mirror of https://github.com/jkjoy/sunpeiwen.git
621 lines
31 KiB
JavaScript
621 lines
31 KiB
JavaScript
/*
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Copyright 2019 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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import { Deferred } from 'workbox-core/_private/Deferred.js';
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import { dontWaitFor } from 'workbox-core/_private/dontWaitFor.js';
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import { logger } from 'workbox-core/_private/logger.js';
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import { messageSW } from './messageSW.js';
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import { WorkboxEventTarget } from './utils/WorkboxEventTarget.js';
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import { urlsMatch } from './utils/urlsMatch.js';
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import { WorkboxEvent } from './utils/WorkboxEvent.js';
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import './_version.js';
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// The time a SW must be in the waiting phase before we can conclude
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// `skipWaiting()` wasn't called. This 200 amount wasn't scientifically
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// chosen, but it seems to avoid false positives in my testing.
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const WAITING_TIMEOUT_DURATION = 200;
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// The amount of time after a registration that we can reasonably conclude
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// that the registration didn't trigger an update.
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const REGISTRATION_TIMEOUT_DURATION = 60000;
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// The de facto standard message that a service worker should be listening for
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// to trigger a call to skipWaiting().
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const SKIP_WAITING_MESSAGE = { type: 'SKIP_WAITING' };
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/**
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* A class to aid in handling service worker registration, updates, and
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* reacting to service worker lifecycle events.
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*
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* @fires {@link workbox-window.Workbox#message}
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* @fires {@link workbox-window.Workbox#installed}
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* @fires {@link workbox-window.Workbox#waiting}
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* @fires {@link workbox-window.Workbox#controlling}
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* @fires {@link workbox-window.Workbox#activated}
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* @fires {@link workbox-window.Workbox#redundant}
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* @memberof workbox-window
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*/
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class Workbox extends WorkboxEventTarget {
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/**
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* Creates a new Workbox instance with a script URL and service worker
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* options. The script URL and options are the same as those used when
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* calling [navigator.serviceWorker.register(scriptURL, options)](https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register).
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*
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* @param {string|TrustedScriptURL} scriptURL The service worker script
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* associated with this instance. Using a
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* [`TrustedScriptURL`](https://web.dev/trusted-types/) is supported.
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* @param {Object} [registerOptions] The service worker options associated
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* with this instance.
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*/
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// eslint-disable-next-line @typescript-eslint/ban-types
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constructor(scriptURL, registerOptions = {}) {
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super();
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this._registerOptions = {};
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this._updateFoundCount = 0;
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// Deferreds we can resolve later.
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this._swDeferred = new Deferred();
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this._activeDeferred = new Deferred();
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this._controllingDeferred = new Deferred();
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this._registrationTime = 0;
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this._ownSWs = new Set();
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/**
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* @private
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*/
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this._onUpdateFound = () => {
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// `this._registration` will never be `undefined` after an update is found.
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const registration = this._registration;
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const installingSW = registration.installing;
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// If the script URL passed to `navigator.serviceWorker.register()` is
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// different from the current controlling SW's script URL, we know any
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// successful registration calls will trigger an `updatefound` event.
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// But if the registered script URL is the same as the current controlling
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// SW's script URL, we'll only get an `updatefound` event if the file
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// changed since it was last registered. This can be a problem if the user
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// opens up the same page in a different tab, and that page registers
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// a SW that triggers an update. It's a problem because this page has no
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// good way of knowing whether the `updatefound` event came from the SW
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// script it registered or from a registration attempt made by a newer
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// version of the page running in another tab.
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// To minimize the possibility of a false positive, we use the logic here:
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const updateLikelyTriggeredExternally =
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// Since we enforce only calling `register()` once, and since we don't
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// add the `updatefound` event listener until the `register()` call, if
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// `_updateFoundCount` is > 0 then it means this method has already
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// been called, thus this SW must be external
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this._updateFoundCount > 0 ||
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// If the script URL of the installing SW is different from this
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// instance's script URL, we know it's definitely not from our
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// registration.
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!urlsMatch(installingSW.scriptURL, this._scriptURL.toString()) ||
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// If all of the above are false, then we use a time-based heuristic:
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// Any `updatefound` event that occurs long after our registration is
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// assumed to be external.
