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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 2024 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.
 */

'require util/global';
'require util/polyfill';
'require es6/symbol';
'require es6/util/inherits';
'require es6/reflect/construct';


$jscomp.polyfill('Symbol.dispose', function(orig) {
  if (orig) {
    return orig;
  }
  return Symbol('Symbol.dispose');
  // probably ES2025
}, 'es_next', 'es3');

$jscomp.polyfill('Symbol.asyncDispose', function(orig) {
  if (orig) {
    return orig;
  }
  return Symbol('Symbol.asyncDispose');
  // probably ES2025
}, 'es_next', 'es3');

$jscomp.polyfill('SuppressedError', function(orig) {
  if (orig) {
    return orig;
  }
  /**
   * @constructor
   * @extends {Error}
   * @param {*} error The error that resulted in a suppression.
   * @param {*} suppressed The error that was suppressed.
   * @param {string=} message The message for the error.
   * @return {!SuppressedError}
   */
  function SuppressedError(error, suppressed, message) {
    // Support being called without `new`.
    if (!(this instanceof SuppressedError)) {
      return new SuppressedError(error, suppressed, message);
    }
    // Create a new error object just so we can copy its stack trace into ours,
    // if appropriate. Include the message, because v8 & possibly other engines
    // include the message in the stack trace they create.
    var tmpError = Error(message);
    if ('stack' in tmpError) {
      // Old versions of IE Don't set stack until the object is thrown, and
      // won't set it then if it already exists on the object. Hence,
      // conditionally setting it here.
      this.stack = tmpError.stack;
    }
    this.message = tmpError.message;
    /** @type {*} */
    this.error = error;
    /** @type {*} */
    this.suppressed = suppressed;
  }
  $jscomp.inherits(SuppressedError, Error);
  /**
   * Error name, defaults to SuppressedError.
   *
   * @type {string}
   * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/name
   * @override
   */
  SuppressedError.prototype.name = 'SuppressedError';

  return SuppressedError;
  // probably ES2025
}, 'es_next', 'es3');