WIP - add extractor, generate snippet_data

node_modules/workbox-core/_private/DBWrapper.mjs

@@ -0,0 +1,325 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import '../_version.mjs';
+
+/**
+ * A class that wraps common IndexedDB functionality in a promise-based API.
+ * It exposes all the underlying power and functionality of IndexedDB, but
+ * wraps the most commonly used features in a way that's much simpler to use.
+ *
+ * @private
+ */
+class DBWrapper {
+  /**
+   * @param {string} name
+   * @param {number} version
+   * @param {Object=} [callback]
+   * @param {function(this:DBWrapper, Event)} [callbacks.onupgradeneeded]
+   * @param {function(this:DBWrapper, Event)} [callbacks.onversionchange]
+   *     Defaults to DBWrapper.prototype._onversionchange when not specified.
+   */
+  constructor(name, version, {
+    onupgradeneeded,
+    onversionchange = this._onversionchange,
+  } = {}) {
+    this._name = name;
+    this._version = version;
+    this._onupgradeneeded = onupgradeneeded;
+    this._onversionchange = onversionchange;
+
+    // If this is null, it means the database isn't open.
+    this._db = null;
+  }
+
+  /**
+   * Opens a connected to an IDBDatabase, invokes any onupgradedneeded
+   * callback, and added an onversionchange callback to the database.
+   *
+   * @return {IDBDatabase}
+   *
+   * @private
+   */
+  async open() {
+    if (this._db) return;
+
+    this._db = await new Promise((resolve, reject) => {
+      // This flag is flipped to true if the timeout callback runs prior
+      // to the request failing or succeeding. Note: we use a timeout instead
+      // of an onblocked handler since there are cases where onblocked will
+      // never never run. A timeout better handles all possible scenarios:
+      // https://github.com/w3c/IndexedDB/issues/223
+      let openRequestTimedOut = false;
+      setTimeout(() => {
+        openRequestTimedOut = true;
+        reject(new Error('The open request was blocked and timed out'));
+      }, this.OPEN_TIMEOUT);
+
+      const openRequest = indexedDB.open(this._name, this._version);
+      openRequest.onerror = (evt) => reject(openRequest.error);
+      openRequest.onupgradeneeded = (evt) => {
+        if (openRequestTimedOut) {
+          openRequest.transaction.abort();
+          evt.target.result.close();
+        } else if (this._onupgradeneeded) {
+          this._onupgradeneeded(evt);
+        }
+      };
+      openRequest.onsuccess = (evt) => {
+        const db = evt.target.result;
+        if (openRequestTimedOut) {
+          db.close();
+        } else {
+          db.onversionchange = this._onversionchange;
+          resolve(db);
+        }
+      };
+    });
+
+    return this;
+  }
+
+  /**
+   * Delegates to the native `get()` method for the object store.
+   *
+   * @param {string} storeName The name of the object store to put the value.
+   * @param {...*} args The values passed to the delegated method.
+   * @return {*} The key of the entry.
+   *
+   * @private
+   */
+  async get(storeName, ...args) {
+    return await this._call('get', storeName, 'readonly', ...args);
+  }
+
+  /**
+   * Delegates to the native `add()` method for the object store.
+   *
+   * @param {string} storeName The name of the object store to put the value.
+   * @param {...*} args The values passed to the delegated method.
+   * @return {*} The key of the entry.
+   *
+   * @private
+   */
+  async add(storeName, ...args) {
+    return await this._call('add', storeName, 'readwrite', ...args);
+  }
+
+  /**
+   * Delegates to the native `put()` method for the object store.
+   *
+   * @param {string} storeName The name of the object store to put the value.
+   * @param {...*} args The values passed to the delegated method.
+   * @return {*} The key of the entry.
+   *
+   * @private
+   */
+  async put(storeName, ...args) {
+    return await this._call('put', storeName, 'readwrite', ...args);
+  }
+
+  /**
+   * Delegates to the native `delete()` method for the object store.
+   *
+   * @param {string} storeName
+   * @param {...*} args The values passed to the delegated method.
+   *
+   * @private
+   */
+  async delete(storeName, ...args) {
+    await this._call('delete', storeName, 'readwrite', ...args);
+  }
+
+  /**
+   * Deletes the underlying database, ensuring that any open connections are
+   * closed first.
+   *
+   * @private
+   */
+  async deleteDatabase() {
+    this.close();
+    this._db = null;
+    await new Promise((resolve, reject) => {
+      const request = indexedDB.deleteDatabase(this._name);
+      request.onerror = (evt) => reject(evt.target.error);
+      request.onblocked = () => reject(new Error('Deletion was blocked.'));
+      request.onsuccess = () => resolve();
+    });
+  }
+
+  /**
+   * Delegates to the native `getAll()` or polyfills it via the `find()`
+   * method in older browsers.
+   *
+   * @param {string} storeName
+   * @param {*} query
+   * @param {number} count
+   * @return {Array}
+   *
+   * @private
+   */
+  async getAll(storeName, query, count) {
+    if ('getAll' in IDBObjectStore.prototype) {
+      return await this._call('getAll', storeName, 'readonly', query, count);
+    } else {
