Index: frontend/node_modules/workbox-range-requests/LICENSE
===================================================================
--- frontend/node_modules/workbox-range-requests/LICENSE	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/LICENSE	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,19 @@
+Copyright 2018 Google LLC
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
Index: frontend/node_modules/workbox-range-requests/README.md
===================================================================
--- frontend/node_modules/workbox-range-requests/README.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/README.md	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+This module's documentation can be found at https://developers.google.com/web/tools/workbox/modules/workbox-range-requests
Index: frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.d.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,26 @@
+import { WorkboxPlugin } from 'workbox-core/types.js';
+import './_version.js';
+/**
+ * The range request plugin makes it easy for a request with a 'Range' header to
+ * be fulfilled by a cached response.
+ *
+ * It does this by intercepting the `cachedResponseWillBeUsed` plugin callback
+ * and returning the appropriate subset of the cached response body.
+ *
+ * @memberof workbox-range-requests
+ */
+declare class RangeRequestsPlugin implements WorkboxPlugin {
+    /**
+     * @param {Object} options
+     * @param {Request} options.request The original request, which may or may not
+     * contain a Range: header.
+     * @param {Response} options.cachedResponse The complete cached response.
+     * @return {Promise<Response>} If request contains a 'Range' header, then a
+     * new response with status 206 whose body is a subset of `cachedResponse` is
+     * returned. Otherwise, `cachedResponse` is returned as-is.
+     *
+     * @private
+     */
+    cachedResponseWillBeUsed: WorkboxPlugin['cachedResponseWillBeUsed'];
+}
+export { RangeRequestsPlugin };
Index: frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.js
===================================================================
--- frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,44 @@
+/*
+  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.
+*/
+import { createPartialResponse } from './createPartialResponse.js';
+import './_version.js';
+/**
+ * The range request plugin makes it easy for a request with a 'Range' header to
+ * be fulfilled by a cached response.
+ *
+ * It does this by intercepting the `cachedResponseWillBeUsed` plugin callback
+ * and returning the appropriate subset of the cached response body.
+ *
+ * @memberof workbox-range-requests
+ */
+class RangeRequestsPlugin {
+    constructor() {
+        /**
+         * @param {Object} options
+         * @param {Request} options.request The original request, which may or may not
+         * contain a Range: header.
+         * @param {Response} options.cachedResponse The complete cached response.
+         * @return {Promise<Response>} If request contains a 'Range' header, then a
+         * new response with status 206 whose body is a subset of `cachedResponse` is
+         * returned. Otherwise, `cachedResponse` is returned as-is.
+         *
+         * @private
+         */
+        this.cachedResponseWillBeUsed = async ({ request, cachedResponse, }) => {
+            // Only return a sliced response if there's something valid in the cache,
+            // and there's a Range: header in the request.
+            if (cachedResponse && request.headers.has('range')) {
+                return await createPartialResponse(request, cachedResponse);
+            }
+            // If there was no Range: header, or if cachedResponse wasn't valid, just
+            // pass it through as-is.
+            return cachedResponse;
+        };
+    }
+}
+export { RangeRequestsPlugin };
Index: frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.mjs
===================================================================
--- frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/RangeRequestsPlugin.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+export * from './RangeRequestsPlugin.js';
Index: frontend/node_modules/workbox-range-requests/_version.js
===================================================================
--- frontend/node_modules/workbox-range-requests/_version.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/_version.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,6 @@
+"use strict";
+// @ts-ignore
+try {
+    self['workbox:range-requests:6.5.4'] && _();
+}
+catch (e) { }
Index: frontend/node_modules/workbox-range-requests/_version.mjs
===================================================================
--- frontend/node_modules/workbox-range-requests/_version.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/_version.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+try{self['workbox:range-requests:6.6.0']&&_()}catch(e){}// eslint-disable-line
Index: frontend/node_modules/workbox-range-requests/createPartialResponse.d.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/createPartialResponse.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/createPartialResponse.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,21 @@
+import './_version.js';
+/**
+ * Given a `Request` and `Response` objects as input, this will return a
+ * promise for a new `Response`.
