/**
 * ElevenLabs streaming TTS provider.
 *
 * Uses the WebSocket streaming endpoint
 * (`wss://api.elevenlabs.io/v1/text-to-speech/:voiceId/stream-input`) so
 * audio frames stream out as text arrives. PCM 16-bit little-endian at
 * configurable sample rate; μ-law 8kHz available for telephony.
 *
 * Pricing: billed per character of input text. Rates registered in
 * `model-pricing.ts` under provider `elevenlabs`.
 */
import type { TtsProvider, TtsSynthesisOptions, TtsSynthesisUsage } from './voice-tts.js';
export interface ElevenLabsTtsProviderOptions {
    apiKey: string;
    /** Default voice id when `synthesize` doesn't override. */
    defaultVoice?: string;
    /** Default model id. `eleven_turbo_v2_5` is the v1.12 default (low latency). */
    model?: string;
    /** Override base URL — useful for region-pinned deployments. */
    baseUrl?: string;
    /** Provider name override for telemetry. Default `elevenlabs`. */
    name?: string;
}
export declare class ElevenLabsTtsProvider implements TtsProvider {
    readonly name: string;
    private readonly apiKey;
    private readonly defaultVoice;
    private readonly model;
    private readonly baseUrl;
    private last?;
    constructor(options: ElevenLabsTtsProviderOptions);
    lastUsage(): TtsSynthesisUsage | undefined;
    synthesize(text: string, opts?: TtsSynthesisOptions): AsyncIterable<Uint8Array>;
}
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