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diff --git a/node_modules/selenium-webdriver/lib/symbols.js b/node_modules/selenium-webdriver/lib/symbols.js
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+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC 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.
+
+'use strict';
+
+/**
+ * @fileoverview Defines well-known symbols used within the selenium-webdriver
+ * library.
+ */
+
+
+module.exports = {
+  /**
+   * The serialize symbol specifies a method that returns an object's serialized
+   * representation. If an object's serialized form is not immediately
+   * available, the serialize method will return a promise that will be resolved
+   * with the serialized form.
+   *
+   * Note that the described method is analgous to objects that define a
+   * `toJSON()` method, except the serialized result may be a promise, or
+   * another object with a promised property.
+   */
+  serialize: Symbol('serialize')
+};