src/vs/platform/debug/common/extensionHostDebugIpc.ts/ExtensionHostDebugBroadcastChannel/listen
class ExtensionHostDebugBroadcastChannel:	listen(ctx: TContext, event: string, arg?: any): Event<any> {
		switch (event) {
			case 'close':
				return this._onCloseEmitter.event;
			case 'reload':
				return this._onReloadEmitter.event;
			case 'terminate':
				return this._onTerminateEmitter.event;
			case 'attach':
				return this._onAttachEmitter.event;
		}
		throw new Error('Method not implemented.');
	}