src/vs/workbench/api/browser/mainThreadOutputService.ts/MainThreadOutputService/$reveal
class MainThreadOutputService:	public $reveal(channelId: string, preserveFocus: boolean): Promise<void> | undefined {
		const channel = this._getChannel(channelId);
		if (channel) {
			this._outputService.showChannel(channel.id, preserveFocus);
		}
		return undefined;
	}