import { Talk } from '../types/voice';
import { VoiceEngine } from './VoiceEngine';
export type ElevenLabsApplyTextNormalization = 'auto' | 'on' | 'off';
export interface ElevenLabsVoiceSettingsOptions {
    stability?: number;
    similarityBoost?: number;
    style?: number;
    useSpeakerBoost?: boolean;
    speed?: number;
}
/**
 * ElevenLabs text-to-speech engine.
 */
export declare class ElevenLabsEngine implements VoiceEngine {
    private apiEndpoint;
    private model;
    private outputFormat;
    private languageCode?;
    private voiceSettings;
    private seed?;
    private previousText?;
    private nextText?;
    private applyTextNormalization?;
    private applyLanguageTextNormalization?;
    private enableLogging?;
    /**
     * Set ElevenLabs text-to-speech API base endpoint.
     */
    setApiEndpoint(apiUrl: string): void;
    /**
     * Set ElevenLabs model ID.
     */
    setModel(model: string): void;
    /**
     * Set output format, such as mp3_44100_128.
     */
    setOutputFormat(outputFormat?: string): void;
    /**
     * Set optional language code.
     */
    setLanguageCode(languageCode?: string): void;
    /**
     * Set voice settings.
     */
    setVoiceSettings(settings: ElevenLabsVoiceSettingsOptions): void;
    setStability(value?: number): void;
    setSimilarityBoost(value?: number): void;
    setStyle(value?: number): void;
    setUseSpeakerBoost(value?: boolean): void;
    setSpeed(value?: number): void;
    setSeed(value?: number): void;
    setPreviousText(value?: string): void;
    setNextText(value?: string): void;
    setApplyTextNormalization(value?: ElevenLabsApplyTextNormalization): void;
    setApplyLanguageTextNormalization(value?: boolean): void;
    setEnableLogging(value?: boolean): void;
    fetchAudio(input: Talk, speaker: string, apiKey?: string): Promise<ArrayBuffer>;
    getTestMessage(textVoiceText?: string): string;
    private createRequestUrl;
    private createApiVoiceSettings;
    private normalizeVoiceSettings;
    private updateVoiceSetting;
    private clampZeroToOne;
    private clampNumber;
    private isApplyTextNormalization;
}