <Attachment actionHandler={handleAction} attachments={message.attachments} />
               ) : null}
-              <MessageText message={message} renderText={renderText} />
+              {message.ai_generated ? (
+                <StreamedMessageText message={message} renderText={renderText} />
+              ) : (
+                <MessageText message={message} renderText={renderText} />
+              )}
               {message.mml && (
                 <MML
                   actionHandler={handleAction}

src/components/Message/StreamedMessageText.tsx

@@ -0,0 +1,40 @@
+import React from 'react';
+
+import { MessageText, MessageTextProps } from './MessageText';
+import type { DefaultStreamChatGenerics } from '../../types/types';
+import { useMessageContext } from '../../context';
+import { useMessageTextStreaming } from './hooks';
+
+export type StreamedMessageTextProps<
+  StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
+> = Pick<MessageTextProps<StreamChatGenerics>, 'message' | 'renderText'> & {
+  renderingLetterCount?: number;
+  streamingLetterIntervalMs?: number;
+};
+
+export const StreamedMessageText = <
+  StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
+>(
+  props: StreamedMessageTextProps<StreamChatGenerics>,
+) => {
+  const {
+    message: messageFromProps,
+    renderingLetterCount,
+    renderText,
+    streamingLetterIntervalMs,
+  } = props;
+  const { message: messageFromContext } = useMessageContext<StreamChatGenerics>(
+    'StreamedMessageText',
+  );
+  const message = messageFromProps || messageFromContext;
+  const { text = '' } = message;
+  const { streamedMessageText } = useMessageTextStreaming({
+    renderingLetterCount,
+    streamingLetterIntervalMs,
+    text,
+  });
+
+  return (
+    <MessageText message={{ ...message, text: streamedMessageText }} renderText={renderText} />
+  );
+};

src/components/Message/hooks/index.ts

@@ -12,3 +12,4 @@ export * from './useRetryHandler';
 export * from './useUserHandler';
 export * from './useUserRole';
 export * from './useReactionsFetcher';
+export * from './useMessageTextStreaming';

src/components/Message/hooks/useMessageTextStreaming.ts

@@ -0,0 +1,52 @@
+import { useEffect, useRef, useState } from 'react';
+
+import type { DefaultStreamChatGenerics } from '../../../types/types';
+import type { StreamedMessageTextProps } from '../StreamedMessageText';
+
+export type UseMessageTextStreamingProps<
+  StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
+> = Pick<
+  StreamedMessageTextProps<StreamChatGenerics>,
+  'streamingLetterIntervalMs' | 'renderingLetterCount'
+> & { text: string };
+
+const DEFAULT_LETTER_INTERVAL = 30;
+const DEFAULT_RENDERING_LETTER_COUNT = 2;
+
+/**
+ * A hook that returns text in a streamed, typewriter fashion. The speed of streaming is
+ * configurable.
+ * @param {number} [streamingLetterIntervalMs=30] - The timeout between each typing animation in milliseconds.
+ * @param {number} [renderingLetterCount=2] - The number of letters to be rendered each time we update.
+ * @param {string} text - The text that we want to render in a typewriter fashion.
+ * @returns {{ streamedMessageText: string }} - A substring of the text property, up until we've finished rendering the typewriter animation.
+ */
+export const useMessageTextStreaming = <
+  StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
+>({
+  streamingLetterIntervalMs = DEFAULT_LETTER_INTERVAL,
+  renderingLetterCount = DEFAULT_RENDERING_LETTER_COUNT,
+  text,
+}: UseMessageTextStreamingProps<StreamChatGenerics>): { streamedMessageText: string } => {
+  const [streamedMessageText, setStreamedMessageText] = useState<string>(text);
+  const textCursor = useRef<number>(text.length);
+
+  useEffect(() => {
+    const textLength = text.length;
+    const interval = setInterval(() => {
+      if (!text || textCursor.current >= textLength) {
+        clearInterval(interval);
+      }
+      const newCursorValue = textCursor.current + renderingLetterCount;
+      const newText = text.substring(0, newCursorValue);
+      textCursor.current += newText.length - textCursor.current;
+      setStreamedMessageText(newText);
+    }, streamingLetterIntervalMs);
+
+    return () => {
+      clearInterval(interval);
+    };
+  }, [streamingLetterIntervalMs, renderingLetterCount, text]);
+
+  return { streamedMessageText };
+};

src/components/Message/index.ts

@@ -13,4 +13,5 @@ export * from './QuotedMessage';
 export * from './renderText';
 export * from './types';
 export * from './utils';
+export * from './StreamedMessageText';
 export type { TimestampProps } from './Timestamp';

src/components/Message/renderText/renderText.tsx

@@ -32,6 +32,13 @@ export const defaultAllowedTagNames: Array<keyof JSX.IntrinsicElements | 'emoji'
   'pre',
   'blockquote',
   'del',
+  'table',
+  'thead',
+  'tbody',
+  'th',
+  'tr',
+  'td',
+  'tfoot',
   // custom types (tagNames)
   'emoji',
   'mention',

src/components/Message/utils.tsx

@@ -494,5 +494,6 @@ export const isMessageBounced = <
 export const isMessageEdited = <
   StreamChatGenerics extends DefaultStreamChatGenerics = DefaultStreamChatGenerics
 >(
-  message: Pick<StreamMessage<StreamChatGenerics>, 'message_text_updated_at'>,
-) => !!message.message_text_updated_at;
+  message: Pick<StreamMessage<StreamChatGenerics>, 'message_text_updated_at'> &
+    Partial<Pick<StreamMessage<StreamChatGenerics>, 'ai_generated'>>,
+) => !!message.message_text_updated_at && !message.ai_generated;