workbox-cdn/workbox/workbox-window.dev.es5.mjs

try {
  self['workbox:window:4.3.0'] && _();
} catch (e) {} // eslint-disable-line

/*
  Copyright 2019 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
/**
 * Sends a data object to a service worker via `postMessage` and resolves with
 * a response (if any).
 *
 * A response can be set in a message handler in the service worker by
 * calling `event.ports[0].postMessage(...)`, which will resolve the promise
 * returned by `messageSW()`. If no response is set, the promise will not
 * resolve.
 *
 * @param {ServiceWorker} sw The service worker to send the message to.
 * @param {Object} data An object to send to the service worker.
 * @return {Promise<Object|undefined>}
 *
 * @memberof module:workbox-window
 */

var messageSW = function messageSW(sw, data) {
  return new Promise(function (resolve) {
    var messageChannel = new MessageChannel();

    messageChannel.port1.onmessage = function (evt) {
      return resolve(evt.data);
    };

    sw.postMessage(data, [messageChannel.port2]);
  });
};

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

function _inheritsLoose(subClass, superClass) {
  subClass.prototype = Object.create(superClass.prototype);
  subClass.prototype.constructor = subClass;
  subClass.__proto__ = superClass;
}

function _assertThisInitialized(self) {
  if (self === void 0) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return self;
}

try {
  self['workbox:core:4.3.0'] && _();
} catch (e) {} // eslint-disable-line

/*
  Copyright 2018 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
/**
 * The Deferred class composes Promises in a way that allows for them to be
 * resolved or rejected from outside the constructor. In most cases promises
 * should be used directly, but Deferreds can be necessary when the logic to
 * resolve a promise must be separate.
 *
 * @private
 */

var Deferred =
/**
 * Creates a promise and exposes its resolve and reject functions as methods.
 */
function Deferred() {
  var _this = this;

  this.promise = new Promise(function (resolve, reject) {
    _this.resolve = resolve;
    _this.reject = reject;
  });
};

/*
  Copyright 2019 Google LLC
  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
var logger = function () {
  var inGroup = false;
  var methodToColorMap = {
    debug: "#7f8c8d",
    // Gray
    log: "#2ecc71",
    // Green
    warn: "#f39c12",
    // Yellow
    error: "#c0392b",
    // Red
    groupCollapsed: "#3498db",
    // Blue
    groupEnd: null // No colored prefix on groupEnd

  };

  var print = function print(method, args) {
    var _console2;

    if (method === 'groupCollapsed') {
      // Safari doesn't print all console.groupCollapsed() arguments:
      // https://bugs.webkit.org/show_bug.cgi?id=182754
      if (/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {
        var _console;

        (_console = console)[method].apply(_console, args);

        return;
      }
    }

    var styles = ["background: " + methodToColorMap[method], "border-radius: 0.5em", "color: white", "font-weight: bold", "padding: 2px 0.5em"]; // When in a group, the workbox prefix is not displayed.

    var logPrefix = inGroup ? [] : ['%cworkbox', styles.join(';')];

    (_console2 = console)[method].apply(_console2, logPrefix.concat(args));

    if (method === 'groupCollapsed') {
      inGroup = true;
    }

    if (method === 'groupEnd') {
      inGroup = false;
    }
  };

  var api = {};

  var _arr = Object.keys(methodToColorMap);

  var _loop = function _loop() {
    var method = _arr[_i];

    api[method] = function () {
      for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
        args[_key] = arguments[_key];
      }

      print(method, args);
    };
  };

  for (var _i = 0; _i < _arr.length; _i++) {
    _loop();
  }

  return api;
}();

/*
  Copyright 2019 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
/**
 * A minimal `EventTarget` shim.
 * This is necessary because not all browsers support constructable
 * `EventTarget`, so using a real `EventTarget` will error.
 * @private
 */

var EventTargetShim =
/*#__PURE__*/
function () {
  /**
   * Creates an event listener registry
   *
   * @private
   */
  function EventTargetShim() {
    // A registry of event types to listeners.
    this._eventListenerRegistry = {};
  }
  /**
   * @param {string} type
   * @param {Function} listener
   * @private
   */


  var _proto = EventTargetShim.prototype;

