export type TtsLanguage = "en" | "fr";
export interface TtsVoice {
    id: string;
    label: string;
    lang: string;
}
export interface SynthesizeOptions {
    voice?: string;
    speed?: number;
    language?: TtsLanguage;
}
export interface SynthesizedAudio {
    audio: Buffer;
    format: "wav" | "mp3";
    sampleRate: number;
}
export interface TtsEngine {
    readonly id: string;
    readonly supportedLanguages: readonly TtsLanguage[];
    isAvailable(): Promise<boolean>;
    listVoices(): Promise<TtsVoice[]>;
    synthesize(text: string, opts?: SynthesizeOptions): Promise<SynthesizedAudio>;
}
export declare class TtsUnsupportedLanguageError extends Error {
    readonly language: TtsLanguage;
    readonly engine: string;
    constructor(language: TtsLanguage, engine: string);
}
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