+ *
+ * If the original `Response` already contains partial content (i.e. it has
+ * a status of 206), then this assumes it already fulfills the `Range:`
+ * requirements, and will return it as-is.
+ *
+ * @param {Request} request A request, which should contain a Range:
+ * header.
+ * @param {Response} originalResponse A response.
+ * @return {Promise<Response>} Either a `206 Partial Content` response, with
+ * the response body set to the slice of content specified by the request's
+ * `Range:` header, or a `416 Range Not Satisfiable` response if the
+ * conditions of the `Range:` header can't be met.
+ *
+ * @memberof workbox-range-requests
+ */
+declare function createPartialResponse(request: Request, originalResponse: Response): Promise<Response>;
+export { createPartialResponse };
Index: frontend/node_modules/workbox-range-requests/createPartialResponse.js
===================================================================
--- frontend/node_modules/workbox-range-requests/createPartialResponse.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/createPartialResponse.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,88 @@
+/*
+  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.
+*/
+import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
+import { assert } from 'workbox-core/_private/assert.js';
+import { logger } from 'workbox-core/_private/logger.js';
+import { calculateEffectiveBoundaries } from './utils/calculateEffectiveBoundaries.js';
+import { parseRangeHeader } from './utils/parseRangeHeader.js';
+import './_version.js';
+/**
+ * Given a `Request` and `Response` objects as input, this will return a
+ * promise for a new `Response`.
+ *
+ * If the original `Response` already contains partial content (i.e. it has
+ * a status of 206), then this assumes it already fulfills the `Range:`
+ * requirements, and will return it as-is.
+ *
+ * @param {Request} request A request, which should contain a Range:
+ * header.
+ * @param {Response} originalResponse A response.
+ * @return {Promise<Response>} Either a `206 Partial Content` response, with
+ * the response body set to the slice of content specified by the request's
+ * `Range:` header, or a `416 Range Not Satisfiable` response if the
+ * conditions of the `Range:` header can't be met.
+ *
+ * @memberof workbox-range-requests
+ */
+async function createPartialResponse(request, originalResponse) {
+    try {
+        if (process.env.NODE_ENV !== 'production') {
+            assert.isInstance(request, Request, {
+                moduleName: 'workbox-range-requests',
+                funcName: 'createPartialResponse',
+                paramName: 'request',
+            });
+            assert.isInstance(originalResponse, Response, {
+                moduleName: 'workbox-range-requests',
+                funcName: 'createPartialResponse',
+                paramName: 'originalResponse',
+            });
+        }
+        if (originalResponse.status === 206) {
+            // If we already have a 206, then just pass it through as-is;
+            // see https://github.com/GoogleChrome/workbox/issues/1720
+            return originalResponse;
+        }
+        const rangeHeader = request.headers.get('range');
+        if (!rangeHeader) {
+            throw new WorkboxError('no-range-header');
+        }
+        const boundaries = parseRangeHeader(rangeHeader);
+        const originalBlob = await originalResponse.blob();
+        const effectiveBoundaries = calculateEffectiveBoundaries(originalBlob, boundaries.start, boundaries.end);
+        const slicedBlob = originalBlob.slice(effectiveBoundaries.start, effectiveBoundaries.end);
+        const slicedBlobSize = slicedBlob.size;
+        const slicedResponse = new Response(slicedBlob, {
+            // Status code 206 is for a Partial Content response.
