Returning form errors from within a server action

[jokoso]

Hi there!

Thanks for this great lib! 🙌

I'm using an auth lib to sign in users using server actions and would like to manually return a form error, if for instance the username/password is incorrect. Something like this:

export const signInAction = actionClient
  .metadata({ actionName: 'signIn' })
  .inputSchema(inputSchema)
  .action(async ({ parsedInput, ctx }) => {
    try {
      const session = await auth.api.signInEmail({
        body: {
          email: parsedInput.email,
          password: parsedInput.password,
        },
      })
      // ...
    } catch (error) {
      if (error.code === 'INVALID_EMAIL_OR_PASSWORD') {
        // Return a form error 🤔
      }
    }
  })

Is there anything like returnValidationErrors for form errors, or would I need to validate credentials using refine on inputSchema? I would prefer to handle it in the action, as auth.api.signInEmail sets a cookie, so a session would be created twice, if I did it once in refine, to validate credentials, and then again in the action.