phpjs/functions/var/is_buffer.js

php.js offers community built php functions in javascript

function is_buffer(vr) {
  //  discuss at: http://phpjs.org/functions/is_buffer/
  // original by: Brett Zamir (http://brett-zamir.me)
  //   example 1: is_buffer('This could be binary or a regular string as far as JavaScript knows...');
  //   returns 1: true

  return typeof vr === 'string';
}