+            // See https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/206
+            status: 206,
+            statusText: 'Partial Content',
+            headers: originalResponse.headers,
+        });
+        slicedResponse.headers.set('Content-Length', String(slicedBlobSize));
+        slicedResponse.headers.set('Content-Range', `bytes ${effectiveBoundaries.start}-${effectiveBoundaries.end - 1}/` +
+            `${originalBlob.size}`);
+        return slicedResponse;
+    }
+    catch (error) {
+        if (process.env.NODE_ENV !== 'production') {
+            logger.warn(`Unable to construct a partial response; returning a ` +
+                `416 Range Not Satisfiable response instead.`);
+            logger.groupCollapsed(`View details here.`);
+            logger.log(error);
+            logger.log(request);
+            logger.log(originalResponse);
+            logger.groupEnd();
+        }
+        return new Response('', {
+            status: 416,
+            statusText: 'Range Not Satisfiable',
+        });
+    }
+}
+export { createPartialResponse };
Index: frontend/node_modules/workbox-range-requests/createPartialResponse.mjs
===================================================================
--- frontend/node_modules/workbox-range-requests/createPartialResponse.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/createPartialResponse.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+export * from './createPartialResponse.js';
Index: frontend/node_modules/workbox-range-requests/index.d.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,7 @@
+import { createPartialResponse } from './createPartialResponse.js';
+import { RangeRequestsPlugin } from './RangeRequestsPlugin.js';
+import './_version.js';
+/**
+ * @module workbox-range-requests
+ */
+export { createPartialResponse, RangeRequestsPlugin };
Index: frontend/node_modules/workbox-range-requests/index.js
===================================================================
--- frontend/node_modules/workbox-range-requests/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,14 @@
+/*
+  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.
+*/
+import { createPartialResponse } from './createPartialResponse.js';
+import { RangeRequestsPlugin } from './RangeRequestsPlugin.js';
+import './_version.js';
+/**
+ * @module workbox-range-requests
+ */
+export { createPartialResponse, RangeRequestsPlugin };
Index: frontend/node_modules/workbox-range-requests/index.mjs
===================================================================
--- frontend/node_modules/workbox-range-requests/index.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/index.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+export * from './index.js';
Index: frontend/node_modules/workbox-range-requests/package.json
===================================================================
--- frontend/node_modules/workbox-range-requests/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/package.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,32 @@
+{
+  "name": "workbox-range-requests",
+  "version": "6.6.0",
+  "license": "MIT",
+  "author": "Google's Web DevRel Team",
+  "description": "This library creates a new Response, given a source Response and a Range header value.",
+  "repository": "googlechrome/workbox",
+  "bugs": "https://github.com/googlechrome/workbox/issues",
+  "homepage": "https://github.com/GoogleChrome/workbox",
+  "keywords": [
+    "workbox",
+    "workboxjs",
+    "service worker",
+    "sw",
+    "caching",
+    "cache",
+    "range",
+    "media",
+    "workbox-plugin"
+  ],
+  "workbox": {
+    "browserNamespace": "workbox.rangeRequests",
+    "packageType": "sw"
+  },
+  "main": "index.js",
+  "module": "index.mjs",
+  "types": "index.d.ts",
+  "dependencies": {
+    "workbox-core": "6.6.0"
+  },
+  "gitHead": "252644491d9bb5a67518935ede6df530107c9475"
+}
Index: frontend/node_modules/workbox-range-requests/src/RangeRequestsPlugin.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/src/RangeRequestsPlugin.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/src/RangeRequestsPlugin.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,50 @@
+/*
+  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.
+*/
+
+import {WorkboxPlugin} from 'workbox-core/types.js';
+import {createPartialResponse} from './createPartialResponse.js';
+import './_version.js';
+
+/**
+ * The range request plugin makes it easy for a request with a 'Range' header to
+ * be fulfilled by a cached response.
+ *
+ * It does this by intercepting the `cachedResponseWillBeUsed` plugin callback
+ * and returning the appropriate subset of the cached response body.
+ *
+ * @memberof workbox-range-requests
+ */
+class RangeRequestsPlugin implements WorkboxPlugin {
+  /**
+   * @param {Object} options
+   * @param {Request} options.request The original request, which may or may not
+   * contain a Range: header.
