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-watcher/build/JestHooks.js

@@ -0,0 +1,91 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = void 0;
+
+function _defineProperty(obj, key, value) {
+  if (key in obj) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+  return obj;
+}
+
+/**
+ * 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.
+ */
+class JestHooks {
+  constructor() {
+    _defineProperty(this, '_listeners', void 0);
+
+    _defineProperty(this, '_subscriber', void 0);
+
+    _defineProperty(this, '_emitter', void 0);
+
+    this._listeners = {
+      onFileChange: [],
+      onTestRunComplete: [],
+      shouldRunTestSuite: []
+    };
+    this._subscriber = {
+      onFileChange: fn => {
+        this._listeners.onFileChange.push(fn);
+      },
+      onTestRunComplete: fn => {
+        this._listeners.onTestRunComplete.push(fn);
+      },
+      shouldRunTestSuite: fn => {
+        this._listeners.shouldRunTestSuite.push(fn);
+      }
+    };
+    this._emitter = {
+      onFileChange: fs =>
+        this._listeners.onFileChange.forEach(listener => listener(fs)),
+      onTestRunComplete: results =>
+        this._listeners.onTestRunComplete.forEach(listener =>
+          listener(results)
+        ),
+      shouldRunTestSuite: async testSuiteInfo => {
+        const result = await Promise.all(
+          this._listeners.shouldRunTestSuite.map(listener =>
+            listener(testSuiteInfo)
+          )
+        );
+        return result.every(Boolean);
+      }
+    };
+  }
+
+  isUsed(hook) {
+    var _this$_listeners$hook;
+
+    return (
+      ((_this$_listeners$hook = this._listeners[hook]) === null ||
+      _this$_listeners$hook === void 0
+        ? void 0
+        : _this$_listeners$hook.length) > 0
+    );
+  }
+
+  getSubscriber() {
+    return this._subscriber;
+  }
+
+  getEmitter() {
+    return this._emitter;
+  }
+}
+
+var _default = JestHooks;
+exports.default = _default;