/**
 * SFX / foley clip generation orchestrator.
 *
 * Thin wrapper over the audio-platform SFX backend registry (ElevenLabs Sound
 * Effects today): generates one sound-effect clip from a text prompt, writes it
 * to `projects/<slug>/artifacts/audio/sfx-<n>.mp3`, and persists an `sfx.json`
 * artifact listing every clip generated for the project (append-on-repeat).
 *
 * Pure-ish: `env`/`fetcher` are threaded through so tests run fully offline.
 * Inert (throws a clear error) when no SFX backend is configured.
 */
export declare const SFX_SCHEMA_VERSION = 1;
export interface SfxClip {
    prompt: string;
    /** Project-relative path to the generated clip. */
    path: string;
    durationMs: number;
    backendId: string;
}
export interface SfxArtifact {
    schemaVersion: typeof SFX_SCHEMA_VERSION;
    projectSlug: string;
    generatedAt: string;
    clips: SfxClip[];
}
export interface GenerateSfxOptions {
    workspaceRoot: string;
    slug: string;
    prompt: string;
    durationSec?: number;
    promptInfluence?: number;
    /** Restrict to this backend id (defaults to the first AVAILABLE SFX backend). */
    backendId?: string;
    dryRun?: boolean;
    env?: NodeJS.ProcessEnv;
    fetcher?: typeof fetch;
}
export declare function sfxArtifactPathFor(root: string, slug: string): string;
export declare function sfxAudioDirFor(root: string, slug: string): string;
export declare function readSfxArtifact(root: string, slug: string): Promise<SfxArtifact | null>;
/**
 * Generate one SFX clip and append it to the project's sfx.json. Returns the
 * new clip plus the full updated artifact.
 */
export declare function generateSfx(options: GenerateSfxOptions): Promise<{
    clip: SfxClip;
    artifact: SfxArtifact;
}>;
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