/**
 * Music generation via Google Lyria 3 on the **Gemini Developer API** (NOT
 * Vertex). This is an API-KEY product, so it resolves a key from the existing
 * Gemini key pool (GEMINI_API_KEYS / GOOGLE_API_KEYS / GOOGLE_API_KEY) via
 * `fetchGeminiWithPool` — no Vertex project, no billing, just a Gemini key.
 *
 * VERIFIED LIVE (2026-06-01) against the Gemini Developer API:
 *
 *   POST https://generativelanguage.googleapis.com/v1beta/models/{MODEL}:generateContent?key={KEY}
 *   Content-Type: application/json
 *   Body: { contents: [{ parts: [ { text: "<prompt>" } , <optional image part> ] }] }
 *
 *   Optional image-to-music conditioning attaches a second part in the SAME
 *   parts array:
 *     { inlineData: { mimeType: "image/png", data: "<base64>" } }
 *
 *   Response: candidates[0].content.parts[] — find the part whose
 *   inlineData.mimeType starts with "audio/" (observed "audio/mpeg"); its
 *   inlineData.data is base64 MP3. (There is also a { text: "<instrumental>" }
 *   part which we ignore.)
 *
 * MODEL (via LYRIA3_MODEL env, default lyria-3-clip-preview):
 *   - lyria-3-clip-preview  Lyria 3, 30s clip, text + image  (default)
 *   - lyria-3-pro-preview   Lyria 3 Pro, full song up to ~184s, text + image
 *
 * Output is MP3 (audio/mpeg) — the file is always written with a `.mp3`
 * extension regardless of the requested outputPath suffix. durationMs is a
 * deterministic estimate from input.durationSec (or a model-default: 180s for
 * a 'pro' model, 30s otherwise) — true MP3 duration parsing is out of scope.
 *
 * Availability: a Gemini key is resolvable (pool size > 0 or one of the env
 * vars set); gated via the descriptor's requiresGeminiKey flag in the registry.
 */
import type { MusicBackend } from './types.js';
export declare const lyria3Backend: MusicBackend;
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