Add server events emitter

index.d.ts

@@ -1,8 +1,36 @@
-import { UserDirectoryList, User } from "./src/users";
-import { CommandLineArguments } from "./src/command-line";
-import { CsrfSyncedToken } from "csrf-sync";
+import { EventEmitter } from 'node:events';
+import { CsrfSyncedToken } from 'csrf-sync';
+import { UserDirectoryList, User } from './src/users.js';
+import { CommandLineArguments } from './src/command-line.js';
+import { EVENT_NAMES } from './src/server-events.js';
+
+/**
+ * Event payload for SERVER_STARTED event.
+ */
+export interface ServerStartedEvent {
+    /**
+     * The URL the server is listening on.
+     */
+    url: URL;
+}
+
+/**
+ * Map of all server events to their payload types.
+ */
+export interface ServerEventMap {
+    [EVENT_NAMES.SERVER_STARTED]: [ServerStartedEvent];
+}
 
 declare global {
+    declare namespace NodeJS {
+        export interface Process {
+            /**
+             * A global instance of the server events emitter.
+             */
+            serverEvents: EventEmitter<ServerEventMap>;
+        }
+    }
+
     declare namespace CookieSessionInterfaces {
         export interface CookieSessionObject {
             /**

server.js

@@ -20,6 +20,7 @@ import bodyParser from 'body-parser';
 import open from 'open';
 
 // local library imports
+import { serverEvents, EVENT_NAMES } from './src/server-events.js';
 import { CommandLineParser } from './src/command-line.js';
 import { loadPlugins } from './src/plugin-loader.js';
 import {
@@ -348,6 +349,7 @@ async function postSetupTasks(result) {
     console.log('\n' + getSeparator(plainGoToLog.length) + '\n');
 
     setupLogLevel();
+    serverEvents.emit(EVENT_NAMES.SERVER_STARTED, { url: autorunUrl });
 }
 
 /**

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',
+});