TypingIndicator

This experimental, private React source-build component presents a borrowed snapshot's waiting state. Import TypingIndicator and isTyping from @threadplane/react/chat, and import the stylesheet explicitly.

import type { AgentSnapshot } from '@threadplane/core';
import { isTyping, TypingIndicator } from '@threadplane/react/chat';
import '@threadplane/react/chat/styles.css';
 
export function Waiting({ snapshot }: {
  readonly snapshot: Pick<AgentSnapshot, 'status' | 'messages'>;
}) {
  return <TypingIndicator active={isTyping(snapshot)} />;
}

isTyping returns false unless status is 'running'. While running, it returns true for an empty message list, a last user message, or a last assistant message whose string content is empty. Any assistant text, including whitespace, hides it; last tool and system messages also hide it. Only the last message matters. This bounded selector supports core's text-only messages and never changes the snapshot or owns execution.

active is required. When false, the component renders nothing and reserves no layout. When true, it displays the literal label (default Assistant is typing) and three decorative, accessibility-hidden dots. className adds root classes. All props are readonly. There are no session, owner, or command props, timers, subscriptions, automatic scrolling, or focus changes.

By default, the stable label appears in one polite, atomic status region. Token text never enters that region. Set announce={false} when another part of the application already announces submission progress: the label stays readable, with no status or live-region semantics. The native React example uses this policy to preserve its existing composer submission announcement.

The stylesheet uses optional CSS dot animation; reduced-motion preferences disable it. The label stays readable with forced colors or without CSS, and wraps in narrow and right-to-left layouts.

Default Chat derives this indicator from its existing session snapshot after the message list and before its error notice and composer. This slice does not add general run-activity slots, legacy content-array support, or complete runtime/typing parity.