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-webpack-plugin/build/lib/get-sourcemap-asset-name.d.ts

@@ -0,0 +1,20 @@
+import type { Compilation } from 'webpack';
+/**
+ * If our bundled swDest file contains a sourcemap, we would invalidate that
+ * mapping if we just replaced injectionPoint with the stringified manifest.
+ * Instead, we need to update the swDest contents as well as the sourcemap
+ * at the same time.
+ *
+ * See https://github.com/GoogleChrome/workbox/issues/2235
+ *
+ * @param {Object} compilation The current webpack compilation.
+ * @param {string} swContents The contents of the swSrc file, which may or
+ * may not include a valid sourcemap comment.
+ * @param {string} swDest The configured swDest value.
+ * @return {string|undefined} If the swContents contains a valid sourcemap
+ * comment pointing to an asset present in the compilation, this will return the
+ * name of that asset. Otherwise, it will return undefined.
+ *
+ * @private
+ */
+export declare function getSourcemapAssetName(compilation: Compilation, swContents: string, swDest: string): string | undefined;