import { TResolvedFeature } from '../../lib/defs.js';
export type TCachedAudio = {
    transcript: string;
    durationS: number;
    cachedPath: string;
};
export type TRenderedAudioMap = {
    [hash: string]: TCachedAudio;
};
export declare function preRenderFeatureProse(feature: TResolvedFeature): Promise<TRenderedAudioMap>;
export declare function getMediafileDuration(filePath: string): Promise<number>;
/**
 * Render speech to WAV using kokoro-js with late require.
 * Checks if kokoro-js is installed in the current working directory; if not, installs it locally.
 */
export declare function renderSpeech(transcript: string): Promise<string>;
export declare function renderAudio(hash: string, transcript: string, cacheDir: string): Promise<TCachedAudio>;
export declare function copyPreRenderedAudio(dir: string, renderedAudio: TRenderedAudioMap, transcript: string): {
    path: string;
    durationS: number;
};
/**
 * Play audio file using ffmpeg.
 * This replaces the TTS_PLAY option entirely.
 */
export declare function playAudioFile(audioPath: string): Promise<void>;
export declare function doExec(command: string, throwOnError?: boolean): string;
export declare function doSpawn(command: string): void;
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