[BUG] `useAction` data can be undefined even `onSuccess`

Are you using the latest version of this library?

[X] I verified that the issue exists in the latest next-safe-action release

Is there an existing issue for this?

[X] I have searched the existing issues and found nothing that matches

Describe the bug

Hello, thank you for this great plugin!

Since I updated from "next-safe-action": "^7.0.0-next.32" to next-safe-action": "^7.7.0" I get the following error everywhere in my code base.

Example:

export const testAction = actionClient
  .action(async (args) => {
    return "Sample String";
  })

// In component:
const t = useAction(testAction, {
  onSuccess: (args) => {
    arr.push(args.data); // Argument of type string | undefined is not assignable to parameter of type string
  },
});

args.data has the following type: string | undefined, even though if the action succeeds (onSuccess), the returned data is always string. This happens to all types such as objects that get returned from the database.

Maybe I am missing something?

Thanks for your help :)

Reproduction steps

Put code as stated above and see typescript error.

Expected behavior

onSuccess args.data type should not be possibly undefined.

Minimal reproduction example

https://rb.gy/91uk80

Operating System

Windows 10

Library version

7.7.0

Next.js version

14.2.3

Additional context

No response

TheEdoRan / next-safe-action