import { TTSProvider, SpeakOptions, VoiceInfo, SpeechError } from './types.js';
export declare class WebSpeechTTSProvider implements TTSProvider {
    readonly isSupported: boolean;
    private _startCbs;
    private _endCbs;
    private _errorCbs;
    /** Resolves with the array of available voices. Safe to call multiple times */
    private _voicesPromise;
    constructor();
    onStart(cb: () => void): void;
    onEnd(cb: () => void): void;
    onError(cb: (err: SpeechError) => void): void;
    private _emitStart;
    private _emitEnd;
    private _emitError;
    speak(options: SpeakOptions): Promise<void>;
    stop(): void;
    pause(): void;
    resume(): void;
    getVoices(): Promise<VoiceInfo[]>;
    private _loadVoices;
}