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-jasmine2/build/jasmine/JsApiReporter.d.ts

@@ -0,0 +1,31 @@
+/**
+ * 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 { Reporter, RunDetails } from '../types';
+import type { SpecResult } from './Spec';
+import type { SuiteResult } from './Suite';
+import type Timer from './Timer';
+export default class JsApiReporter implements Reporter {
+    started: boolean;
+    finished: boolean;
+    runDetails: RunDetails;
+    jasmineStarted: (runDetails: RunDetails) => void;
+    jasmineDone: (runDetails: RunDetails) => void;
+    status: () => unknown;
+    executionTime: () => unknown;
+    suiteStarted: (result: SuiteResult) => void;
+    suiteDone: (result: SuiteResult) => void;
+    suiteResults: (index: number, length: number) => Array<SuiteResult>;
+    suites: () => Record<string, SuiteResult>;
+    specResults: (index: number, length: number) => Array<SpecResult>;
+    specDone: (result: SpecResult) => void;
+    specs: () => Array<SpecResult>;
+    specStarted: (spec: SpecResult) => void;
+    constructor(options: {
+        timer?: Timer;
+    });
+}