extendscript-es5-shim/Object/defineProperties.js

a collection of useful es5-shims for Extendscript

/*
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties#Polyfill
*/
if (!Object.defineProperties) {

  Object.defineProperties = function(object, props) {

    function hasProperty(obj, prop) {
      return Object.prototype.hasOwnProperty.call(obj, prop);
    }

    function convertToDescriptor(desc) {

      if (Object(desc) !== desc) {
        throw new TypeError('Descriptor can only be an Object.');
      }


      var d = {};

      if (hasProperty(desc, "enumerable")) {
        d.enumerable = !!desc.enumerable;
      }

      if (hasProperty(desc, "configurable")) {
        d.configurable = !!desc.configurable;
      }

      if (hasProperty(desc, "value")) {
        d.value = desc.value;
      }

      if (hasProperty(desc, "writable")) {
        d.writable = !!desc.writable;
      }

      if (hasProperty(desc, "get")) {
        throw new TypeError('getters & setters can not be defined on this javascript engine');
      }

      if (hasProperty(desc, "set")) {
        throw new TypeError('getters & setters can not be defined on this javascript engine');
      }

      return d;
    }

    if (Object(object) !== object) {
      throw new TypeError('Object.defineProperties can only be called on Objects.');
    }

    if (Object(props) !== props) {
      throw new TypeError('Properties can only be an Object.');
    }

    var properties = Object(props);
    for (propName in properties) {
      if (hasOwnProperty.call(properties, propName)) {
        var descr = convertToDescriptor(properties[propName]);
        object[propName] = descr.value;
      }
    }
    return object;
  }
}