Add server events emitter

src/server-events.js

@@ -0,0 +1,21 @@
+import EventEmitter from 'node:events';
+import process from 'node:process';
+
+/**
+ * @typedef {import('../index').ServerEventMap} ServerEventMap
+ * @type {EventEmitter<ServerEventMap>} The default event source.
+ */
+export const serverEvents = new EventEmitter();
+process.serverEvents = serverEvents;
+export default serverEvents;
+
+/**
+ * @enum {string}
+ * @readonly
+ */
+export const EVENT_NAMES = Object.freeze({
+    /**
+     * Emitted when the server has started.
+     */
+    SERVER_STARTED: 'server-started',
+});