remove more spurious jQuery objects by using externs

javascript/ql/test/library-tests/frameworks/jQuery/jquery-3.2.js

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2017 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 Externs for jQuery 3.1
+ *
+ * Note that some functions use different return types depending on the number
+ * of parameters passed in. In these cases, you may need to annotate the type
+ * of the result in your code, so the JSCompiler understands which type you're
+ * expecting. For example:
+ *    <code>var elt = /** @type {Element} * / (foo.get(0));</code>
+ *
+ * @see http://api.jquery.com/
+ * @externs
+ */
+
+/**
+ * @typedef {(Window|Document|Element|Array<Element>|string|jQuery|
+ *     NodeList)}
+ */
+var jQuerySelector;
+
+/**
+ * @constructor
+ * @param {(jQuerySelector|Object|function())=} arg1
+ * @param {(Element|jQuery|Document|
+ *     Object<string, (string|function(!jQuery.Event))>)=} arg2
+ * @throws {Error} on invalid selector
+ * @return {!jQuery}
+ * @implements {Iterable}
+ */
+function jQuery(arg1, arg2) { };
+
+/**
+ * @const
+ */
+var $ = jQuery;
+
+/**
+ * @param {(string|jQueryAjaxSettings|Object<string,*>)} arg1
+ * @param {(jQueryAjaxSettings|Object<string, *>)=} settings
+ * @return {!jQuery.jqXHR}
+ */
+jQuery.ajax = function (arg1, settings) { };
+
+/**
+ * @param {string} str
+ * @return {string}
+ * @nosideeffects
+ */
+jQuery.trim = function (str) { };
+