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/@testing-library/user-event/dist/utils/edit/isEditable.js

@@ -0,0 +1,42 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.editableInputTypes = void 0;
+exports.isEditable = isEditable;
+exports.isEditableInput = isEditableInput;
+
+var _isElementType = require("../misc/isElementType");
+
+var _isContentEditable = require("./isContentEditable");
+
+function isEditable(element) {
+  return isEditableInput(element) || (0, _isElementType.isElementType)(element, 'textarea', {
+    readOnly: false
+  }) || (0, _isContentEditable.isContentEditable)(element);
+}
+
+let editableInputTypes;
+exports.editableInputTypes = editableInputTypes;
+
+(function (editableInputTypes) {
+  editableInputTypes["text"] = "text";
+  editableInputTypes["date"] = "date";
+  editableInputTypes["datetime-local"] = "datetime-local";
+  editableInputTypes["email"] = "email";
+  editableInputTypes["month"] = "month";
+  editableInputTypes["number"] = "number";
+  editableInputTypes["password"] = "password";
+  editableInputTypes["search"] = "search";
+  editableInputTypes["tel"] = "tel";
+  editableInputTypes["time"] = "time";
+  editableInputTypes["url"] = "url";
+  editableInputTypes["week"] = "week";
+})(editableInputTypes || (exports.editableInputTypes = editableInputTypes = {}));
+
+function isEditableInput(element) {
+  return (0, _isElementType.isElementType)(element, 'input', {
+    readOnly: false
+  }) && Boolean(editableInputTypes[element.type]);
+}