/** A WAV file around raw 16-bit little-endian mono PCM. The local speech
 *  server returns PCM for each piece of text; the pieces are joined here
 *  and given one header. */
export declare function concatBytes(chunks: Uint8Array[]): Uint8Array;
export declare function wavFile(pcmChunks: Uint8Array[], sampleRate: number): Uint8Array;