Function extractCommand

packages/client-multi/src/Foldr.ts:318–324

* The legacy code read `res.body.command[1]` — body.command is an array * shaped `[status, commandString]`. Pull the string out defensively.

(res: FoldrPushResponse | null)

 * shaped `[status, commandString]`. Pull the string out defensively.
 */
function extractCommand(res: FoldrPushResponse | null): string | undefined {
  if (!res) return undefined;
  const cmd = res.command;
  if (Array.isArray(cmd) && typeof cmd[1] === 'string') return cmd[1];
  if (typeof cmd === 'string') return cmd;
  return undefined;
}