/**
 * @fileoverview Minimal WAV (RIFF) encoder for raw Float32 PCM.
 *
 * The browser path gets its WAV from `convertAudioBufferToWav`, which needs a Web
 * Audio `AudioBuffer`. Node has no such thing: the Kokoro model hands back a bare
 * `Float32Array`, and long documents are synthesized one chunk at a time and
 * joined before encoding. Both of those are pure buffer work, so they live here
 * with no platform dependency.
 */
/**
 * Joins per-chunk sample buffers into one contiguous track.
 *
 * @param chunks Sample buffers in playback order.
 * @param silenceSamples Samples of silence to insert between chunks, so the
 *   seams between separately synthesized chunks do not sound clipped.
 */
export declare function concatSamples(chunks: Float32Array[], silenceSamples?: number): Float32Array;
/**
 * Encodes Float32 samples (nominally -1..1) as a 16-bit PCM WAV file.
 *
 * @param samples Interleaved samples when `channels` is greater than 1.
 * @param sampleRate Sample rate of the audio, e.g. 24000 for Kokoro.
 * @param channels Channel count. Kokoro is mono.
 */
export declare function encodeWav(samples: Float32Array, sampleRate?: number, channels?: number): ArrayBuffer;
/** Duration of a Float32 track in seconds, for progress and log lines. */
export declare function wavDurationSeconds(samples: Float32Array, sampleRate: number): number;