+      return await this.getAllMatching(storeName, {query, count});
+    }
+  }
+
+  /**
+   * Supports flexible lookup in an object store by specifying an index,
+   * query, direction, and count. This method returns an array of objects
+   * with the signature .
+   *
+   * @param {string} storeName
+   * @param {Object} [opts]
+   * @param {IDBCursorDirection} [opts.direction]
+   * @param {*} [opts.query]
+   * @param {string} [opts.index] The index to use (if specified).
+   * @param {number} [opts.count] The max number of results to return.
+   * @param {boolean} [opts.includeKeys] When true, the structure of the
+   *     returned objects is changed from an array of values to an array of
+   *     objects in the form {key, primaryKey, value}.
+   * @return {Array}
+   *
+   * @private
+   */
+  async getAllMatching(storeName, opts = {}) {
+    return await this.transaction([storeName], 'readonly', (stores, done) => {
+      const store = stores[storeName];
+      const target = opts.index ? store.index(opts.index) : store;
+      const results = [];
+
+      // Passing `undefined` arguments to Edge's `openCursor(...)` causes
+      // 'DOMException: DataError'
+      // Details in issue: https://github.com/GoogleChrome/workbox/issues/1509
+      const query = opts.query || null;
+      const direction = opts.direction || 'next';
+      target.openCursor(query, direction).onsuccess = (evt) => {
+        const cursor = evt.target.result;
+        if (cursor) {
+          const {primaryKey, key, value} = cursor;
+          results.push(opts.includeKeys ? {primaryKey, key, value} : value);
+          if (opts.count && results.length >= opts.count) {
+            done(results);
+          } else {
+            cursor.continue();
+          }
+        } else {
+          done(results);
+        }
+      };
+    });
+  }
+
+  /**
+   * Accepts a list of stores, a transaction type, and a callback and
+   * performs a transaction. A promise is returned that resolves to whatever
+   * value the callback chooses. The callback holds all the transaction logic
+   * and is invoked with three arguments:
+   *   1. An object mapping object store names to IDBObjectStore values.
+   *   2. A `done` function, that's used to resolve the promise when
+   *      when the transaction is done.
+   *   3. An `abort` function that can be called to abort the transaction
+   *      at any time.
+   *
+   * @param {Array<string>} storeNames An array of object store names
+   *     involved in the transaction.
+   * @param {string} type Can be `readonly` or `readwrite`.
+   * @param {function(Object, function(), function(*)):?IDBRequest} callback
+   * @return {*} The result of the transaction ran by the callback.
+   *
+   * @private
+   */
+  async transaction(storeNames, type, callback) {
+    await this.open();
+    const result = await new Promise((resolve, reject) => {
+      const txn = this._db.transaction(storeNames, type);
+      const done = (value) => resolve(value);
+      const abort = () => {
+        reject(new Error('The transaction was manually aborted'));
+        txn.abort();
+      };
+      txn.onerror = (evt) => reject(evt.target.error);
+      txn.onabort = (evt) => reject(evt.target.error);
+      txn.oncomplete = () => resolve();
+
+      const stores = {};
+      for (const storeName of storeNames) {
+        stores[storeName] = txn.objectStore(storeName);
+      }
+      callback(stores, done, abort);
+    });
+    return result;
+  }
+
+  /**
+   * Delegates async to a native IDBObjectStore method.
+   *
+   * @param {string} method The method name.
+   * @param {string} storeName The object store name.
+   * @param {string} type Can be `readonly` or `readwrite`.
+   * @param {...*} args The list of args to pass to the native method.
+   * @return {*} The result of the transaction.
+   *
+   * @private
+   */
+  async _call(method, storeName, type, ...args) {
+    await this.open();
+    const callback = (stores, done) => {
+      stores[storeName][method](...args).onsuccess = (evt) => {
+        done(evt.target.result);
+      };
+    };
+
+    return await this.transaction([storeName], type, callback);
+  }
+
+  /**
+   * The default onversionchange handler, which closes the database so other
+   * connections can open without being blocked.
+   *
+   * @param {Event} evt
+   *
+   * @private
+   */
+  _onversionchange(evt) {
+    this.close();
+  }
+
+  /**
+   * Closes the connection opened by `DBWrapper.open()`. Generally this method
+   * doesn't need to be called since:
+   *   1. It's usually better to keep a connection open since opening
+   *      a new connection is somewhat slow.
+   *   2. Connections are automatically closed when the reference is
+   *      garbage collected.
+   * The primary use case for needing to close a connection is when another
+   * reference (typically in another tab) needs to upgrade it and would be
+   * blocked by the current, open connection.
+   *
+   * @private
+   */
+  close() {
+    if (this._db) this._db.close();
+  }
+}
+
+// Exposed to let users modify the default timeout on a per-instance
+// or global basis.
+DBWrapper.prototype.OPEN_TIMEOUT = 2000;
+
+export {DBWrapper};

