import type { ChatDebugEvent, ChatDebugScenario } from './chat-debug-scenarios.js';
export type ChatDebugPlaybackSpeed = '1x' | '4x' | 'gap';
export declare function formatChatDebugTime(value: number): string;
/**
 * Virtual clock and transport controls (play/pause, seek, event stepping,
 * speed, keyboard shortcuts) for a chat debug scenario. `onFrame` reports
 * every animation-frame delta while playing and `onReset` fires whenever the
 * clock rewinds to zero. `seekRevision` advances only for explicit timeline
 * discontinuities, so diagnostics can observe playback without owning it.
 */
export declare function useChatDebugPlayback(scenarios: ChatDebugScenario[], options?: {
    onFrame?: (frameDeltaMs: number) => void;
    onReset?: () => void;
}): {
    selectedScenario: import("vue").ComputedRef<ChatDebugScenario>;
    elapsedMs: import("vue").Ref<number, number>;
    playing: import("vue").Ref<boolean, boolean>;
    speed: import("vue").Ref<ChatDebugPlaybackSpeed, ChatDebugPlaybackSpeed>;
    seekRevision: import("vue").Ref<number, number>;
    playbackState: import("vue").ComputedRef<import("./chat-debug-scenarios.js").ChatDebugPlaybackState>;
    appliedEventCount: import("vue").ComputedRef<number>;
    currentEvent: import("vue").ComputedRef<ChatDebugEvent | null>;
    progress: import("vue").ComputedRef<number>;
    seek: (nextElapsedMs: number) => void;
    restart: () => void;
    selectScenario: (id: string) => void;
    togglePlayback: () => void;
    jumpToEnd: () => void;
    stepEvent: (direction: -1 | 1) => void;
    selectSpeed: (nextSpeed: ChatDebugPlaybackSpeed) => void;
    applyManualEvent: (event: ChatDebugEvent) => void;
};