/**
 * Cartesia streaming TTS provider.
 *
 * Uses the Cartesia WS endpoint (`wss://api.cartesia.ai/tts/websocket`).
 * `sonic-2` is the v1.12 default — Cartesia's flagship low-latency model.
 *
 * Pricing: per character. Rates registered in `model-pricing.ts` under
 * provider `cartesia`.
 */
import type { TtsProvider, TtsSynthesisOptions, TtsSynthesisUsage } from './voice-tts.js';
export interface CartesiaTtsProviderOptions {
    apiKey: string;
    /** Default voice id when `synthesize` doesn't override. */
    defaultVoice?: string;
    /** Model id. Default `sonic-2`. */
    model?: string;
    /** Cartesia API version. Default `2024-11-13`. */
    apiVersion?: string;
    /** Override base URL. */
    baseUrl?: string;
    /** Provider name override. Default `cartesia`. */
    name?: string;
}
export declare class CartesiaTtsProvider implements TtsProvider {
    readonly name: string;
    private readonly apiKey;
    private readonly defaultVoice;
    private readonly model;
    private readonly apiVersion;
    private readonly baseUrl;
    private last?;
    constructor(options: CartesiaTtsProviderOptions);
    lastUsage(): TtsSynthesisUsage | undefined;
    synthesize(text: string, opts?: TtsSynthesisOptions): AsyncIterable<Uint8Array>;
}
//# sourceMappingURL=voice-tts-cartesia.d.ts.map