import { TTSProvider, TTSProviderConfig, TTSOptions, TTSResult } from '../../interfaces';
export declare class GoogleCloudTTSProvider implements TTSProvider {
    private config;
    private client;
    constructor(config: TTSProviderConfig);
    textToSpeech(text: string, outputPath: string, options?: TTSOptions): Promise<TTSResult>;
    private extractLanguageCode;
}