no need to export deep partial and exclude non-pure-object stuff

types/shared.d.ts

@@ -5,12 +5,17 @@ export type { DefaultTheme } from './default-theme.js'
 
 export type Awaitable<T> = T | PromiseLike<T>
 
-// Beware that this may cause performance issues or infinite loops
+type DeepPartial<T> =
-// Use only when absolutely necessary
+  T extends Record<string, any>
-export type DeepPartial<T> = T extends object
+    ? T extends
-  ? {
+        | Date
-      [K in keyof T]?: DeepPartial<T[K]>
+        | RegExp
-    }
+        | Function
+        | ReadonlyMap<any, any>
+        | ReadonlySet<any>
+        | ReadonlyArray<any>
+      ? T
+      : { [P in keyof T]?: DeepPartial<T[P]> }
     : T
 
 export interface PageData {