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performance.now() > this._registrationTime + REGISTRATION_TIMEOUT_DURATION
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? // If any of the above are not true, we assume the update was
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// triggered by this instance.
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true
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: false;
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if (updateLikelyTriggeredExternally) {
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this._externalSW = installingSW;
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registration.removeEventListener('updatefound', this._onUpdateFound);
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}
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else {
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// If the update was not triggered externally we know the installing
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// SW is the one we registered, so we set it.
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this._sw = installingSW;
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this._ownSWs.add(installingSW);
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this._swDeferred.resolve(installingSW);
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// The `installing` state isn't something we have a dedicated
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// callback for, but we do log messages for it in development.
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if (process.env.NODE_ENV !== 'production') {
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if (navigator.serviceWorker.controller) {
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logger.log('Updated service worker found. Installing now...');
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}
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else {
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logger.log('Service worker is installing...');
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}
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}
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}
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// Increment the `updatefound` count, so future invocations of this
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// method can be sure they were triggered externally.
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++this._updateFoundCount;
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// Add a `statechange` listener regardless of whether this update was
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// triggered externally, since we have callbacks for both.
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installingSW.addEventListener('statechange', this._onStateChange);
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};
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/**
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* @private
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* @param {Event} originalEvent
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*/
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this._onStateChange = (originalEvent) => {
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// `this._registration` will never be `undefined` after an update is found.
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const registration = this._registration;
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const sw = originalEvent.target;
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const { state } = sw;
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const isExternal = sw === this._externalSW;
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const eventProps = {
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sw,
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isExternal,
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originalEvent,
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};
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if (!isExternal && this._isUpdate) {
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eventProps.isUpdate = true;
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}
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this.dispatchEvent(new WorkboxEvent(state, eventProps));
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if (state === 'installed') {
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// This timeout is used to ignore cases where the service worker calls
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// `skipWaiting()` in the install event, thus moving it directly in the
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// activating state. (Since all service workers *must* go through the
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// waiting phase, the only way to detect `skipWaiting()` called in the
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// install event is to observe that the time spent in the waiting phase
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// is very short.)
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// NOTE: we don't need separate timeouts for the own and external SWs
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// since they can't go through these phases at the same time.
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this._waitingTimeout = self.setTimeout(() => {
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// Ensure the SW is still waiting (it may now be redundant).
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if (state === 'installed' && registration.waiting === sw) {
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this.dispatchEvent(new WorkboxEvent('waiting', eventProps));
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if (process.env.NODE_ENV !== 'production') {
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if (isExternal) {
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logger.warn('An external service worker has installed but is ' +
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'waiting for this client to close before activating...');
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}
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else {
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logger.warn('The service worker has installed but is waiting ' +
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'for existing clients to close before activating...');
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}
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}
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}
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}, WAITING_TIMEOUT_DURATION);
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}
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else if (state === 'activating') {
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clearTimeout(this._waitingTimeout);
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if (!isExternal) {
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this._activeDeferred.resolve(sw);
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}
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}
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if (process.env.NODE_ENV !== 'production') {
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switch (state) {
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case 'installed':
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if (isExternal) {
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logger.warn('An external service worker has installed. ' +
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'You may want to suggest users reload this page.');
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}
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else {
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logger.log('Registered service worker installed.');
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}
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break;
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case 'activated':
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if (isExternal) {
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logger.warn('An external service worker has activated.');
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}
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else {
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logger.log('Registered service worker activated.');
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if (sw !== navigator.serviceWorker.controller) {
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logger.warn('The registered service worker is active but ' +
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'not yet controlling the page. Reload or run ' +
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'`clients.claim()` in the service worker.');
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}
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}
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break;
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case 'redundant':
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if (sw === this._compatibleControllingSW) {
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logger.log('Previously controlling service worker now redundant!');
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}
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else if (!isExternal) {
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logger.log('Registered service worker now redundant!');
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}
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break;
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}
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}
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};
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/**
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* @private
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* @param {Event} originalEvent
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*/
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this._onControllerChange = (originalEvent) => {
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const sw = this._sw;
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const isExternal = sw !== navigator.serviceWorker.controller;
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// Unconditionally dispatch the controlling event, with isExternal set
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// to distinguish between controller changes due to the initial registration
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// vs. an update-check or other tab's registration.
