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/enhanced-resolve/lib/ResultPlugin.js

@@ -0,0 +1,43 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("./Resolver")} Resolver */
+/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
+
+module.exports = class ResultPlugin {
+	/**
+	 * @param {ResolveStepHook} source source
+	 */
+	constructor(source) {
+		this.source = source;
+	}
+
+	/**
+	 * @param {Resolver} resolver the resolver
+	 * @returns {void}
+	 */
+	apply(resolver) {
+		this.source.tapAsync(
+			"ResultPlugin",
+			(request, resolverContext, callback) => {
+				const obj = { ...request };
+				if (resolverContext.log) {
+					resolverContext.log(`reporting result ${obj.path}`);
+				}
+				resolver.hooks.result.callAsync(obj, resolverContext, (err) => {
+					if (err) return callback(err);
+					if (typeof resolverContext.yield === "function") {
+						resolverContext.yield(obj);
+						callback(null, null);
+					} else {
+						callback(null, obj);
+					}
+				});
+			},
+		);
+	}
+};