Show error or throw error on emit('event', { some: 'data' })

[bluepuma77]

When using emit('event', { some: 'data' }), it seems nothing is sent to the client, and no error message is shown or thrown.

It would be great if a notice would be provided to the developer that they use wrong parameter format.

[razshare]

Hello @bluepuma77 ,
emit() doesn't throw errors, it returns Unsafe<void>, which is an Either<L,R> in disguise, in this case L being void and R an Error.

import { produce } from 'sveltekit-sse';

export function POST() {
  return produce(async function start({ emit }) {
    while (true) {
      const { error } = await emit('event', { some: 'data' });
      if (error) {
        console.error(`There's been an error.\n${error.message}`);
        return;
      }
    }
  });
}

When it comes to static analysis, I'm getting a type error as expected -

Let me know if this solves your issue.

[razshare]

I'm closing this issue due to inactivity.
Feel free to open another issue or follow up here if you think it should be reopened.