/// <reference types="node" />
import * as Tp from 'thingpedia';
import * as events from 'events';
export default class SpeechSynthesizer extends events.EventEmitter {
    private _baseUrl;
    private _locale;
    private _soundCtx;
    private _queue;
    private _speaking;
    private _outputStream;
    private _sampleRate;
    private _numChannels;
    constructor(platform: Tp.BasePlatform, url?: string);
    get speaking(): boolean;
    clearQueue(): void;
    private _synth;
    say(text: string): void;
    private _silence;
    private _closeOutputStream;
    private _ensureOutputStream;
    private _sayNext;
}