import { BaseSpeechRecognitionEngine } from './base-engine';
import { SpeechRecognitionConfig, SpeechRecognitionResult, AudioInputConfig } from '../types';
declare global {
    interface Window {
        SpeechRecognition: any;
        webkitSpeechRecognition: any;
    }
}
/**
 * Web Speech API engine for browser environments
 */
export declare class WebSpeechEngine extends BaseSpeechRecognitionEngine {
    private recognition;
    private mediaRecorder;
    private audioChunks;
    constructor();
    /**
     * Check if Web Speech API is available
     */
    isAvailable(): boolean;
    /**
     * Get supported languages (common languages supported by most browsers)
     */
    getSupportedLanguages(): string[];
    /**
     * Initialize the speech recognition engine
     */
    initialize(_config?: SpeechRecognitionConfig): Promise<void>;
    /**
     * Start listening for speech
     */
    startListening(config?: SpeechRecognitionConfig): Promise<void>;
    /**
     * Stop listening for speech
     */
    stopListening(): Promise<void>;
    /**
     * Start speech recognition
     */
    start(audioConfig: AudioInputConfig, recognitionConfig?: SpeechRecognitionConfig): Promise<void>;
    /**
     * Initialize speech recognition instance
     */
    private initializeRecognition;
    /**
     * Start microphone recognition
     */
    private startMicrophoneRecognition;
    /**
     * Process audio file (requires MediaRecorder API)
     */
    private processAudioFile;
    /**
     * Stop speech recognition
     */
    stop(): Promise<void>;
    /**
     * Abort speech recognition
     */
    abort(): Promise<void>;
    /**
     * Process audio file directly (not supported by Web Speech API)
     */
    processFile(_file: File, _config?: SpeechRecognitionConfig): Promise<SpeechRecognitionResult[]>;
    /**
     * Process audio stream (not supported by Web Speech API)
     */
    processStream(_stream: NodeJS.ReadableStream, _config?: SpeechRecognitionConfig): Promise<SpeechRecognitionResult[]>;
    /**
     * Get available audio input devices
     */
    static getAudioDevices(): Promise<MediaDeviceInfo[]>;
    /**
     * Check browser compatibility
     */
    static getBrowserSupport(): {
        supported: boolean;
        features: string[];
    };
}
//# sourceMappingURL=web-speech-engine.d.ts.map