  _proto.addEventListener = function addEventListener(type, listener) {
    this._getEventListenersByType(type).add(listener);
  };
  /**
   * @param {string} type
   * @param {Function} listener
   * @private
   */


  _proto.removeEventListener = function removeEventListener(type, listener) {
    this._getEventListenersByType(type).delete(listener);
  };
  /**
   * @param {Event} event
   * @private
   */


  _proto.dispatchEvent = function dispatchEvent(event) {
    event.target = this;

    this._getEventListenersByType(event.type).forEach(function (listener) {
      return listener(event);
    });
  };
  /**
   * Returns a Set of listeners associated with the passed event type.
   * If no handlers have been registered, an empty Set is returned.
   *
   * @param {string} type The event type.
   * @return {Set} An array of handler functions.
   * @private
   */


  _proto._getEventListenersByType = function _getEventListenersByType(type) {
    return this._eventListenerRegistry[type] = this._eventListenerRegistry[type] || new Set();
  };

  return EventTargetShim;
}();

/*
  Copyright 2019 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
/**
 * Returns true if two URLs have the same `.href` property. The URLS can be
 * relative, and if they are the current location href is used to resolve URLs.
 *
 * @private
 * @param {string} url1
 * @param {string} url2
 * @return {boolean}
 */

var urlsMatch = function urlsMatch(url1, url2) {
  return new URL(url1, location).href === new URL(url2, location).href;
};

/*
  Copyright 2019 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
/**
 * A minimal `Event` subclass shim.
 * This doesn't *actually* subclass `Event` because not all browsers support
 * constructable `EventTarget`, and using a real `Event` will error.
 * @private
 */

var WorkboxEvent =
/**
 * @param {string} type
 * @param {Object} props
 */
function WorkboxEvent(type, props) {
  Object.assign(this, props, {
    type: type
  });
};

function _catch(body, recover) {
  try {
    var result = body();
  } catch (e) {
    return recover(e);
  }

  if (result && result.then) {
    return result.then(void 0, recover);
  }

  return result;
}

function _async(f) {
  return function () {
    for (var args = [], i = 0; i < arguments.length; i++) {
      args[i] = arguments[i];
    }

    try {
      return Promise.resolve(f.apply(this, args));
    } catch (e) {
      return Promise.reject(e);
    }
  };
}

function _invoke(body, then) {
  var result = body();

  if (result && result.then) {
    return result.then(then);
  }

  return then(result);
}

function _await(value, then, direct) {
  if (direct) {
    return then ? then(value) : value;
  }

  if (!value || !value.then) {
    value = Promise.resolve(value);
  }

  return then ? value.then(then) : value;
}

function _awaitIgnored(value, direct) {
  if (!direct) {
    return value && value.then ? value.then(_empty) : Promise.resolve();
  }
}

function _empty() {}
// `skipWaiting()` wasn't called. This 200 amount wasn't scientifically
// chosen, but it seems to avoid false positives in my testing.

var WAITING_TIMEOUT_DURATION = 200; // The amount of time after a registration that we can reasonably conclude
// that the registration didn't trigger an update.

var REGISTRATION_TIMEOUT_DURATION = 60000;
/**
 * A class to aid in handling service worker registration, updates, and
 * reacting to service worker lifecycle events.
 *
 * @fires [message]{@link module:workbox-window.Workbox#message}
 * @fires [installed]{@link module:workbox-window.Workbox#installed}
 * @fires [waiting]{@link module:workbox-window.Workbox#waiting}
 * @fires [controlling]{@link module:workbox-window.Workbox#controlling}
 * @fires [activated]{@link module:workbox-window.Workbox#activated}
 * @fires [redundant]{@link module:workbox-window.Workbox#redundant}
 * @fires [externalinstalled]{@link module:workbox-window.Workbox#externalinstalled}
 * @fires [externalwaiting]{@link module:workbox-window.Workbox#externalwaiting}
 * @fires [externalactivated]{@link module:workbox-window.Workbox#externalactivated}
 *
 * @memberof module:workbox-window
 */

var Workbox =
/*#__PURE__*/
function (_EventTargetShim) {
  _inheritsLoose(Workbox, _EventTargetShim);

