Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/workbox-core/_private.js

@@ -0,0 +1,24 @@
+/*
+  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.
+*/
+// We either expose defaults or we expose every named export.
+import { assert } from './_private/assert.js';
+import { cacheNames } from './_private/cacheNames.js';
+import { cacheMatchIgnoreParams } from './_private/cacheMatchIgnoreParams.js';
+import { canConstructReadableStream } from './_private/canConstructReadableStream.js';
+import { canConstructResponseFromBodyStream } from './_private/canConstructResponseFromBodyStream.js';
+import { dontWaitFor } from './_private/dontWaitFor.js';
+import { Deferred } from './_private/Deferred.js';
+import { executeQuotaErrorCallbacks } from './_private/executeQuotaErrorCallbacks.js';
+import { getFriendlyURL } from './_private/getFriendlyURL.js';
+import { logger } from './_private/logger.js';
+import { resultingClientExists } from './_private/resultingClientExists.js';
+import { timeout } from './_private/timeout.js';
+import { waitUntil } from './_private/waitUntil.js';
+import { WorkboxError } from './_private/WorkboxError.js';
+import './_version.js';
+export { assert, cacheMatchIgnoreParams, cacheNames, canConstructReadableStream, canConstructResponseFromBodyStream, dontWaitFor, Deferred, executeQuotaErrorCallbacks, getFriendlyURL, logger, resultingClientExists, timeout, waitUntil, WorkboxError, };