compiler.jx.tests/test-files/externals_unit_tests/type_inheritence.js

/*
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.
 *
 */

// type logic uses Object as the top of the tree
/**
 * @constructor
 */
function Object() {}

/**
 * @interface
 */
function EventTarget() {}

/**
 * @param {string} type
 * @param {EventListener|function(!Event):(boolean|undefined)} listener
 * @param {boolean} useCapture
 * @return {undefined}
 */
EventTarget.prototype.addEventListener = function(type, listener, useCapture) {};

/**
 * @constructor
 * @implements {EventTarget}
 */
function Foo () {}

/**
 * @param {boolean=} opt_useCapture
 * @override
 */
Foo.prototype.addEventListener = function(type, listener, opt_useCapture) {};

/**
 * @constructor
 * @extends {Foo}
 */
function Bar () {}


/**
 * @constructor
 * @extends {Bar}
 */
function Baz () {}