Create WAV file containing only silence

silence.js

function createSilence(seconds = 1) {
  const sampleRate = 8000;
  const numChannels = 1;
  const bitsPerSample = 8;

  const blockAlign = numChannels * bitsPerSample / 8;
  const byteRate = sampleRate * blockAlign;
  const dataSize = Math.ceil(seconds * sampleRate) * blockAlign;
  const chunkSize = 36 + dataSize;
  const byteLength = 8 + chunkSize;

  const buffer = new ArrayBuffer(byteLength);
  const view = new DataView(buffer);

  view.setUint32(0, 0x52494646, false);    // Chunk ID 'RIFF'
  view.setUint32(4, chunkSize, true);      // File size
  view.setUint32(8, 0x57415645, false);    // Format 'WAVE'
  view.setUint32(12, 0x666D7420, false);   // Sub-chunk 1 ID 'fmt '
  view.setUint32(16, 16, true);            // Sub-chunk 1 size
  view.setUint16(20, 1, true);             // Audio format
  view.setUint16(22, numChannels, true);   // Number of channels
  view.setUint32(24, sampleRate, true);    // Sample rate
  view.setUint32(28, byteRate, true);      // Byte rate
  view.setUint16(32, blockAlign, true);    // Block align
  view.setUint16(34, bitsPerSample, true); // Bits per sample
  view.setUint32(36, 0x64617461, false);   // Sub-chunk 2 ID 'data'
  view.setUint32(40, dataSize, true);      // Sub-chunk 2 size

  for (let offset = 44; offset < byteLength; offset++) {
    view.setUint8(offset, 128);
  }

  const blob = new Blob([view], {type: 'audio/wav'});
  const url = URL.createObjectURL(blob);

  return url;
}