  /**
   * Creates a new Workbox instance with a script URL and service worker
   * options. The script URL and options are the same as those used when
   * calling `navigator.serviceWorker.register(scriptURL, options)`. See:
   * https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register
   *
   * @param {string} scriptURL The service worker script associated with this
   *     instance.
   * @param {Object} [registerOptions] The service worker options associated
   *     with this instance.
   */
  function Workbox(scriptURL, registerOptions) {
    var _this;

    if (registerOptions === void 0) {
      registerOptions = {};
    }

    _this = _EventTargetShim.call(this) || this;
    _this._scriptURL = scriptURL;
    _this._registerOptions = registerOptions;
    _this._updateFoundCount = 0; // Deferreds we can resolve later.

    _this._swDeferred = new Deferred();
    _this._activeDeferred = new Deferred();
    _this._controllingDeferred = new Deferred(); // Bind event handler callbacks.

    _this._onMessage = _this._onMessage.bind(_assertThisInitialized(_assertThisInitialized(_this)));
    _this._onStateChange = _this._onStateChange.bind(_assertThisInitialized(_assertThisInitialized(_this)));
    _this._onUpdateFound = _this._onUpdateFound.bind(_assertThisInitialized(_assertThisInitialized(_this)));
    _this._onControllerChange = _this._onControllerChange.bind(_assertThisInitialized(_assertThisInitialized(_this)));
    return _this;
  }
  /**
   * Registers a service worker for this instances script URL and service
   * worker options. By default this method delays registration until after
   * the window has loaded.
   *
   * @param {Object} [options]
   * @param {Function} [options.immediate=false] Setting this to true will
   *     register the service worker immediately, even if the window has
   *     not loaded (not recommended).
   */


  var _proto = Workbox.prototype;
  _proto.register = _async(function (_temp) {
    var _this2 = this;

    var _ref = _temp === void 0 ? {} : _temp,
        _ref$immediate = _ref.immediate,
        immediate = _ref$immediate === void 0 ? false : _ref$immediate;

    {
      if (_this2._registrationTime) {
        logger.error('Cannot re-register a Workbox instance after it has ' + 'been registered. Create a new instance instead.');
        return;
      }
    }

    return _invoke(function () {
      if (!immediate && document.readyState !== 'complete') {
        return _awaitIgnored(new Promise(function (res) {
          return addEventListener('load', res);
        }));
      }
    }, function () {
      // Set this flag to true if any service worker was controlling the page
      // at registration time.
      _this2._isUpdate = Boolean(navigator.serviceWorker.controller); // Before registering, attempt to determine if a SW is already controlling
      // the page, and if that SW script (and version, if specified) matches this
      // instance's script.

      _this2._compatibleControllingSW = _this2._getControllingSWIfCompatible();
      return _await(_this2._registerScript(), function (_this2$_registerScrip) {
        _this2._registration = _this2$_registerScrip;

        // If we have a compatible controller, store the controller as the "own"
        // SW, resolve active/controlling deferreds and add necessary listeners.
        if (_this2._compatibleControllingSW) {
          _this2._sw = _this2._compatibleControllingSW;

          _this2._activeDeferred.resolve(_this2._compatibleControllingSW);

          _this2._controllingDeferred.resolve(_this2._compatibleControllingSW);

          _this2._reportWindowReady(_this2._compatibleControllingSW);

          _this2._compatibleControllingSW.addEventListener('statechange', _this2._onStateChange, {
            once: true
          });
        } // If there's a waiting service worker with a matching URL before the
        // `updatefound` event fires, it likely means that this site is open
        // in another tab, or the user refreshed the page (and thus the prevoius
        // page wasn't fully unloaded before this page started loading).
        // https://developers.google.com/web/fundamentals/primers/service-workers/lifecycle#waiting


        var waitingSW = _this2._registration.waiting;

        if (waitingSW && urlsMatch(waitingSW.scriptURL, _this2._scriptURL)) {
          // Store the waiting SW as the "own" Sw, even if it means overwriting
          // a compatible controller.
          _this2._sw = waitingSW; // Run this in the next microtask, so any code that adds an event
          // listener after awaiting `register()` will get this event.

