Function extend

third_party/js/qunit/qunit.js:368–379

(a, b, undefOnly)

    return subset;
  }
  function extend(a, b, undefOnly) {
    for (var prop in b) {
      if (hasOwn$1.call(b, prop)) {
        if (b[prop] === undefined) {
          delete a[prop];
        } else if (!(undefOnly && typeof a[prop] !== 'undefined')) {
          a[prop] = b[prop];
        }
      }
    }
    return a;
  }
  function objectType(obj) {
    if (typeof obj === 'undefined') {
      return 'undefined';