Function onReaction

packages/bot/src/create-bot.ts:574–618

(evt: IncomingReaction)

          await h({ thread, user: evt.user });
      },
      async onReaction(evt: IncomingReaction) {
        // Only normalize when the adapter's platform is one the emoji table
        // knows; otherwise the raw token passes through unchanged.
        const normalized = isEmojiPlatform(adapter.platform)
          ? normalizeEmoji(evt.rawEmoji, adapter.platform)
          : undefined;
        const value: EmojiValue = normalized ?? evt.rawEmoji;
        const thread = makeThread(
          adapter,
          evt.replyTarget,
          evt.conversationKey,
        );
        // Prefer the adapter's update-capable ref; fall back to the bare id.
        const messageRef: MessageRef = evt.messageRef ?? { id: evt.messageId };
        const reactionEvt: ReactionEvent = {
          emoji: value,
          rawEmoji: evt.rawEmoji,
          added: evt.added,
          user: evt.user,
          messageId: evt.messageId,
          messageRef,
          threadId: evt.threadId,
          thread,
          adapter,
          raw: evt.raw,
        };
        for (const reg of reactionHandlers) {
          if (!reg.emojis || reg.emojis.has(value))
            await reg.handler(reactionEvt);
        }
        // Per-message handler set via `<Message onReaction>` on the posted
        // message — hot cache, falling back to the durable snapshot after a restart.
        const perMessage = await registry.resolveMessageReaction(evt.messageId);
        if (perMessage) {
          await perMessage(value, {
            emoji: value,
            rawEmoji: evt.rawEmoji,
            added: evt.added,
            user: evt.user,
            messageId: evt.messageId,
            thread,
            messageRef,
          });
        }
      },
      async onModalSubmit(evt: IncomingModalSubmit) {
        const handler = modalSubmitHandlers.get(evt.callbackId);
        if (!handler) return; // unregistered → closes