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/AbstractEqualityComparison.js

@@ -0,0 +1,38 @@
+'use strict';
+
+var ToNumber = require('./ToNumber');
+var ToPrimitive = require('./ToPrimitive');
+
+var isSameType = require('../helpers/isSameType');
+
+var isObject = require('es-object-atoms/isObject');
+
+// https://262.ecma-international.org/6.0/#sec-abstract-equality-comparison
+
+module.exports = function AbstractEqualityComparison(x, y) {
+	if (isSameType(x, y)) {
+		return x === y; // ES6+ specified this shortcut anyways.
+	}
+	if (x == null && y == null) {
+		return true;
+	}
+	if (typeof x === 'number' && typeof y === 'string') {
+		return AbstractEqualityComparison(x, ToNumber(y));
+	}
+	if (typeof x === 'string' && typeof y === 'number') {
+		return AbstractEqualityComparison(ToNumber(x), y);
+	}
+	if (typeof x === 'boolean') {
+		return AbstractEqualityComparison(ToNumber(x), y);
+	}
+	if (typeof y === 'boolean') {
+		return AbstractEqualityComparison(x, ToNumber(y));
+	}
+	if ((typeof x === 'string' || typeof x === 'number' || typeof x === 'symbol') && isObject(y)) {
+		return AbstractEqualityComparison(x, ToPrimitive(y));
+	}
+	if (isObject(x) && (typeof y === 'string' || typeof y === 'number' || typeof y === 'symbol')) {
+		return AbstractEqualityComparison(ToPrimitive(x), y);
+	}
+	return false;
+};