          Promise.resolve().then(function () {
            _this2.dispatchEvent(new WorkboxEvent('waiting', {
              sw: waitingSW,
              wasWaitingBeforeRegister: true
            }));

            {
              logger.warn('A service worker was already waiting to activate ' + 'before this script was registered...');
            }
          });
        } // If an "own" SW is already set, resolve the deferred.


        if (_this2._sw) {
          _this2._swDeferred.resolve(_this2._sw);
        }

        {
          logger.log('Successfully registered service worker.', _this2._scriptURL);

          if (navigator.serviceWorker.controller) {
            if (_this2._compatibleControllingSW) {
              logger.debug('A service worker with the same script URL ' + 'is already controlling this page.');
            } else {
              logger.debug('A service worker with a different script URL is ' + 'currently controlling the page. The browser is now fetching ' + 'the new script now...');
            }
          }

          var currentPageIsOutOfScope = function currentPageIsOutOfScope() {
            var scopeURL = new URL(_this2._registerOptions.scope || _this2._scriptURL, document.baseURI);
            var scopeURLBasePath = new URL('./', scopeURL.href).pathname;
            return !location.pathname.startsWith(scopeURLBasePath);
          };

          if (currentPageIsOutOfScope()) {
            logger.warn('The current page is not in scope for the registered ' + 'service worker. Was this a mistake?');
          }
        }

        _this2._registration.addEventListener('updatefound', _this2._onUpdateFound);

        navigator.serviceWorker.addEventListener('controllerchange', _this2._onControllerChange, {
          once: true
        }); // Add message listeners.

        if ('BroadcastChannel' in self) {
          _this2._broadcastChannel = new BroadcastChannel('workbox');

          _this2._broadcastChannel.addEventListener('message', _this2._onMessage);
        }

        navigator.serviceWorker.addEventListener('message', _this2._onMessage);
        return _this2._registration;
      });
    });
  });
  /**
   * Resolves to the service worker registered by this instance as soon as it
   * is active. If a service worker was already controlling at registration
   * time then it will resolve to that if the script URLs (and optionally
   * script versions) match, otherwise it will wait until an update is found
   * and activates.
   *
   * @return {Promise<ServiceWorker>}
   */

  /**
   * Resolves with a reference to a service worker that matches the script URL
   * of this instance, as soon as it's available.
   *
   * If, at registration time, there's already an active or waiting service
   * worker with a matching script URL, it will be used (with the waiting
   * service worker taking precedence over the active service worker if both
   * match, since the waiting service worker would have been registered more
   * recently).
   * If there's no matching active or waiting service worker at registration
   * time then the promise will not resolve until an update is found and starts
   * installing, at which point the installing service worker is used.
   *
   * @return {Promise<ServiceWorker>}
   */
  _proto.getSW = _async(function () {
    var _this3 = this;

    // If `this._sw` is set, resolve with that as we want `getSW()` to
    // return the correct (new) service worker if an update is found.
    return _this3._sw || _this3._swDeferred.promise;
  });
  /**
   * Sends the passed data object to the service worker registered by this
   * instance (via [`getSW()`]{@link module:workbox-window.Workbox#getSW}) and resolves
   * with a response (if any).
   *
   * A response can be set in a message handler in the service worker by
   * calling `event.ports[0].postMessage(...)`, which will resolve the promise
   * returned by `messageSW()`. If no response is set, the promise will never
   * resolve.
   *
   * @param {Object} data An object to send to the service worker
   * @return {Promise<Object>}
   */

  _proto.messageSW = _async(function (data) {
    var _this4 = this;

    return _await(_this4.getSW(), function (sw) {
      return messageSW(sw, data);
    });
  });
  /**
   * Checks for a service worker already controlling the page and returns
   * it if its script URL matchs.
   *
   * @private
   * @return {ServiceWorker|undefined}
   */

