What happens here during code splitting?

I was showing my friends some of my code with Tanstack Start but did not know how to properly answer the following question.

Take a look at this snippet

const addSessionHistoryEntryFn = useMutation({
  mutationFn: useServerFn((props) => {
    const { data } = props;
    return sessionHistoryEntryMutation({ data });
  }),
  onSuccess: async () => {
    handleInvalidation();
  },
  onError: (error) => console.error("Unable to store message: ", error),
});

const addSessionHistoryEntryFn = useMutation({
  mutationFn: useServerFn((props) => {
    const { data } = props;
    return sessionHistoryEntryMutation({ data });
  }),
  onSuccess: async () => {
    handleInvalidation();
  },
  onError: (error) => console.error("Unable to store message: ", error),
});

What happens here during code splitting - how does the browser call the server function using useServerFn. Does the server function make it to the client at all?

TanStack•13mo ago•

3 replies

dead-brown

What happens here during code splitting?

I was showing my friends some of my code with Tanstack Start but did not know how to properly answer the following question.

Take a look at this snippet

const addSessionHistoryEntryFn = useMutation({
  mutationFn: useServerFn((props) => {
    const { data } = props;
    return sessionHistoryEntryMutation({ data });
  }),
  onSuccess: async () => {
    handleInvalidation();
  },
  onError: (error) => console.error("Unable to store message: ", error),
});

const addSessionHistoryEntryFn = useMutation({
  mutationFn: useServerFn((props) => {
    const { data } = props;
    return sessionHistoryEntryMutation({ data });
  }),
  onSuccess: async () => {
    handleInvalidation();
  },
  onError: (error) => console.error("Unable to store message: ", error),
});

What happens here during code splitting - how does the browser call the server function using useServerFn. Does the server function make it to the client at all?

What happens here during code splitting?

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