Route a rejecting async listener to sessionError instead of the process

src/server.ts

@@ -58,7 +58,7 @@ export class SmppServer extends EventEmitter<ServerEvents> {
 	private readonly server: NetServer;
 
 	constructor(server: NetServer, log: SmppLog) {
-		super();
+		super({ captureRejections: true });
 		this.log = log;
 		this.server = server;
 	}
@@ -89,6 +89,18 @@ export class SmppServer extends EventEmitter<ServerEvents> {
 		}
 	}
 
+	/** The same guard for a listener that rejects rather than throws; captureRejections routes here. */
+	override [EventEmitter.captureRejectionSymbol](
+		error: Error,
+		...args: [event: keyof ServerEvents, ...rest: unknown[]]
+	): void {
+		const [event] = args;
+
+		this.log.error('server - a listener rejected', { event, message: error.message });
+
+		if (event !== 'serverError') this.emit('serverError', error);
+	}
+
 	/** Stops listening and closes every live session. */
 	close(): Promise<void> {
 		return new Promise(resolve => {

src/session.ts

@@ -76,8 +76,20 @@ export class Session extends EventEmitter<SessionEvents> {
 		}
 	}
 
+	/** The same guard for a listener that rejects rather than throws; captureRejections routes here. */
+	override [EventEmitter.captureRejectionSymbol](
+		error: Error,
+		...args: [event: keyof SessionEvents, ...rest: unknown[]]
+	): void {
+		const [event] = args;
+
+		this.log.error('session - a listener rejected', { event, message: error.message });
+
+		if (event !== 'sessionError') this.emit('sessionError', error);
+	}
+
 	constructor(options: SessionOptions) {
-		super();
+		super({ captureRejections: true });
 
 		this.log = options.log ?? silentLog;
 		this.options = options;