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// See https://github.com/GoogleChrome/workbox/issues/2786
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this.dispatchEvent(new WorkboxEvent('controlling', {
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isExternal,
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originalEvent,
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sw,
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isUpdate: this._isUpdate,
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}));
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if (!isExternal) {
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if (process.env.NODE_ENV !== 'production') {
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logger.log('Registered service worker now controlling this page.');
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}
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this._controllingDeferred.resolve(sw);
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}
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};
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/**
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* @private
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* @param {Event} originalEvent
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*/
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this._onMessage = async (originalEvent) => {
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// Can't change type 'any' of data.
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// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
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const { data, ports, source } = originalEvent;
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// Wait until there's an "own" service worker. This is used to buffer
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// `message` events that may be received prior to calling `register()`.
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await this.getSW();
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// If the service worker that sent the message is in the list of own
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// service workers for this instance, dispatch a `message` event.
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// NOTE: we check for all previously owned service workers rather than
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// just the current one because some messages (e.g. cache updates) use
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// a timeout when sent and may be delayed long enough for a service worker
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// update to be found.
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if (this._ownSWs.has(source)) {
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this.dispatchEvent(new WorkboxEvent('message', {
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// Can't change type 'any' of data.
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// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
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data,
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originalEvent,
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ports,
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sw: source,
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}));
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}
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};
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this._scriptURL = scriptURL;
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this._registerOptions = registerOptions;
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// Add a message listener immediately since messages received during
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// page load are buffered only until the DOMContentLoaded event:
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// https://github.com/GoogleChrome/workbox/issues/2202
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navigator.serviceWorker.addEventListener('message', this._onMessage);
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}
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/**
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* Registers a service worker for this instances script URL and service
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* worker options. By default this method delays registration until after
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* the window has loaded.
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*
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* @param {Object} [options]
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* @param {Function} [options.immediate=false] Setting this to true will
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* register the service worker immediately, even if the window has
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* not loaded (not recommended).
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*/
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async register({ immediate = false } = {}) {
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if (process.env.NODE_ENV !== 'production') {
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if (this._registrationTime) {
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logger.error('Cannot re-register a Workbox instance after it has ' +
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'been registered. Create a new instance instead.');
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return;
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}
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}
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if (!immediate && document.readyState !== 'complete') {
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await new Promise((res) => window.addEventListener('load', res));
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}
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// Set this flag to true if any service worker was controlling the page
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// at registration time.
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this._isUpdate = Boolean(navigator.serviceWorker.controller);
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// Before registering, attempt to determine if a SW is already controlling
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// the page, and if that SW script (and version, if specified) matches this
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// instance's script.
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this._compatibleControllingSW = this._getControllingSWIfCompatible();
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this._registration = await this._registerScript();
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// If we have a compatible controller, store the controller as the "own"
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// SW, resolve active/controlling deferreds and add necessary listeners.
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if (this._compatibleControllingSW) {
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this._sw = this._compatibleControllingSW;
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this._activeDeferred.resolve(this._compatibleControllingSW);
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this._controllingDeferred.resolve(this._compatibleControllingSW);
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this._compatibleControllingSW.addEventListener('statechange', this._onStateChange, { once: true });
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}
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// If there's a waiting service worker with a matching URL before the
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// `updatefound` event fires, it likely means that this site is open
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// in another tab, or the user refreshed the page (and thus the previous
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// page wasn't fully unloaded before this page started loading).
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// https://developers.google.com/web/fundamentals/primers/service-workers/lifecycle#waiting
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const waitingSW = this._registration.waiting;
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if (waitingSW &&
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urlsMatch(waitingSW.scriptURL, this._scriptURL.toString())) {
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// Store the waiting SW as the "own" Sw, even if it means overwriting
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// a compatible controller.
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this._sw = waitingSW;
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// Run this in the next microtask, so any code that adds an event
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// listener after awaiting `register()` will get this event.
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dontWaitFor(Promise.resolve().then(() => {
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this.dispatchEvent(new WorkboxEvent('waiting', {
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sw: waitingSW,
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wasWaitingBeforeRegister: true,
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}));
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if (process.env.NODE_ENV !== 'production') {
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logger.warn('A service worker was already waiting to activate ' +
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'before this script was registered...');
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}
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}));
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}
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// If an "own" SW is already set, resolve the deferred.
