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/@pmmmwh/react-refresh-webpack-plugin/options/index.js

@@ -0,0 +1,32 @@
+/**
+ * Sets a constant default value for the property when it is undefined.
+ * @template T
+ * @template {keyof T} Property
+ * @param {T} object An object.
+ * @param {Property} property A property of the provided object.
+ * @param {T[Property]} [defaultValue] The default value to set for the property.
+ * @returns {T[Property]} The defaulted property value.
+ */
+const d = (object, property, defaultValue) => {
+  if (typeof object[property] === 'undefined' && typeof defaultValue !== 'undefined') {
+    object[property] = defaultValue;
+  }
+  return object[property];
+};
+
+/**
+ * Resolves the value for a nested object option.
+ * @template T
+ * @template {keyof T} Property
+ * @template Result
+ * @param {T} object An object.
+ * @param {Property} property A property of the provided object.
+ * @param {function(T | undefined): Result} fn The handler to resolve the property's value.
+ * @returns {Result} The resolved option value.
+ */
+const n = (object, property, fn) => {
+  object[property] = fn(object[property]);
+  return object[property];
+};
+
+module.exports = { d, n };