node_modules/workbox-core/_private/WorkboxError.mjs

@@ -0,0 +1,48 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import messageGenerator from '../models/messages/messageGenerator.mjs';
+import '../_version.mjs';
+
+/**
+ * Workbox errors should be thrown with this class.
+ * This allows use to ensure the type easily in tests,
+ * helps developers identify errors from workbox
+ * easily and allows use to optimise error
+ * messages correctly.
+ *
+ * @private
+ */
+class WorkboxError extends Error {
+  /**
+   *
+   * @param {string} errorCode The error code that
+   * identifies this particular error.
+   * @param {Object=} details Any relevant arguments
+   * that will help developers identify issues should
+   * be added as a key on the context object.
+   */
+  constructor(errorCode, details) {
+    let message = messageGenerator(errorCode, details);
+
+    super(message);
+
+    this.name = errorCode;
+    this.details = details;
+  }
+}
+
+export {WorkboxError};

node_modules/workbox-core/_private/assert.mjs

@@ -0,0 +1,109 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import {WorkboxError} from '../_private/WorkboxError.mjs';
+import '../_version.mjs';
+
+/*
+ * This method returns true if the current context is a service worker.
+ */
+const isSwEnv = (moduleName) => {
+  if (!('ServiceWorkerGlobalScope' in self)) {
+    throw new WorkboxError('not-in-sw', {moduleName});
+  }
+};
+
+/*
+ * This method throws if the supplied value is not an array.
+ * The destructed values are required to produce a meaningful error for users.
+ * The destructed and restructured object is so it's clear what is
+ * needed.
+ */
+const isArray = (value, {moduleName, className, funcName, paramName}) => {
+  if (!Array.isArray(value)) {
+    throw new WorkboxError('not-an-array', {
+      moduleName,
+      className,
+      funcName,
+      paramName,
+    });
+  }
+};
+
+const hasMethod = (object, expectedMethod,
+                   {moduleName, className, funcName, paramName}) => {
+  const type = typeof object[expectedMethod];
+  if (type !== 'function') {
+    throw new WorkboxError('missing-a-method', {paramName, expectedMethod,
+      moduleName, className, funcName});
+  }
+};
+
+const isType = (object, expectedType,
+                {moduleName, className, funcName, paramName}) => {
+  if (typeof object !== expectedType) {
+    throw new WorkboxError('incorrect-type', {paramName, expectedType,
+      moduleName, className, funcName});
+  }
+};
+
+const isInstance = (object, expectedClass,
+                    {moduleName, className, funcName,
+                      paramName, isReturnValueProblem}) => {
+  if (!(object instanceof expectedClass)) {
+    throw new WorkboxError('incorrect-class', {paramName, expectedClass,
+      moduleName, className, funcName, isReturnValueProblem});
+  }
+};
+
+const isOneOf = (value, validValues, {paramName}) => {
+  if (!validValues.includes(value)) {
+    throw new WorkboxError('invalid-value', {
+      paramName,
+      value,
+      validValueDescription: `Valid values are ${JSON.stringify(validValues)}.`,
+    });
+  }
+};
+
+const isArrayOfClass = (value, expectedClass,
+  {moduleName, className, funcName, paramName}) => {
+  const error = new WorkboxError('not-array-of-class', {
+    value, expectedClass,
+    moduleName, className, funcName, paramName,
+  });
+  if (!Array.isArray(value)) {
+    throw error;
+  }
+
+  for (let item of value) {
+    if (!(item instanceof expectedClass)) {
+      throw error;
+    }
+  }
+};
+
+const finalAssertExports = process.env.NODE_ENV === 'production' ? null : {
+  hasMethod,
+  isArray,
+  isInstance,
+  isOneOf,
+  isSwEnv,
+  isType,
+  isArrayOfClass,
+};
+
+export {finalAssertExports as assert};

