Does it allow to send HTTP request in the callback function of batch API

[mrdulin]

I saw code like below, the code does not throw error at runtime. But I don't think put I/O operations in the callback function of batch is correct. However, I am not aware of what effects it might have. If it's a bad practice, please document this in the instructions.

batch(async () => {
  const res = await request(/***/);
  dispatch(action1(res));
  dispatch(action2(res));
})

[markerikson]

That callback is really meant for dispatching synchronous actions so that there's only one UI update.

That said, it's also obsolete as of React 18, as React 18 now always batches all queued renders within a single event loop tick. So, if you're using React 18, you don't need to use batch at all.