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/jsx-ast-utils/lib/values/expressions/ThisExpression.js

@@ -0,0 +1,15 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromThisExpression;
+/**
+ * Extractor function for a ThisExpression type value node.
+ * A this expression is using `this` as an identifier.
+ *
+ * @returns - 'this' as a string.
+ */
+function extractValueFromThisExpression() {
+  return 'this';
+}