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/2017/CreateMethodProperty.js

@@ -0,0 +1,38 @@
+'use strict';
+
+var $TypeError = require('es-errors/type');
+var isObject = require('es-object-atoms/isObject');
+
+var DefineOwnProperty = require('../helpers/DefineOwnProperty');
+
+var FromPropertyDescriptor = require('./FromPropertyDescriptor');
+var IsDataDescriptor = require('./IsDataDescriptor');
+var isPropertyKey = require('../helpers/isPropertyKey');
+var SameValue = require('./SameValue');
+
+// https://262.ecma-international.org/6.0/#sec-createmethodproperty
+
+module.exports = function CreateMethodProperty(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 newDesc = {
+		'[[Configurable]]': true,
+		'[[Enumerable]]': false,
+		'[[Value]]': V,
+		'[[Writable]]': true
+	};
+	return DefineOwnProperty(
+		IsDataDescriptor,
+		SameValue,
+		FromPropertyDescriptor,
+		O,
+		P,
+		newDesc
+	);
+};