phpjs/functions/var/is_buffer.js

php.js offers community built php functions in javascript

function is_buffer(vr) {
  // +   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';
}