export interface VoiceNarrationConfig {
    /** Speech rate (0.1 to 10, default 1) */
    rate: number;
    /** Pitch (0 to 2, default 1) */
    pitch: number;
    /** Volume (0 to 1, default 0.8) */
    volume: number;
    /** Preferred voice name (auto-detected by locale if omitted) */
    voiceName?: string;
    /** BCP 47 locale (e.g. 'pl-PL', 'en-US') */
    locale: string;
    /** Enable narration (default true) */
    enabled: boolean;
}
export interface NarrationEvent {
    type: 'start' | 'end' | 'pause' | 'resume' | 'error' | 'boundary';
    text?: string;
    charIndex?: number;
    error?: string;
}
export type NarrationCallback = (event: NarrationEvent) => void;
export declare const DEFAULT_NARRATION_CONFIG: VoiceNarrationConfig;
export declare class VoiceNarrator {
    private config;
    private synth;
    private currentUtterance;
    private listeners;
    private _speaking;
    private _paused;
    constructor(config?: Partial<VoiceNarrationConfig>);
    /** Check if TTS is available in the browser. */
    get available(): boolean;
    get speaking(): boolean;
    get paused(): boolean;
    /** Get available voices for the current locale. */
    getVoices(): SpeechSynthesisVoice[];
    /** Get all available voices. */
    getAllVoices(): SpeechSynthesisVoice[];
    /** Speak the given text. Stops any current speech first. */
    speak(text: string, locale?: string): void;
    /** Speak a tutorial step — extracts localized text. */
    speakStep(step: {
        title: string | Record<string, string>;
        content: string | Record<string, string>;
    }, locale?: string): void;
    /** Pause speech. */
    pause(): void;
    /** Resume speech. */
    resume(): void;
    /** Stop speech. */
    stop(): void;
    /** Update configuration. */
    setConfig(updates: Partial<VoiceNarrationConfig>): void;
    /** Subscribe to narration events. */
    on(callback: NarrationCallback): () => void;
    /** Dispose — stop speech and clear listeners. */
    dispose(): void;
    private selectVoice;
    private stripMarkdown;
    private emit;
}
export declare function useVoiceNarration(config?: Partial<VoiceNarrationConfig>): {
    speak: (text: string, locale?: string) => void;
    speakStep: (step: {
        title: string | Record<string, string>;
        content: string | Record<string, string>;
    }, locale?: string) => void;
    pause: () => void | undefined;
    resume: () => void | undefined;
    stop: () => void | undefined;
    speaking: boolean;
    paused: boolean;
    available: boolean;
    voices: SpeechSynthesisVoice[];
};