+   * @param {Response} options.cachedResponse The complete cached response.
+   * @return {Promise<Response>} If request contains a 'Range' header, then a
+   * new response with status 206 whose body is a subset of `cachedResponse` is
+   * returned. Otherwise, `cachedResponse` is returned as-is.
+   *
+   * @private
+   */
+  cachedResponseWillBeUsed: WorkboxPlugin['cachedResponseWillBeUsed'] = async ({
+    request,
+    cachedResponse,
+  }) => {
+    // Only return a sliced response if there's something valid in the cache,
+    // and there's a Range: header in the request.
+    if (cachedResponse && request.headers.has('range')) {
+      return await createPartialResponse(request, cachedResponse);
+    }
+
+    // If there was no Range: header, or if cachedResponse wasn't valid, just
+    // pass it through as-is.
+    return cachedResponse;
+  };
+}
+
+export {RangeRequestsPlugin};
Index: frontend/node_modules/workbox-range-requests/src/_version.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/src/_version.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/src/_version.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,2 @@
+// @ts-ignore
+try{self['workbox:range-requests:6.6.0']&&_()}catch(e){}
Index: frontend/node_modules/workbox-range-requests/src/createPartialResponse.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/src/createPartialResponse.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/src/createPartialResponse.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,115 @@
+/*
+  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.
+*/
+
+import {WorkboxError} from 'workbox-core/_private/WorkboxError.js';
+import {assert} from 'workbox-core/_private/assert.js';
+import {logger} from 'workbox-core/_private/logger.js';
+import {calculateEffectiveBoundaries} from './utils/calculateEffectiveBoundaries.js';
+import {parseRangeHeader} from './utils/parseRangeHeader.js';
+import './_version.js';
+
+/**
+ * Given a `Request` and `Response` objects as input, this will return a
+ * promise for a new `Response`.
+ *
+ * If the original `Response` already contains partial content (i.e. it has
+ * a status of 206), then this assumes it already fulfills the `Range:`
+ * requirements, and will return it as-is.
+ *
+ * @param {Request} request A request, which should contain a Range:
+ * header.
+ * @param {Response} originalResponse A response.
+ * @return {Promise<Response>} Either a `206 Partial Content` response, with
+ * the response body set to the slice of content specified by the request's
+ * `Range:` header, or a `416 Range Not Satisfiable` response if the
+ * conditions of the `Range:` header can't be met.
+ *
+ * @memberof workbox-range-requests
+ */
+async function createPartialResponse(
+  request: Request,
+  originalResponse: Response,
+): Promise<Response> {
+  try {
+    if (process.env.NODE_ENV !== 'production') {
+      assert!.isInstance(request, Request, {
+        moduleName: 'workbox-range-requests',
+        funcName: 'createPartialResponse',
+        paramName: 'request',
+      });
+
+      assert!.isInstance(originalResponse, Response, {
+        moduleName: 'workbox-range-requests',
+        funcName: 'createPartialResponse',
+        paramName: 'originalResponse',
+      });
+    }
+
+    if (originalResponse.status === 206) {
+      // If we already have a 206, then just pass it through as-is;
+      // see https://github.com/GoogleChrome/workbox/issues/1720
+      return originalResponse;
+    }
+
+    const rangeHeader = request.headers.get('range');
+    if (!rangeHeader) {
+      throw new WorkboxError('no-range-header');
+    }
+
+    const boundaries = parseRangeHeader(rangeHeader);
+    const originalBlob = await originalResponse.blob();
+
+    const effectiveBoundaries = calculateEffectiveBoundaries(
+      originalBlob,
+      boundaries.start,
+      boundaries.end,
+    );
+
+    const slicedBlob = originalBlob.slice(
+      effectiveBoundaries.start,
+      effectiveBoundaries.end,
+    );
+    const slicedBlobSize = slicedBlob.size;
+
+    const slicedResponse = new Response(slicedBlob, {
+      // Status code 206 is for a Partial Content response.