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if (this._sw) {
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this._swDeferred.resolve(this._sw);
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this._ownSWs.add(this._sw);
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}
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if (process.env.NODE_ENV !== 'production') {
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logger.log('Successfully registered service worker.', this._scriptURL.toString());
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if (navigator.serviceWorker.controller) {
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if (this._compatibleControllingSW) {
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logger.debug('A service worker with the same script URL ' +
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'is already controlling this page.');
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}
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else {
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logger.debug('A service worker with a different script URL is ' +
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'currently controlling the page. The browser is now fetching ' +
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'the new script now...');
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}
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}
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const currentPageIsOutOfScope = () => {
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const scopeURL = new URL(this._registerOptions.scope || this._scriptURL.toString(), document.baseURI);
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const scopeURLBasePath = new URL('./', scopeURL.href).pathname;
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return !location.pathname.startsWith(scopeURLBasePath);
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};
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if (currentPageIsOutOfScope()) {
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logger.warn('The current page is not in scope for the registered ' +
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'service worker. Was this a mistake?');
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}
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}
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this._registration.addEventListener('updatefound', this._onUpdateFound);
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navigator.serviceWorker.addEventListener('controllerchange', this._onControllerChange);
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return this._registration;
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}
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/**
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* Checks for updates of the registered service worker.
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*/
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async update() {
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if (!this._registration) {
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if (process.env.NODE_ENV !== 'production') {
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logger.error('Cannot update a Workbox instance without ' +
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'being registered. Register the Workbox instance first.');
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}
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return;
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}
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// Try to update registration
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await this._registration.update();
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}
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/**
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* Resolves to the service worker registered by this instance as soon as it
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* is active. If a service worker was already controlling at registration
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* time then it will resolve to that if the script URLs (and optionally
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* script versions) match, otherwise it will wait until an update is found
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* and activates.
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*
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* @return {Promise<ServiceWorker>}
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*/
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get active() {
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return this._activeDeferred.promise;
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}
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/**
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* Resolves to the service worker registered by this instance as soon as it
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* is controlling the page. If a service worker was already controlling at
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* registration time then it will resolve to that if the script URLs (and
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* optionally script versions) match, otherwise it will wait until an update
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* is found and starts controlling the page.
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* Note: the first time a service worker is installed it will active but
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* not start controlling the page unless `clients.claim()` is called in the
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* service worker.
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*
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* @return {Promise<ServiceWorker>}
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*/
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get controlling() {
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return this._controllingDeferred.promise;
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}
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/**
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* Resolves with a reference to a service worker that matches the script URL
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* of this instance, as soon as it's available.
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*
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* If, at registration time, there's already an active or waiting service
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* worker with a matching script URL, it will be used (with the waiting
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* service worker taking precedence over the active service worker if both
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* match, since the waiting service worker would have been registered more
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* recently).
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* If there's no matching active or waiting service worker at registration
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* time then the promise will not resolve until an update is found and starts
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* installing, at which point the installing service worker is used.
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*
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* @return {Promise<ServiceWorker>}
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*/
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getSW() {
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// If `this._sw` is set, resolve with that as we want `getSW()` to
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// return the correct (new) service worker if an update is found.
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return this._sw !== undefined
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? Promise.resolve(this._sw)
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: this._swDeferred.promise;
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}
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/**
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* Sends the passed data object to the service worker registered by this
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* instance (via {@link workbox-window.Workbox#getSW}) and resolves
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* with a response (if any).
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*
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* A response can be set in a message handler in the service worker by
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* calling `event.ports[0].postMessage(...)`, which will resolve the promise
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* returned by `messageSW()`. If no response is set, the promise will never
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* resolve.
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*
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* @param {Object} data An object to send to the service worker
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* @return {Promise<Object>}
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*/
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// We might be able to change the 'data' type to Record<string, unknown> in the future.
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// eslint-disable-next-line @typescript-eslint/ban-types
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async messageSW(data) {
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const sw = await this.getSW();
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return messageSW(sw, data);
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}
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/**
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* Sends a `{type: 'SKIP_WAITING'}` message to the service worker that's
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* currently in the `waiting` state associated with the current registration.
