chore: test useTransform

Author: harry-whorlow

packages/react-form-nextjs/tests/useTransform.test-d.tsx

@@ -0,0 +1,27 @@
+import { expectTypeOf, it } from 'vitest'
+import { formOptions, mergeForm, useForm, useTransform } from '../src'
+import type { ServerFormState } from '../src'
+
+it('should maintain the type of the form', () => {
+  const state = {} as ServerFormState<any, any>
+
+  const formOpts = formOptions({
+    defaultValues: {
+      firstName: '',
+      age: 123,
+    } as const,
+  })
+
+  function Comp() {
+    const form = useForm({
+      ...formOpts,
+      transform: useTransform(
+        (baseForm) => mergeForm(baseForm, state),
+        [state],
+      ),
+    })
+
+    expectTypeOf(form.state.values.age).toEqualTypeOf<123>()
+    expectTypeOf(form.state.values.firstName).toEqualTypeOf<''>()
+  }
+})