Add moment.js as a dependency, enhance TypeScript configuration to exclude scripts, and introduce new examples for dependency injection and health checks.

src/lang/Events.ts

@@ -0,0 +1,53 @@
+import {EventEmitter} from 'events';
+import type IDisposable from './IDisposable';
+import Disposable from './Disposable';
+
+type EventListener = (...args: unknown[]) => void | Promise<void>;
+
+export class Events {
+  private readonly _events: EventEmitter;
+
+  constructor() {
+    this._events = new EventEmitter();
+  }
+
+  public on(event: string, listener: EventListener): IDisposable {
+    const wrappedListener = async (...eventArguments: unknown[]) => {
+      try {
+        await listener.apply(this, eventArguments);
+      } catch (e) {
+        console.error('Failed to process event [%s] with listener [%s]', event, listener, e);
+      }
+    };
+
+    this._events.on(event, wrappedListener);
+
+    return new Disposable(() => {
+      this._events.removeListener(event, wrappedListener);
+    });
+  }
+
+  public once(event: string, listener: EventListener): IDisposable {
+    const wrappedListener = async (...eventArguments: unknown[]) => {
+      try {
+        await listener.apply(this, eventArguments);
+      } catch (e) {
+        console.error('Failed to process event [%s] with listener [%s]', event, listener, e);
+      }
+    };
+
+    this._events.once(event, wrappedListener);
+
+    return new Disposable(() => {
+      this._events.removeListener(event, wrappedListener);
+    });
+  }
+
+  public emit(event: string, ...eventArguments: unknown[]): boolean {
+    return this._events.emit(event, ...eventArguments);
+  }
+
+  public listenerCount(event: string): number {
+    return this._events.listenerCount(event);
+  }
+}