Schema argument type with zfd

[nehalist]

Hey there,

I've got a function like this:

function create<TData>(
  schema: z.Schema<TData>,
  cb: (input: z.infer<typeof schema>) => void,
) {
  return function (
    data: FormData,
  ) {
    cb(schema.parse(data));
  };
}

What type has schema to be in order for this function to be typed correctly? My schema looks something like this:

const settingsFormSchema = zfd.formData({
  firstName: zfd.text(z.string()),
  lastName: zfd.text(z.string()),
});

And I like to use it like

const fn = create(
  settingsFormSchema,
  input => {
    input.firstName // should be typed correctly
  }
);

The impl shown here causes Types of property _input are incompatible. - but I just can't figure out the proper types.

Any tips? Thanks!

Edit:

It works with

schema: z.ZodEffects<z.ZodObject<TData>, z.output<ZodObject<TData>>, unknown>,

But I have honestly no idea why I need unknown here.