How to implement Voice Activity Detection using javascript

VAD.js

//new audiocontext
let audioCtx = new (window.AudioContext || window.webkitAudioContext)();
//analyzer for the audio context
let analyser =audioCtx.createAnalyser();

//request microphone access
navigator.mediaDevices.getUserMedia({ audio: true, video: false })
.then(async (stream) => {
    //analize sound waves
    //stream source
    let source = audioCtx.createMediaStreamSource(stream);
    //analyser now can read data from the source
    source.connect(analyser);

    //set the fftSize
    analyser.fftSize = 2048;

    //get the buffer length from the analyser
    let bufferLength = analyser.frequencyBinCount;

    //create a uint8 array
    let dataArray = new Uint8Array(bufferLength)
    //call this to get the current frequency  and put it     into dataArray
    analyser.getByteFrequencyData(dataArray)

    //now handle the the dataArray, which has frequencies from 0-255 (0 ===total silence)
    //if all elements === 0 then no voice
    // call analyser.getByteFrequencyData(dataArray) as often as you want to analyze voice frequency
    // I used 5ms in my app
    handleMicSilence(dataArray);
});