+      // See https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/206
+      status: 206,
+      statusText: 'Partial Content',
+      headers: originalResponse.headers,
+    });
+
+    slicedResponse.headers.set('Content-Length', String(slicedBlobSize));
+    slicedResponse.headers.set(
+      'Content-Range',
+      `bytes ${effectiveBoundaries.start}-${effectiveBoundaries.end - 1}/` +
+        `${originalBlob.size}`,
+    );
+
+    return slicedResponse;
+  } catch (error) {
+    if (process.env.NODE_ENV !== 'production') {
+      logger.warn(
+        `Unable to construct a partial response; returning a ` +
+          `416 Range Not Satisfiable response instead.`,
+      );
+      logger.groupCollapsed(`View details here.`);
+      logger.log(error);
+      logger.log(request);
+      logger.log(originalResponse);
+      logger.groupEnd();
+    }
+
+    return new Response('', {
+      status: 416,
+      statusText: 'Range Not Satisfiable',
+    });
+  }
+}
+
+export {createPartialResponse};
Index: frontend/node_modules/workbox-range-requests/src/index.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/src/index.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/src/index.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,17 @@
+/*
+  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.
+*/
+
+import {createPartialResponse} from './createPartialResponse.js';
+import {RangeRequestsPlugin} from './RangeRequestsPlugin.js';
+import './_version.js';
+
+/**
+ * @module workbox-range-requests
+ */
+
+export {createPartialResponse, RangeRequestsPlugin};
Index: frontend/node_modules/workbox-range-requests/src/utils/calculateEffectiveBoundaries.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/src/utils/calculateEffectiveBoundaries.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/src/utils/calculateEffectiveBoundaries.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,67 @@
+/*
+  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.
+*/
+
+import {WorkboxError} from 'workbox-core/_private/WorkboxError.js';
+import {assert} from 'workbox-core/_private/assert.js';
+import '../_version.js';
+
+/**
+ * @param {Blob} blob A source blob.
+ * @param {number} [start] The offset to use as the start of the
+ * slice.
+ * @param {number} [end] The offset to use as the end of the slice.
+ * @return {Object} An object with `start` and `end` properties, reflecting
+ * the effective boundaries to use given the size of the blob.
+ *
+ * @private
+ */
+function calculateEffectiveBoundaries(
+  blob: Blob,
+  start?: number,
+  end?: number,
+): {start: number; end: number} {
+  if (process.env.NODE_ENV !== 'production') {
+    assert!.isInstance(blob, Blob, {
+      moduleName: 'workbox-range-requests',
+      funcName: 'calculateEffectiveBoundaries',
+      paramName: 'blob',
+    });
+  }
+
+  const blobSize = blob.size;
+
+  if ((end && end > blobSize) || (start && start < 0)) {
+    throw new WorkboxError('range-not-satisfiable', {
+      size: blobSize,
+      end,
+      start,
+    });
+  }
+
+  let effectiveStart: number;
+  let effectiveEnd: number;
+
+  if (start !== undefined && end !== undefined) {
+    effectiveStart = start;
+    // Range values are inclusive, so add 1 to the value.
+    effectiveEnd = end + 1;
+  } else if (start !== undefined && end === undefined) {
+    effectiveStart = start;
+    effectiveEnd = blobSize;
+  } else if (end !== undefined && start === undefined) {
+    effectiveStart = blobSize - end;
+    effectiveEnd = blobSize;
+  }
+
+  return {
+    start: effectiveStart!,
+    end: effectiveEnd!,
+  };
+}
+
+export {calculateEffectiveBoundaries};
Index: frontend/node_modules/workbox-range-requests/src/utils/parseRangeHeader.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/src/utils/parseRangeHeader.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/src/utils/parseRangeHeader.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,54 @@
+/*
+  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.
