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-regex-util/build/index.js

@@ -0,0 +1,52 @@
+/*!
+ * /**
+ *  * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *  *
+ *  * This source code is licensed under the MIT license found in the
+ *  * LICENSE file in the root directory of this source tree.
+ *  * /
+ */
+/******/ (() => { // webpackBootstrap
+/******/ 	"use strict";
+var __webpack_exports__ = {};
+// This entry needs to be wrapped in an IIFE because it uses a non-standard name for the exports (exports).
+(() => {
+var exports = __webpack_exports__;
+
+
+Object.defineProperty(exports, "__esModule", ({
+  value: true
+}));
+exports.replacePathSepForRegex = exports.escapeStrForRegex = exports.escapePathForRegex = void 0;
+var _path = require("path");
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+
+const escapePathForRegex = dir => {
+  if (_path.sep === '\\') {
+    // Replace "\" with "/" so it's not escaped by escapeStrForRegex.
+    // replacePathSepForRegex will convert it back.
+    dir = dir.replaceAll('\\', '/');
+  }
+  return replacePathSepForRegex(escapeStrForRegex(dir));
+};
+exports.escapePathForRegex = escapePathForRegex;
+const escapeStrForRegex = string => string.replaceAll(/[$()*+.?[\\\]^{|}]/g, '\\$&');
+exports.escapeStrForRegex = escapeStrForRegex;
+const replacePathSepForRegex = string => {
+  if (_path.sep === '\\') {
+    return string.replaceAll(/(\/|(.)?\\(?![$()*+.?[\\\]^{|}]))/g, (_match, _, p2) => p2 && p2 !== '\\' ? `${p2}\\\\` : '\\\\');
+  }
+  return string;
+};
+exports.replacePathSepForRegex = replacePathSepForRegex;
+})();
+
+module.exports = __webpack_exports__;
+/******/ })()
+;