src/vs/platform/terminal/node/ptyService.ts/PtyService/start
class PtyService:	async start(id: number): Promise<ITerminalLaunchError | undefined> {
		this._logService.trace('ptyService#start', id);
		const pty = this._ptys.get(id);
		return pty ? pty.start() : { message: `Could not find pty with id "${id}"` };
	}