Type-safe body for useCompletion etc.

[umstek]

Feature Description

When calling the complete method returned by useCompletion (etc.), we can pass our own data like so:

  const {
    complete,
    completion,
    error,
    isLoading,
  } = useCompletion({
    api: `${config.baseURL}/ai/completion`,
  });

await complete(promptText, { body: { model: 'fast' } });

Currently, useCompletion doesn't accept type arguments. If it did, we could've made the body passed to complete type safe.

Use Cases

This would help us avoid mistakes.

Additional context

This is definitely not a high priority, but I believe it is a nice to have.