+*/
+
+import {WorkboxError} from 'workbox-core/_private/WorkboxError.js';
+import {assert} from 'workbox-core/_private/assert.js';
+import '../_version.js';
+
+/**
+ * @param {string} rangeHeader A Range: header value.
+ * @return {Object} An object with `start` and `end` properties, reflecting
+ * the parsed value of the Range: header. If either the `start` or `end` are
+ * omitted, then `null` will be returned.
+ *
+ * @private
+ */
+function parseRangeHeader(rangeHeader: string): {start?: number; end?: number} {
+  if (process.env.NODE_ENV !== 'production') {
+    assert!.isType(rangeHeader, 'string', {
+      moduleName: 'workbox-range-requests',
+      funcName: 'parseRangeHeader',
+      paramName: 'rangeHeader',
+    });
+  }
+
+  const normalizedRangeHeader = rangeHeader.trim().toLowerCase();
+  if (!normalizedRangeHeader.startsWith('bytes=')) {
+    throw new WorkboxError('unit-must-be-bytes', {normalizedRangeHeader});
+  }
+
+  // Specifying multiple ranges separate by commas is valid syntax, but this
+  // library only attempts to handle a single, contiguous sequence of bytes.
+  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Range#Syntax
+  if (normalizedRangeHeader.includes(',')) {
+    throw new WorkboxError('single-range-only', {normalizedRangeHeader});
+  }
+
+  const rangeParts = /(\d*)-(\d*)/.exec(normalizedRangeHeader);
+  // We need either at least one of the start or end values.
+  if (!rangeParts || !(rangeParts[1] || rangeParts[2])) {
+    throw new WorkboxError('invalid-range-values', {normalizedRangeHeader});
+  }
+
+  return {
+    start: rangeParts[1] === '' ? undefined : Number(rangeParts[1]),
+    end: rangeParts[2] === '' ? undefined : Number(rangeParts[2]),
+  };
+}
+
+export {parseRangeHeader};
Index: frontend/node_modules/workbox-range-requests/tsconfig.json
===================================================================
--- frontend/node_modules/workbox-range-requests/tsconfig.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/tsconfig.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,10 @@
+{
+  "extends": "../../tsconfig",
+  "compilerOptions": {
+    "outDir": "./",
+    "rootDir": "./src",
+    "tsBuildInfoFile": "./tsconfig.tsbuildinfo"
+  },
+  "include": ["src/**/*.ts"],
+  "references": [{"path": "../workbox-core/"}]
+}
Index: frontend/node_modules/workbox-range-requests/tsconfig.tsbuildinfo
===================================================================
--- frontend/node_modules/workbox-range-requests/tsconfig.tsbuildinfo	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/tsconfig.tsbuildinfo	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
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Index: frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.d.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,16 @@
+import '../_version.js';
+/**
+ * @param {Blob} blob A source blob.
+ * @param {number} [start] The offset to use as the start of the
+ * slice.
+ * @param {number} [end] The offset to use as the end of the slice.
+ * @return {Object} An object with `start` and `end` properties, reflecting
+ * the effective boundaries to use given the size of the blob.
+ *
+ * @private
+ */
+declare function calculateEffectiveBoundaries(blob: Blob, start?: number, end?: number): {
+    start: number;
+    end: number;
+};
+export { calculateEffectiveBoundaries };
Index: frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.js
===================================================================
--- frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,57 @@
+/*
+  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.
+*/
+import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
+import { assert } from 'workbox-core/_private/assert.js';
+import '../_version.js';
+/**
+ * @param {Blob} blob A source blob.
+ * @param {number} [start] The offset to use as the start of the
+ * slice.
+ * @param {number} [end] The offset to use as the end of the slice.
+ * @return {Object} An object with `start` and `end` properties, reflecting
+ * the effective boundaries to use given the size of the blob.
