src/vs/workbench/services/notification/common/notificationService.ts/NotificationService/warn
class NotificationService:	warn(message: NotificationMessage | NotificationMessage[]): void {
		if (Array.isArray(message)) {
			message.forEach(m => this.warn(m));

			return;
		}

		this.model.addNotification({ severity: Severity.Warning, message });
	}