  _proto._getControllingSWIfCompatible = function _getControllingSWIfCompatible() {
    var controller = navigator.serviceWorker.controller;

    if (controller && urlsMatch(controller.scriptURL, this._scriptURL)) {
      return controller;
    }
  };
  /**
   * Registers a service worker for this instances script URL and register
   * options and tracks the time registration was complete.
   *
   * @private
   */


  _proto._registerScript = _async(function () {
    var _this5 = this;

    return _catch(function () {
      return _await(navigator.serviceWorker.register(_this5._scriptURL, _this5._registerOptions), function (reg) {
        // Keep track of when registration happened, so it can be used in the
        // `this._onUpdateFound` heuristic. Also use the presence of this
        // property as a way to see if `.register()` has been called.
        _this5._registrationTime = performance.now();
        return reg;
      });
    }, function (error) {
      {
        logger.error(error);
      } // Re-throw the error.


      throw error;
    });
  });
  /**
   * Sends a message to the passed service worker that the window is ready.
   *
   * @param {ServiceWorker} sw
   * @private
   */

  _proto._reportWindowReady = function _reportWindowReady(sw) {
    messageSW(sw, {
      type: 'WINDOW_READY',
      meta: 'workbox-window'
    });
  };
  /**
   * @private
   */


  _proto._onUpdateFound = function _onUpdateFound() {
    var installingSW = this._registration.installing; // If the script URL passed to `navigator.serviceWorker.register()` is
    // different from the current controlling SW's script URL, we know any
    // successful registration calls will trigger an `updatefound` event.
    // But if the registered script URL is the same as the current controlling
    // SW's script URL, we'll only get an `updatefound` event if the file
    // changed since it was last registered. This can be a problem if the user
    // opens up the same page in a different tab, and that page registers
    // a SW that triggers an update. It's a problem because this page has no
    // good way of knowing whether the `updatefound` event came from the SW
    // script it registered or from a registration attempt made by a newer
    // version of the page running in another tab.
    // To minimize the possibility of a false positive, we use the logic here:

    var updateLikelyTriggeredExternally = // Since we enforce only calling `register()` once, and since we don't
    // add the `updatefound` event listener until the `register()` call, if
    // `_updateFoundCount` is > 0 then it means this method has already
    // been called, thus this SW must be external
    this._updateFoundCount > 0 || // If the script URL of the installing SW is different from this
    // instance's script URL, we know it's definitely not from our
    // registration.
    !urlsMatch(installingSW.scriptURL, this._scriptURL) || // If all of the above are false, then we use a time-based heuristic:
    // Any `updatefound` event that occurs long after our registration is
    // assumed to be external.
    performance.now() > this._registrationTime + REGISTRATION_TIMEOUT_DURATION ? // If any of the above are not true, we assume the update was
    // triggered by this instance.
    true : false;

    if (updateLikelyTriggeredExternally) {
      this._externalSW = installingSW;

      this._registration.removeEventListener('updatefound', this._onUpdateFound);
    } else {
      // If the update was not triggered externally we know the installing
      // SW is the one we registered, so we set it.
      this._sw = installingSW;

      this._swDeferred.resolve(installingSW); // The `installing` state isn't something we have a dedicated
      // callback for, but we do log messages for it in development.


      {
        if (navigator.serviceWorker.controller) {
          logger.log('Updated service worker found. Installing now...');
        } else {
          logger.log('Service worker is installing...');
        }
      }
    } // Increment the `updatefound` count, so future invocations of this
    // method can be sure they were triggered externally.


