/**
 * Alibaba DashScope TTS provider (qwen-tts model).
 *
 * Implements the SpeechProviderPlugin contract directly because DashScope's
 * response shape (output.audio.url for the audio binary, no direct stream)
 * doesn't fit the OpenAI-compatible factory.
 *
 * Implementation notes (per docs/voice-rearchitecture.md §8.4.1):
 *   - `synthesizeStream` is intentionally not implemented. Native qwen-tts
 *     streaming uses a WebSocket protocol
 *     (wss://dashscope.aliyuncs.com/api-ws/v1/inference); speak-core's stream
 *     fallback wraps `synthesize` output as a single-chunk ReadableStream so
 *     callers see the same shape.
 *   - `maxTextLength = 512` (DashScope qwen-tts hard limit). Enforced upstream
 *     via `truncateAtSentenceBoundary` before this provider sees the text.
 *   - The audio URL returned by DashScope is hosted on Alibaba's CDN (variable
 *     hostname). We do not SSRF-guard the audio fetch because:
 *       (a) the URL is provided by the same provider we already trust for the
 *           initial synthesis call,
 *       (b) it's HTTPS-only and short-lived (~5 min TTL),
 *       (c) maintaining a hostname allowlist breaks every time Alibaba rotates
 *           CDN domains.
 *     A dedicated `assertSafeUrl` for trusted-CDN responses can be added later
 *     as a hardening pass.
 */
import type { SpeechProviderPlugin } from '../speech-provider-types.js';
export declare const alibabaSpeechProvider: SpeechProviderPlugin;