src/vs/platform/terminal/node/ptyHostService.ts/PtyHostService/_handleHeartbeatFirstTimeout
class PtyHostService:	private _handleHeartbeatFirstTimeout() {
		this._logService.warn(`No ptyHost heartbeat after ${HeartbeatConstants.BeatInterval * HeartbeatConstants.FirstWaitMultiplier / 1000} seconds`);
		this._heartbeatFirstTimeout = undefined;
		this._heartbeatSecondTimeout = setTimeout(() => this._handleHeartbeatSecondTimeout(), HeartbeatConstants.BeatInterval * HeartbeatConstants.SecondWaitMultiplier);
	}