DeepMap error when spreading on `defaultValues`

Describe the bug A clear and concise description of what the bug is.

To Reproduce

Go to sandbox.

View the defaultValues section – comment out the spreaded and uncomment the non spreaded… notice the typescript error difference

Codesandbox link (Required)

https://codesandbox.io/s/dry-violet-z0tpe

Expected behavior

Types inferred without DeepMap error on the overridden defaultValues

Screenshots

Additional context

RHF 6.9.5

[bluebill1049]

FYI @kotarella1110 I made the following change on DeepPartial.

-export type DeepPartial<T> = T extends Array<infer U>
-  ? Array<DeepPartial<U>>
-  : T extends ReadonlyArray<infer U>
-    ? ReadonlyArray<DeepPartial<U>>
-    : T extends Record<string, unknown>
-      ? {
-        [K in keyof T]?: DeepPartial<T[K]>;
-      }
-      : T;
+export type DeepPartial<T> = T extends Primitive
+  ? Partial<T>
+  : {
+      [P in keyof T]?: T[P] extends (infer U)[]
+        ? DeepPartial<U>[]
+        : T[P] extends Readonly<infer U>[]
+        ? Readonly<DeepPartial<U>>[]
+        : DeepPartial<T[P]>;
+    };

I think this issue is related as well: https://github.com/react-hook-form/react-hook-form/issues/3289

here is a CSB that was working correctly with the generic: https://codesandbox.io/s/pedantic-perlman-f93x8?file=/src/App.tsx:0-296 however I can spot the type is actually any, correct me if I am wrong, we will need to have the generic at useForm to fix those issues.

[bluebill1049]

Yes I suppose that works by explicitly passing the generic, but I wonder if it can be inferred on the deep map?

Yes, @kotarella1110 is investigating a solution. worse case we will have to use with passing the generic.