audiobuffer-to-wav | convert an AudioBuffer to .wav format | Audio Utils library

const fs = require('fs');
const toWav = require('audiobuffer-to-wav');
const AudioContext = require('web-audio-api').AudioContext;
const audioContext = new AudioContext;
 let resp = fs.readFileSync('sample.m4a');

var audioStack = [];

var header = require('waveheader');

audioContext.decodeAudioData(resp, buffer => {
    let wav = toWav(buffer); 
    var chunk = new Uint8Array(wav);
    console.log(chunk); 
    fs.appendFile('bb.wav', new Buffer(chunk), function (err) {
    });

});