    ++this._updateFoundCount; // Add a `statechange` listener regardless of whether this update was
    // triggered externally, since we have callbacks for both.

    installingSW.addEventListener('statechange', this._onStateChange);
  };
  /**
   * @private
   * @param {Event} originalEvent
   */


  _proto._onStateChange = function _onStateChange(originalEvent) {
    var _this6 = this;

    var sw = originalEvent.target;
    var state = sw.state;
    var isExternal = sw === this._externalSW;
    var eventPrefix = isExternal ? 'external' : '';
    var eventProps = {
      sw: sw,
      originalEvent: originalEvent
    };

    if (!isExternal && this._isUpdate) {
      eventProps.isUpdate = true;
    }

    this.dispatchEvent(new WorkboxEvent(eventPrefix + state, eventProps));

    if (state === 'installed') {
      // This timeout is used to ignore cases where the service worker calls
      // `skipWaiting()` in the install event, thus moving it directly in the
      // activating state. (Since all service workers *must* go through the
      // waiting phase, the only way to detect `skipWaiting()` called in the
      // install event is to observe that the time spent in the waiting phase
      // is very short.)
      // NOTE: we don't need separate timeouts for the own and external SWs
      // since they can't go through these phases at the same time.
      this._waitingTimeout = setTimeout(function () {
        // Ensure the SW is still waiting (it may now be redundant).
        if (state === 'installed' && _this6._registration.waiting === sw) {
          _this6.dispatchEvent(new WorkboxEvent(eventPrefix + 'waiting', eventProps));

          {
            if (isExternal) {
              logger.warn('An external service worker has installed but is ' + 'waiting for this client to close before activating...');
            } else {
              logger.warn('The service worker has installed but is waiting ' + 'for existing clients to close before activating...');
            }
          }
        }
      }, WAITING_TIMEOUT_DURATION);
    } else if (state === 'activating') {
      clearTimeout(this._waitingTimeout);

      if (!isExternal) {
        this._activeDeferred.resolve(sw);
      }
    }

    {
      switch (state) {
        case 'installed':
          if (isExternal) {
            logger.warn('An external service worker has installed. ' + 'You may want to suggest users reload this page.');
          } else {
            logger.log('Registered service worker installed.');
          }

          break;

        case 'activated':
          if (isExternal) {
            logger.warn('An external service worker has activated.');
          } else {
            logger.log('Registered service worker activated.');

            if (sw !== navigator.serviceWorker.controller) {
              logger.warn('The registered service worker is active but ' + 'not yet controlling the page. Reload or run ' + '`clients.claim()` in the service worker.');
            }
          }

          break;

        case 'redundant':
          if (sw === this._compatibleControllingSW) {
            logger.log('Previously controlling service worker now redundant!');
          } else if (!isExternal) {
            logger.log('Registered service worker now redundant!');
          }

          break;
      }
    }
  };
  /**
   * @private
   * @param {Event} originalEvent
   */


  _proto._onControllerChange = function _onControllerChange(originalEvent) {
    var sw = this._sw;

    if (sw === navigator.serviceWorker.controller) {
      this.dispatchEvent(new WorkboxEvent('controlling', {
        sw: sw,
        originalEvent: originalEvent
      }));

      {
        logger.log('Registered service worker now controlling this page.');
      }

      this._controllingDeferred.resolve(sw);
    }
  };
  /**
   * @private
   * @param {Event} originalEvent
   */


  _proto._onMessage = function _onMessage(originalEvent) {
    var data = originalEvent.data;
    this.dispatchEvent(new WorkboxEvent('message', {
      data: data,
      originalEvent: originalEvent
    }));
  };

  _createClass(Workbox, [{
    key: "active",
    get: function get() {
      return this._activeDeferred.promise;
    }
    /**
     * Resolves to the service worker registered by this instance as soon as it
     * is controlling the page. If a service worker was already controlling at
     * registration time then it will resolve to that if the script URLs (and
     * optionally script versions) match, otherwise it will wait until an update
     * is found and starts controlling the page.
     * Note: the first time a service worker is installed it will active but
     * not start controlling the page unless `clients.claim()` is called in the
     * service worker.
     *
     * @return {Promise<ServiceWorker>}
     */

  }, {
    key: "controlling",
    get: function get() {
      return this._controllingDeferred.promise;
    }
  }]);

  return Workbox;
}(EventTargetShim); // The jsdoc comments below outline the events this instance may dispatch:

/*
  Copyright 2019 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/

export { Workbox, messageSW };