node_modules/workbox-core/_private/cacheNames.mjs

@@ -0,0 +1,52 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import '../_version.mjs';
+
+const _cacheNameDetails = {
+  prefix: 'workbox',
+  suffix: self.registration.scope,
+  googleAnalytics: 'googleAnalytics',
+  precache: 'precache',
+  runtime: 'runtime',
+};
+
+const _createCacheName = (cacheName) => {
+  return [_cacheNameDetails.prefix, cacheName, _cacheNameDetails.suffix]
+    .filter((value) => value.length > 0)
+    .join('-');
+};
+
+const cacheNames = {
+  updateDetails: (details) => {
+    Object.keys(_cacheNameDetails).forEach((key) => {
+      if (typeof details[key] !== 'undefined') {
+        _cacheNameDetails[key] = details[key];
+      }
+    });
+  },
+  getGoogleAnalyticsName: (userCacheName) => {
+    return userCacheName || _createCacheName(_cacheNameDetails.googleAnalytics);
+  },
+  getPrecacheName: (userCacheName) => {
+    return userCacheName || _createCacheName(_cacheNameDetails.precache);
+  },
+  getRuntimeName: (userCacheName) => {
+    return userCacheName || _createCacheName(_cacheNameDetails.runtime);
+  },
+};
+
+export {cacheNames};

