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/jest-resolve/build/defaultResolver.d.ts

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+import type { Config } from '@jest/types';
+import { PkgJson } from './fileWalkers';
+interface ResolverOptions {
+    basedir: Config.Path;
+    browser?: boolean;
+    conditions?: Array<string>;
+    defaultResolver: typeof defaultResolver;
+    extensions?: Array<string>;
+    moduleDirectory?: Array<string>;
+    paths?: Array<Config.Path>;
+    rootDir?: Config.Path;
+    packageFilter?: (pkg: PkgJson, dir: string) => PkgJson;
+    pathFilter?: (pkg: PkgJson, path: string, relativePath: string) => string;
+}
+declare global {
+    namespace NodeJS {
+        interface ProcessVersions {
+            pnp?: any;
+        }
+    }
+}
+export default function defaultResolver(path: Config.Path, options: ResolverOptions): Config.Path;
+export {};