/**
 * FlowMusic music backend — Google Lyria 3 Pro vocal songs via useapi.net.
 *
 * Unlike the instrumental-only Lyria backends (native-lyria / native-lyria3),
 * FlowMusic generates FULL VOCAL SONGS (and instrumentals): it honors
 * user-supplied `lyrics` and an `instrumental` toggle. It is an async, job-polled
 * provider, so this backend wraps the providers/flowmusic-useapi.ts transport:
 *   submit (mode:async) → poll GET /jobs/{jobid} until terminal → download the
 *   first clip's mp3 via the auth'd /music/download endpoint → write `.mp3`.
 *
 * Availability reuses the shared USEAPI_API_TOKEN (the same token as the
 * dreamina/runway routes) — gated in the registry via `requiresUseApi`, not a
 * backend-specific requiredEnv. Optional: VCLAW_FLOWMUSIC_ACCOUNT pins the
 * flowmusic.app account; VCLAW_FLOWMUSIC_GHOSTWRITER ('standard'|'pro') picks the
 * lyrics-writer when the model writes lyrics. The poll cadence is configurable
 * via VCLAW_FLOWMUSIC_POLL_INTERVAL_MS / VCLAW_FLOWMUSIC_POLL_MAX_ATTEMPTS
 * (tests set the interval to 0 to stay fast + offline).
 */
import type { MusicBackend } from './types.js';
export declare const flowMusicBackend: MusicBackend;
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