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/es-abstract/2020/HasOwnProperty.js

@@ -0,0 +1,20 @@
+'use strict';
+
+var $TypeError = require('es-errors/type');
+
+var hasOwn = require('hasown');
+var isObject = require('es-object-atoms/isObject');
+
+var isPropertyKey = require('../helpers/isPropertyKey');
+
+// https://262.ecma-international.org/6.0/#sec-hasownproperty
+
+module.exports = function HasOwnProperty(O, P) {
+	if (!isObject(O)) {
+		throw new $TypeError('Assertion failed: `O` must be an Object');
+	}
+	if (!isPropertyKey(P)) {
+		throw new $TypeError('Assertion failed: `P` must be a Property Key');
+	}
+	return hasOwn(O, P);
+};