/**
 * ChatState — AI transcript FSM.
 *
 * Accumulates signaling events into a renderable chat history. The key
 * property is that an AI partial and a user partial can coexist (e.g. when
 * the user barges mid-response), and both are rendered — ordered by which
 * party spoke most recently.
 *
 * Event semantics:
 *   - `ai.response_utterance` → AI chunk; buffer into `_aiPartial`.
 *   - `ai.completion`         → AI finished. Promote partial to complete.
 *                                If `barged`, `lastSpoken` flips to user.
 *   - `ai.partial_result`     → User partial; replace `_userPartial`.
 *   - `ai.speech_detect`      → User finished. Promote partial (or insert
 *                                directly) with the server's final text.
 */
export type Speaker = 'ai' | 'user';
export type EntryState = 'partial' | 'complete';
export interface ChatEntry {
    speaker: Speaker;
    text: string;
    state: EntryState;
}
export declare class ChatState {
    private _entries;
    private _aiPartial;
    private _userPartial;
    private _lastSpoken;
    /** Invoked after any state change. Overridable by consumers. */
    onUpdate: () => void;
    /** Completed entries plus any live partials, in render order. */
    getHistory(): ChatEntry[];
    get hasAny(): boolean;
    get lastSpoken(): Speaker | null;
    reset(): void;
    onUserPartial(text: string): void;
    onUserComplete(text: string): void;
    onAiChunk(text: string): void;
    onAiComplete(text: string, barged: boolean): void;
}
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