node_modules/workbox-core/_private/cacheWrapper.mjs

@@ -0,0 +1,236 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import pluginEvents from '../models/pluginEvents.mjs';
+import pluginUtils from '../utils/pluginUtils.mjs';
+import {WorkboxError} from './WorkboxError.mjs';
+import {assert} from './assert.mjs';
+import {executeQuotaErrorCallbacks} from './quota.mjs';
+import {getFriendlyURL} from './getFriendlyURL.mjs';
+import {logger} from './logger.mjs';
+
+import '../_version.mjs';
+
+/**
+ * Wrapper around cache.put().
+ *
+ * Will call `cacheDidUpdate` on plugins if the cache was updated.
+ *
+ * @param {Object} options
+ * @param {string} options.cacheName
+ * @param {Request} options.request
+ * @param {Response} options.response
+ * @param {Event} [options.event]
+ * @param {Array<Object>} [options.plugins=[]]
+ *
+ * @private
+ * @memberof module:workbox-core
+ */
+const putWrapper = async ({
+    cacheName,
+    request,
+    response,
+    event,
+    plugins = [],
+  } = {}) => {
+  if (!response) {
+    if (process.env.NODE_ENV !== 'production') {
+      logger.error(`Cannot cache non-existent response for ` +
+        `'${getFriendlyURL(request.url)}'.`);
+    }
+
+    throw new WorkboxError('cache-put-with-no-response', {
+      url: getFriendlyURL(request.url),
+    });
+  }
+
+  let responseToCache =
+      await _isResponseSafeToCache({request, response, event, plugins});
+
+  if (!responseToCache) {
+    if (process.env.NODE_ENV !== 'production') {
+      logger.debug(`Response '${getFriendlyURL(request.url)}' will not be ` +
+        `cached.`, responseToCache);
+    }
+    return;
+  }
+
+  if (process.env.NODE_ENV !== 'production') {
+    if (responseToCache.method && responseToCache.method !== 'GET') {
+      throw new WorkboxError('attempt-to-cache-non-get-request', {
+        url: getFriendlyURL(request.url),
+        method: responseToCache.method,
+      });
+    }
+  }
+
+  const cache = await caches.open(cacheName);
+
+  const updatePlugins = pluginUtils.filter(
+    plugins, pluginEvents.CACHE_DID_UPDATE);
+
+  let oldResponse = updatePlugins.length > 0 ?
+    await matchWrapper({cacheName, request}) : null;
+
+  if (process.env.NODE_ENV !== 'production') {
+    logger.debug(`Updating the '${cacheName}' cache with a new Response for ` +
+      `${getFriendlyURL(request.url)}.`);
+  }
+
+  try {
+    await cache.put(request, responseToCache);
+  } catch (error) {
+    // See https://developer.mozilla.org/en-US/docs/Web/API/DOMException#exception-QuotaExceededError
+    if (error.name === 'QuotaExceededError') {
+      await executeQuotaErrorCallbacks();
+    }
+    throw error;
+  }
+
+  for (let plugin of updatePlugins) {
+    await plugin[pluginEvents.CACHE_DID_UPDATE].call(plugin, {
+      cacheName,
+      request,
+      event,
+      oldResponse,
+      newResponse: responseToCache,
+    });
+  }
+};
+
+/**
+ * This is a wrapper around cache.match().
+ *
+ * @param {Object} options
+ * @param {string} options.cacheName Name of the cache to match against.
+ * @param {Request} options.request The Request that will be used to look up
+ *.    cache entries.
+ * @param {Event} [options.event] The event that propted the action.
+ * @param {Object} [options.matchOptions] Options passed to cache.match().
+ * @param {Array<Object>} [options.plugins=[]] Array of plugins.
+ * @return {Response} A cached response if available.
+ *
+ * @private
+ * @memberof module:workbox-core
+ */
+const matchWrapper = async ({
+    cacheName,
+    request,
+    event,
+    matchOptions,
+    plugins = []}) => {
+  const cache = await caches.open(cacheName);
+  let cachedResponse = await cache.match(request, matchOptions);
+  if (process.env.NODE_ENV !== 'production') {
+    if (cachedResponse) {
+      logger.debug(`Found a cached response in '${cacheName}'.`);
+    } else {
+      logger.debug(`No cached response found in '${cacheName}'.`);
+    }
+  }
+  for (let plugin of plugins) {
+    if (pluginEvents.CACHED_RESPONSE_WILL_BE_USED in plugin) {
+      cachedResponse = await plugin[pluginEvents.CACHED_RESPONSE_WILL_BE_USED]
+        .call(plugin, {
+          cacheName,
+          request,
+          event,
+          matchOptions,
+          cachedResponse,
+        });
+      if (process.env.NODE_ENV !== 'production') {
+        if (cachedResponse) {
+          assert.isInstance(cachedResponse, Response, {
+            moduleName: 'Plugin',
+            funcName: pluginEvents.CACHED_RESPONSE_WILL_BE_USED,
+            isReturnValueProblem: true,
+          });
+        }
+      }
+    }
+  }
+  return cachedResponse;
+};
+
+/**
+ * This method will call cacheWillUpdate on the available plugins (or use
+ * response.ok) to determine if the Response is safe and valid to cache.
+ *
+ * @param {Object} options
+ * @param {Request} options.request
+ * @param {Response} options.response
+ * @param {Event} [options.event]
+ * @param {Array<Object>} [options.plugins=[]]
+ * @return {Promise<Response>}
+ *
+ * @private
+ * @memberof module:workbox-core
+ */
+const _isResponseSafeToCache = async ({request, response, event, plugins}) => {
+  let responseToCache = response;
+  let pluginsUsed = false;
+  for (let plugin of plugins) {
+    if (pluginEvents.CACHE_WILL_UPDATE in plugin) {
+      pluginsUsed = true;
+      responseToCache = await plugin[pluginEvents.CACHE_WILL_UPDATE]
+        .call(plugin, {
+          request,
+          response: responseToCache,
+          event,
+        });
+
+      if (process.env.NODE_ENV !== 'production') {
+        if (responseToCache) {
+          assert.isInstance(responseToCache, Response, {
+            moduleName: 'Plugin',
+            funcName: pluginEvents.CACHE_WILL_UPDATE,
+            isReturnValueProblem: true,
+          });
+        }
+      }
+
+      if (!responseToCache) {
+        break;
+      }
+    }
+  }
+
+  if (!pluginsUsed) {
+    if (process.env.NODE_ENV !== 'production') {
+      if (!responseToCache.ok) {
+        if (responseToCache.status === 0) {
+          logger.warn(`The response for '${request.url}' is an opaque ` +
+            `response. The caching strategy that you're using will not ` +
+            `cache opaque responses by default.`);
+        } else {
+          logger.debug(`The response for '${request.url}' returned ` +
+          `a status code of '${response.status}' and won't be cached as a ` +
+          `result.`);
+        }
+      }
+    }
+    responseToCache = responseToCache.ok ? responseToCache : null;
+  }
+
+  return responseToCache ? responseToCache : null;
+};
+
+const cacheWrapper = {
+  put: putWrapper,
+  match: matchWrapper,
+};
+
+export {cacheWrapper};

