browser-string-arraybuffer.js

function ab2str(ab) {
  return String.fromCharCode.apply(null, new Uint16Array(ab));
}

function str2ab(str) {
  const buf = new ArrayBuffer(str.length * 2);
  const bufView = new Uint16Array(buf);
  for (let i = 0; i < str.length; i++) {
    bufView[i] = str.charCodeAt(i);
  }
  return buf;
}