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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2014 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @fileoverview  Additional runtime functions required for transpilation from
 * ES6 to ES5 of code generated by the Dart Dev Compiler.
 *
 * Note that DDC's output cannot currently be lowered to ES3 (heavy use of
 * getters or setters, including in the runtime), so these helpers make no
 * attempt of fallback behaviour when methods like Object.getPrototypeOf or
 * Object.getOwnPropertyDescriptor are undefined (unlike helpers in es6/*.js).
 */
'require base';

/**
 * Gets a property descriptor for a target instance, skipping its class
 * and walking up the super-classes hierarchy.
 *
 * @private
 * @param {!Object} target
 * @param {!string} name
 * @return {?}
 */
$jscomp.getSuperPropertyDescriptor_ = function(target, name) {
  var getPrototypeOf = Object.getPrototypeOf;
  var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
  var cls = getPrototypeOf(target);
  while (cls != null) {
    cls = getPrototypeOf(cls);
    if (cls != null) {
      var desc = getOwnPropertyDescriptor(cls, name);
      if (desc != null) {
        return desc;
      }
    }
  }
  return undefined;
};

/**
 * Gets a property of a target instance using its super class getter or value,
 * or returns undefined if that property is not defined on any ancestor.
 *
 * @param {!Object} target
 * @param {!string} propertyName
 * @return {*}
 */
$jscomp.superGet = function(target, propertyName) {
  var desc = $jscomp.getSuperPropertyDescriptor_(target, propertyName);
  return desc && (desc.get ? desc.get.call(target) : desc.value);
};

/**
 * Sets a property on a target instance using its super setter if is defined
 * on any ancestor, or setting it as a simple property on the target otherwise.
 *
 * @template T
 * @param {!Object} target
 * @param {!string} propertyName
 * @param {T} value
 * @return {T}
 */
$jscomp.superSet = function(target, propertyName, value) {
  var desc = $jscomp.getSuperPropertyDescriptor_(target, propertyName);
  if (desc) {
    if (!desc.set) {
      throw new TypeError('No setter for super.' + propertyName);
    }
    desc.set.call(target, value);
  } else {
    target[propertyName] = value;
  }
  return value;
};