node_modules/workbox-core/_private/checkSWFileCacheHeaders.mjs

@@ -0,0 +1,88 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import {logger} from './logger.mjs';
+import '../_version.mjs';
+
+/**
+ * Logs a warning to the user recommending changing
+ * to max-age=0 or no-cache.
+ *
+ * @param {string} cacheControlHeader
+ *
+ * @private
+ */
+function showWarning(cacheControlHeader) {
+  const docsUrl = 'https://developers.google.com/web/tools/workbox/guides/service-worker-checklist#cache-control_of_your_service_worker_file';
+  logger.warn(`You are setting a 'cache-control' header of ` +
+    `'${cacheControlHeader}' on your service worker file. This should be ` +
+    `set to 'max-age=0' or 'no-cache' to ensure the latest service worker ` +
+    `is served to your users. Learn more here: ${docsUrl}`
+  );
+}
+
+/**
+ * Checks for cache-control header on SW file and
+ * warns the developer if it exists with a value
+ * other than max-age=0 or no-cache.
+ *
+ * @return {Promise}
+ * @private
+ */
+function checkSWFileCacheHeaders() {
+  // This is wrapped as an iife to allow async/await while making
+  //  rollup exclude it in builds.
+  return (async () => {
+    try {
+      const swFile = self.location.href;
+      const response = await fetch(swFile);
+      if (!response.ok) {
+        // Response failed so nothing we can check;
+        return;
+      }
+
+      if (!response.headers.has('cache-control')) {
+        // No cache control header.
+        return;
+      }
+
+      const cacheControlHeader = response.headers.get('cache-control');
+      const maxAgeResult = /max-age\s*=\s*(\d*)/g.exec(cacheControlHeader);
+      if (maxAgeResult) {
+        if (parseInt(maxAgeResult[1], 10) === 0) {
+          return;
+        }
+      }
+
+      if (cacheControlHeader.indexOf('no-cache') !== -1) {
+        return;
+      }
+
+      if (cacheControlHeader.indexOf('no-store') !== -1) {
+        return;
+      }
+
+      showWarning(cacheControlHeader);
+    } catch (err) {
+      // NOOP
+    }
+  })();
+}
+
+const finalCheckSWFileCacheHeaders =
+  process.env.NODE_ENV === 'production' ? null : checkSWFileCacheHeaders;
+
+export {finalCheckSWFileCacheHeaders as checkSWFileCacheHeaders};

