import { TokenWithExpiry } from './useGetSTTToken';
import { SpeechRecognitionCanceledEventArgs, SpeechRecognitionEventArgs } from 'microsoft-cognitiveservices-speech-sdk';

export declare const DEFAULT_SPEECH_RECOGNITION_LANGUAGE = "en-US";
export interface SttEvents {
    onstart?: () => void;
    onend?: () => void;
    onresult: (event: SpeechRecognitionEventArgs) => void;
    onerror?: (event: SpeechRecognitionCanceledEventArgs) => void;
    onrecognizing?: (event: SpeechRecognitionEventArgs) => void;
}
export interface SpeechRecognizerProps {
    events: SttEvents;
    getSTTToken: () => Promise<TokenWithExpiry>;
}
export declare class SpeechRecognizer {
    events: SttEvents;
    getSTTToken: () => Promise<TokenWithExpiry>;
    private recognizer?;
    private intervalId?;
    private isCancelled;
    private isDestroyed;
    private status;
    constructor({ events, getSTTToken }: SpeechRecognizerProps);
    private initEvents;
    private refreshToken;
    private initTokenRefreshInterval;
    init: (language: string, inputDeviceId: string) => Promise<void>;
    /**
     * Update event handlers after initialization
     */
    updateEvents: (newEvents: SttEvents) => void;
    start: () => Promise<void>;
    private stopRecognition;
    abort: () => Promise<void>;
    /**
     * Private method to wrap the recognizer.close() in a Promise
     */
    private closeRecognizer;
    /**
     * Destroy the recognizer. This is needed to avoid memory leaks.
     * If you need to use the recognizer again, you need to create a new instance.
     */
    destroy: () => Promise<void>;
}