+ *
+ * @private
+ */
+function calculateEffectiveBoundaries(blob, start, end) {
+    if (process.env.NODE_ENV !== 'production') {
+        assert.isInstance(blob, Blob, {
+            moduleName: 'workbox-range-requests',
+            funcName: 'calculateEffectiveBoundaries',
+            paramName: 'blob',
+        });
+    }
+    const blobSize = blob.size;
+    if ((end && end > blobSize) || (start && start < 0)) {
+        throw new WorkboxError('range-not-satisfiable', {
+            size: blobSize,
+            end,
+            start,
+        });
+    }
+    let effectiveStart;
+    let effectiveEnd;
+    if (start !== undefined && end !== undefined) {
+        effectiveStart = start;
+        // Range values are inclusive, so add 1 to the value.
+        effectiveEnd = end + 1;
+    }
+    else if (start !== undefined && end === undefined) {
+        effectiveStart = start;
+        effectiveEnd = blobSize;
+    }
+    else if (end !== undefined && start === undefined) {
+        effectiveStart = blobSize - end;
+        effectiveEnd = blobSize;
+    }
+    return {
+        start: effectiveStart,
+        end: effectiveEnd,
+    };
+}
+export { calculateEffectiveBoundaries };
Index: frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.mjs
===================================================================
--- frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/utils/calculateEffectiveBoundaries.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+export * from './calculateEffectiveBoundaries.js';
Index: frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.d.ts
===================================================================
--- frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,14 @@
+import '../_version.js';
+/**
+ * @param {string} rangeHeader A Range: header value.
+ * @return {Object} An object with `start` and `end` properties, reflecting
+ * the parsed value of the Range: header. If either the `start` or `end` are
+ * omitted, then `null` will be returned.
+ *
+ * @private
+ */
+declare function parseRangeHeader(rangeHeader: string): {
+    start?: number;
+    end?: number;
+};
+export { parseRangeHeader };
Index: frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.js
===================================================================
--- frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,47 @@
+/*
+  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.
+*/
+import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
+import { assert } from 'workbox-core/_private/assert.js';
+import '../_version.js';
+/**
+ * @param {string} rangeHeader A Range: header value.
+ * @return {Object} An object with `start` and `end` properties, reflecting
+ * the parsed value of the Range: header. If either the `start` or `end` are
+ * omitted, then `null` will be returned.
+ *
+ * @private
+ */
+function parseRangeHeader(rangeHeader) {
+    if (process.env.NODE_ENV !== 'production') {
+        assert.isType(rangeHeader, 'string', {
+            moduleName: 'workbox-range-requests',
+            funcName: 'parseRangeHeader',
+            paramName: 'rangeHeader',
+        });
+    }
+    const normalizedRangeHeader = rangeHeader.trim().toLowerCase();
+    if (!normalizedRangeHeader.startsWith('bytes=')) {
+        throw new WorkboxError('unit-must-be-bytes', { normalizedRangeHeader });
+    }
+    // Specifying multiple ranges separate by commas is valid syntax, but this
+    // library only attempts to handle a single, contiguous sequence of bytes.
+    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Range#Syntax
+    if (normalizedRangeHeader.includes(',')) {
+        throw new WorkboxError('single-range-only', { normalizedRangeHeader });
+    }
+    const rangeParts = /(\d*)-(\d*)/.exec(normalizedRangeHeader);
+    // We need either at least one of the start or end values.
+    if (!rangeParts || !(rangeParts[1] || rangeParts[2])) {
+        throw new WorkboxError('invalid-range-values', { normalizedRangeHeader });
+    }
+    return {
+        start: rangeParts[1] === '' ? undefined : Number(rangeParts[1]),
+        end: rangeParts[2] === '' ? undefined : Number(rangeParts[2]),
+    };
+}
+export { parseRangeHeader };
Index: frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.mjs
===================================================================
--- frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/workbox-range-requests/utils/parseRangeHeader.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+export * from './parseRangeHeader.js';