node_modules/workbox-core/_private/fetchWrapper.mjs

@@ -0,0 +1,143 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import {WorkboxError} from './WorkboxError.mjs';
+import {logger} from './logger.mjs';
+import {assert} from './assert.mjs';
+import {getFriendlyURL} from '../_private/getFriendlyURL.mjs';
+import pluginEvents from '../models/pluginEvents.mjs';
+import pluginUtils from '../utils/pluginUtils.mjs';
+import '../_version.mjs';
+
+/**
+ * Wrapper around the fetch API.
+ *
+ * Will call requestWillFetch on available plugins.
+ *
+ * @param {Object} options
+ * @param {Request|string} options.request
+ * @param {Object} [options.fetchOptions]
+ * @param {Event} [options.event]
+ * @param {Array<Object>} [options.plugins=[]]
+ * @return {Promise<Response>}
+ *
+ * @private
+ * @memberof module:workbox-core
+ */
+const wrappedFetch = async ({
+    request,
+    fetchOptions,
+    event,
+    plugins = []}) => {
+  // We *should* be able to call `await event.preloadResponse` even if it's
+  // undefined, but for some reason, doing so leads to errors in our Node unit
+  // tests. To work around that, explicitly check preloadResponse's value first.
+  if (event && event.preloadResponse) {
+    const possiblePreloadResponse = await event.preloadResponse;
+    if (possiblePreloadResponse) {
+      if (process.env.NODE_ENV !== 'production') {
+        logger.log(`Using a preloaded navigation response for ` +
+          `'${getFriendlyURL(request.url)}'`);
+      }
+      return possiblePreloadResponse;
+    }
+  }
+
+  if (typeof request === 'string') {
+    request = new Request(request);
+  }
+
+  if (process.env.NODE_ENV !== 'production') {
+    assert.isInstance(request, Request, {
+      paramName: request,
+      expectedClass: 'Request',
+      moduleName: 'workbox-core',
+      className: 'fetchWrapper',
+      funcName: 'wrappedFetch',
+    });
+  }
+
+  const failedFetchPlugins = pluginUtils.filter(
+    plugins, pluginEvents.FETCH_DID_FAIL);
+
+  // If there is a fetchDidFail plugin, we need to save a clone of the
+  // original request before it's either modified by a requestWillFetch
+  // plugin or before the original request's body is consumed via fetch().
+  const originalRequest = failedFetchPlugins.length > 0 ?
+    request.clone() : null;
+
+  try {
+    for (let plugin of plugins) {
+      if (pluginEvents.REQUEST_WILL_FETCH in plugin) {
+        request = await plugin[pluginEvents.REQUEST_WILL_FETCH].call(plugin, {
+          request: request.clone(),
+          event,
+        });
+
+        if (process.env.NODE_ENV !== 'production') {
+          if (request) {
+            assert.isInstance(request, Request, {
+              moduleName: 'Plugin',
+              funcName: pluginEvents.CACHED_RESPONSE_WILL_BE_USED,
+              isReturnValueProblem: true,
+            });
+          }
+        }
+      }
+    }
+  } catch (err) {
+    throw new WorkboxError('plugin-error-request-will-fetch', {
+      thrownError: err,
+    });
+  }
+
+  // The request can be altered by plugins with `requestWillFetch` making
+  // the original request (Most likely from a `fetch` event) to be different
+  // to the Request we make. Pass both to `fetchDidFail` to aid debugging.
+  const pluginFilteredRequest = request.clone();
+
+  try {
+    const fetchResponse = await fetch(request, fetchOptions);
+    if (process.env.NODE_ENV !== 'production') {
+      logger.debug(`Network request for `+
+      `'${getFriendlyURL(request.url)}' returned a response with ` +
+      `status '${fetchResponse.status}'.`);
+    }
+    return fetchResponse;
+  } catch (error) {
+    if (process.env.NODE_ENV !== 'production') {
+      logger.error(`Network request for `+
+      `'${getFriendlyURL(request.url)}' threw an error.`, error);
+    }
+
+    for (let plugin of failedFetchPlugins) {
+      await plugin[pluginEvents.FETCH_DID_FAIL].call(plugin, {
+        error,
+        event,
+        originalRequest: originalRequest.clone(),
+        request: pluginFilteredRequest.clone(),
+      });
+    }
+
+    throw error;
+  }
+};
+
+const fetchWrapper = {
+  fetch: wrappedFetch,
+};
+
+export {fetchWrapper};

node_modules/workbox-core/_private/getFriendlyURL.mjs

@@ -0,0 +1,27 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import '../_version.mjs';
+
+const getFriendlyURL = (url) => {
+  const urlObj = new URL(url, location);
+  if (urlObj.origin === location.origin) {
+    return urlObj.pathname;
+  }
+  return urlObj.href;
+};
+
+export {getFriendlyURL};

