/**
 * Browser Speech Synthesis API adapter
 *
 * Uses the Web Speech API (SpeechSynthesis) available in most modern browsers.
 * No download required, works immediately.
 */
import type { InitState, OnProgress } from '../../core/types.js';
import type { BrowserSynthesisTTSOptions, TTSAdapter, TTSCapabilities, TTSOptions, TTSVoice } from './types.js';
/**
 * Browser Speech Synthesis adapter
 */
export declare class BrowserSynthesisTTSAdapter implements TTSAdapter {
    readonly type: "browser-synthesis";
    private _initState;
    private synthesis;
    private options;
    private voices;
    private currentUtterance;
    private startListeners;
    private endListeners;
    private errorListeners;
    private boundaryListeners;
    constructor(options?: BrowserSynthesisTTSOptions);
    get initState(): InitState;
    ensureInitialized(_onProgress?: OnProgress): Promise<void>;
    private loadVoices;
    getCapabilities(): TTSCapabilities;
    getVoices(): TTSVoice[];
    private findVoice;
    speak(text: string, options?: TTSOptions): Promise<void>;
    stop(): void;
    pause(): void;
    resume(): void;
    isSpeaking(): boolean;
    isPaused(): boolean;
    onStart(callback: () => void): () => void;
    onEnd(callback: () => void): () => void;
    onError(callback: (error: Error) => void): () => void;
    onBoundary(callback: (charIndex: number, charLength: number) => void): () => void;
    dispose(): Promise<void>;
}
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