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*
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* If there is no current registration or no service worker is `waiting`,
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* calling this will have no effect.
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*/
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messageSkipWaiting() {
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if (this._registration && this._registration.waiting) {
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void messageSW(this._registration.waiting, SKIP_WAITING_MESSAGE);
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}
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}
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/**
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* Checks for a service worker already controlling the page and returns
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* it if its script URL matches.
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*
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* @private
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* @return {ServiceWorker|undefined}
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*/
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_getControllingSWIfCompatible() {
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const controller = navigator.serviceWorker.controller;
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if (controller &&
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urlsMatch(controller.scriptURL, this._scriptURL.toString())) {
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return controller;
|
|
}
|
|
else {
|
|
return undefined;
|
|
}
|
|
}
|
|
/**
|
|
* Registers a service worker for this instances script URL and register
|
|
* options and tracks the time registration was complete.
|
|
*
|
|
* @private
|
|
*/
|
|
async _registerScript() {
|
|
try {
|
|
// this._scriptURL may be a TrustedScriptURL, but there's no support for
|
|
// passing that to register() in lib.dom right now.
|
|
// https://github.com/GoogleChrome/workbox/issues/2855
|
|
const reg = await navigator.serviceWorker.register(this._scriptURL, this._registerOptions);
|
|
// 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.
|
|
this._registrationTime = performance.now();
|
|
return reg;
|
|
}
|
|
catch (error) {
|
|
if (process.env.NODE_ENV !== 'production') {
|
|
logger.error(error);
|
|
}
|
|
// Re-throw the error.
|
|
throw error;
|
|
}
|
|
}
|
|
}
|
|
export { Workbox };
|
|
// The jsdoc comments below outline the events this instance may dispatch:
|
|
// -----------------------------------------------------------------------
|
|
/**
|
|
* The `message` event is dispatched any time a `postMessage` is received.
|
|
*
|
|
* @event workbox-window.Workbox#message
|
|
* @type {WorkboxEvent}
|
|
* @property {*} data The `data` property from the original `message` event.
|
|
* @property {Event} originalEvent The original [`message`]{@link https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent}
|
|
* event.
|
|
* @property {string} type `message`.
|
|
* @property {MessagePort[]} ports The `ports` value from `originalEvent`.
|
|
* @property {Workbox} target The `Workbox` instance.
|
|
*/
|
|
/**
|
|
* The `installed` event is dispatched if the state of a
|
|
* {@link workbox-window.Workbox} instance's
|
|
* {@link https://developers.google.com/web/tools/workbox/modules/workbox-precaching#def-registered-sw|registered service worker}
|
|
* changes to `installed`.
|
|
*
|
|
* Then can happen either the very first time a service worker is installed,
|
|
* or after an update to the current service worker is found. In the case
|
|
* of an update being found, the event's `isUpdate` property will be `true`.
|
|
*
|
|
* @event workbox-window.Workbox#installed
|
|
* @type {WorkboxEvent}
|
|
* @property {ServiceWorker} sw The service worker instance.
|
|
* @property {Event} originalEvent The original [`statechange`]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker/onstatechange}
|
|
* event.
|
|
* @property {boolean|undefined} isUpdate True if a service worker was already
|
|
* controlling when this `Workbox` instance called `register()`.
|
|
* @property {boolean|undefined} isExternal True if this event is associated
|
|
* with an [external service worker]{@link https://developers.google.com/web/tools/workbox/modules/workbox-window#when_an_unexpected_version_of_the_service_worker_is_found}.
|
|
* @property {string} type `installed`.
|
|
* @property {Workbox} target The `Workbox` instance.
|
|
*/
|
|
/**
|
|
* The `waiting` event is dispatched if the state of a
|
|
* {@link workbox-window.Workbox} instance's
|
|
* [registered service worker]{@link https://developers.google.com/web/tools/workbox/modules/workbox-precaching#def-registered-sw}
|
|
* changes to `installed` and then doesn't immediately change to `activating`.
|
|
* It may also be dispatched if a service worker with the same
|
|
* [`scriptURL`]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker/scriptURL}
|
|
* was already waiting when the {@link workbox-window.Workbox#register}
|
|
* method was called.
|
|
*
|
|
* @event workbox-window.Workbox#waiting
|
|
* @type {WorkboxEvent}
|
|
* @property {ServiceWorker} sw The service worker instance.