node_modules/workbox-core/_private/logger.mjs

@@ -0,0 +1,95 @@
+/*
+  Copyright 2017 Google Inc.
+
+  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
+
+      https://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.
+*/
+
+import LOG_LEVELS from '../models/LogLevels.mjs';
+import '../_version.mjs';
+
+// Safari doesn't print all console.groupCollapsed() arguments.
+// Related bug: https://bugs.webkit.org/show_bug.cgi?id=182754
+const isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
+
+const GREY = `#7f8c8d`;
+const GREEN = `#2ecc71`;
+const YELLOW = `#f39c12`;
+const RED = `#c0392b`;
+const BLUE = `#3498db`;
+
+const getDefaultLogLevel = () => (process.env.NODE_ENV === 'production') ?
+  LOG_LEVELS.warn : LOG_LEVELS.log;
+
+let logLevel = getDefaultLogLevel();
+const shouldPrint = (minLevel) => (logLevel <= minLevel);
+const setLoggerLevel = (newLogLevel) => logLevel = newLogLevel;
+const getLoggerLevel = () => logLevel;
+
+// We always want groups to be logged unless logLevel is silent.
+const groupLevel = LOG_LEVELS.error;
+
+const _print = function(keyName, logArgs, levelColor) {
+  const logLevel = keyName.indexOf('group') === 0 ?
+    groupLevel : LOG_LEVELS[keyName];
+  if (!shouldPrint(logLevel)) {
+    return;
+  }
+
+  if (!levelColor || (keyName === 'groupCollapsed' && isSafari)) {
+    console[keyName](...logArgs);
+    return;
+  }
+
+  const logPrefix = [
+    '%cworkbox',
+    `background: ${levelColor}; color: white; padding: 2px 0.5em; ` +
+      `border-radius: 0.5em;`,
+  ];
+  console[keyName](...logPrefix, ...logArgs);
+};
+
+const groupEnd = () => {
+  if (shouldPrint(groupLevel)) {
+    console.groupEnd();
+  }
+};
+
+const defaultExport = {
+  groupEnd,
+  unprefixed: {
+    groupEnd,
+  },
+};
+
+const setupLogs = (keyName, color) => {
+  defaultExport[keyName] =
+    (...args) => _print(keyName, args, color);
+  defaultExport.unprefixed[keyName] =
+    (...args) => _print(keyName, args);
+};
+
+const levelToColor = {
+  debug: GREY,
+  log: GREEN,
+  warn: YELLOW,
+  error: RED,
+  groupCollapsed: BLUE,
+};
+Object.keys(levelToColor).forEach(
+  (keyName) => setupLogs(keyName, levelToColor[keyName])
+);
+
+export {getDefaultLogLevel};
+export {setLoggerLevel};
+export {getLoggerLevel};
+export {defaultExport as logger};

node_modules/workbox-core/_private/quota.mjs

@@ -0,0 +1,73 @@
+/*
+ Copyright 2018 Google Inc. All Rights Reserved.
+ 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.
+*/
+
+import {logger} from './logger.mjs';
+import {assert} from './assert.mjs';
+
+import '../_version.mjs';
+
+const callbacks = new Set();
+
+/**
+ * Adds a function to the set of callbacks that will be executed when there's
+ * a quota error.
+ *
+ * @param {Function} callback
+ * @memberof workbox.core
+ */
+function registerQuotaErrorCallback(callback) {
+  if (process.env.NODE_ENV !== 'production') {
+    assert.isType(callback, 'function', {
+      moduleName: 'workbox-core',
+      funcName: 'register',
+      paramName: 'callback',
+    });
+  }
+
+  callbacks.add(callback);
+
+  if (process.env.NODE_ENV !== 'production') {
+    logger.log('Registered a callback to respond to quota errors.', callback);
+  }
+}
+
+/**
+ * Runs all of the callback functions, one at a time sequentially, in the order
+ * in which they were registered.
+ *
+ * @memberof workbox.core
+ * @private
+ */
+async function executeQuotaErrorCallbacks() {
+  if (process.env.NODE_ENV !== 'production') {
+    logger.log(`About to run ${callbacks.size} callbacks to clean up caches.`);
+  }
+
+  for (const callback of callbacks) {
+    await callback();
+    if (process.env.NODE_ENV !== 'production') {
+      logger.log(callback, 'is complete.');
+    }
+  }
+
+  if (process.env.NODE_ENV !== 'production') {
+    logger.log('Finished running callbacks.');
+  }
+}
+
+export {
+  executeQuotaErrorCallbacks,
+  registerQuotaErrorCallback,
+};