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/webpack-dev-server/lib/servers/BaseServer.js

@@ -0,0 +1,18 @@
+"use strict";
+
+/** @typedef {import("../Server").ClientConnection} ClientConnection */
+
+// base class that users should extend if they are making their own
+// server implementation
+module.exports = class BaseServer {
+  /**
+   * @param {import("../Server")} server
+   */
+  constructor(server) {
+    /** @type {import("../Server")} */
+    this.server = server;
+
+    /** @type {ClientConnection[]} */
+    this.clients = [];
+  }
+};