|
|
* @property {Event|undefined} originalEvent The original
|
|
* [`statechange`]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker/onstatechange}
|
|
* event, or `undefined` in the case where the service worker was waiting
|
|
* to before `.register()` was called.
|
|
* @property {boolean|undefined} isUpdate True if a service worker was already
|
|
* controlling when this `Workbox` instance called `register()`.
|
|
* @property {boolean|undefined} isExternal True if this event is associated
|
|
* with an [external service worker]{@link https://developers.google.com/web/tools/workbox/modules/workbox-window#when_an_unexpected_version_of_the_service_worker_is_found}.
|
|
* @property {boolean|undefined} wasWaitingBeforeRegister True if a service worker with
|
|
* a matching `scriptURL` was already waiting when this `Workbox`
|
|
* instance called `register()`.
|
|
* @property {string} type `waiting`.
|
|
* @property {Workbox} target The `Workbox` instance.
|
|
*/
|
|
/**
|
|
* The `controlling` event is dispatched if a
|
|
* [`controllerchange`]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/oncontrollerchange}
|
|
* fires on the service worker [container]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer}
|
|
* and the [`scriptURL`]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker/scriptURL}
|
|
* of the new [controller]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/controller}
|
|
* matches the `scriptURL` of the `Workbox` instance's
|
|
* [registered service worker]{@link https://developers.google.com/web/tools/workbox/modules/workbox-precaching#def-registered-sw}.
|
|
*
|
|
* @event workbox-window.Workbox#controlling
|
|
* @type {WorkboxEvent}
|
|
* @property {ServiceWorker} sw The service worker instance.
|
|
* @property {Event} originalEvent The original [`controllerchange`]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/oncontrollerchange}
|
|
* event.
|
|
* @property {boolean|undefined} isUpdate True if a service worker was already
|
|
* controlling when this service worker was registered.
|
|
* @property {boolean|undefined} isExternal True if this event is associated
|
|
* with an [external service worker]{@link https://developers.google.com/web/tools/workbox/modules/workbox-window#when_an_unexpected_version_of_the_service_worker_is_found}.
|
|
* @property {string} type `controlling`.
|
|
* @property {Workbox} target The `Workbox` instance.
|
|
*/
|
|
/**
|
|
* The `activated` event is dispatched if the state of a
|
|
* {@link workbox-window.Workbox} instance's
|
|
* {@link https://developers.google.com/web/tools/workbox/modules/workbox-precaching#def-registered-sw|registered service worker}
|
|
* changes to `activated`.
|
|
*
|
|
* @event workbox-window.Workbox#activated
|
|
* @type {WorkboxEvent}
|
|
* @property {ServiceWorker} sw The service worker instance.
|
|
* @property {Event} originalEvent The original [`statechange`]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker/onstatechange}
|
|
* event.
|
|
* @property {boolean|undefined} isUpdate True if a service worker was already
|
|
* controlling when this `Workbox` instance called `register()`.
|
|
* @property {boolean|undefined} isExternal True if this event is associated
|
|
* with an [external service worker]{@link https://developers.google.com/web/tools/workbox/modules/workbox-window#when_an_unexpected_version_of_the_service_worker_is_found}.
|
|
* @property {string} type `activated`.
|
|
* @property {Workbox} target The `Workbox` instance.
|
|
*/
|
|
/**
|
|
* The `redundant` event is dispatched if the state of a
|
|
* {@link workbox-window.Workbox} instance's
|
|
* [registered service worker]{@link https://developers.google.com/web/tools/workbox/modules/workbox-precaching#def-registered-sw}
|
|
* changes to `redundant`.
|
|
*
|
|
* @event workbox-window.Workbox#redundant
|
|
* @type {WorkboxEvent}
|
|
* @property {ServiceWorker} sw The service worker instance.
|
|
* @property {Event} originalEvent The original [`statechange`]{@link https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker/onstatechange}
|
|
* event.
|
|
* @property {boolean|undefined} isUpdate True if a service worker was already
|
|
* controlling when this `Workbox` instance called `register()`.
|
|
* @property {string} type `redundant`.
|
|
* @property {Workbox} target The `Workbox` instance.
|
|
*/
|