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/2018/CreateDataPropertyOrThrow.js

@@ -0,0 +1,24 @@
+'use strict';
+
+var $TypeError = require('es-errors/type');
+var isObject = require('es-object-atoms/isObject');
+
+var CreateDataProperty = require('./CreateDataProperty');
+
+var isPropertyKey = require('../helpers/isPropertyKey');
+
+// // https://262.ecma-international.org/6.0/#sec-createdatapropertyorthrow
+
+module.exports = function CreateDataPropertyOrThrow(O, P, V) {
+	if (!isObject(O)) {
+		throw new $TypeError('Assertion failed: Type(O) is not Object');
+	}
+	if (!isPropertyKey(P)) {
+		throw new $TypeError('Assertion failed: P is not a Property Key');
+	}
+	var success = CreateDataProperty(O, P, V);
+	if (!success) {
+		throw new $TypeError('unable to create data property');
+	}
+	return success;
+};