diff --git a/packages/oauth-server/src/util/object.ts b/packages/oauth-server/src/util/object.ts
deleted file mode 100644
index f8c87c241c7..00000000000
--- a/packages/oauth-server/src/util/object.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-export type DeepReadonly<T> = T extends [infer A, ...infer B]
-  ? readonly [DeepReadonly<A>, ...DeepReadonly<B>]
-  : T extends Array<infer A>
-  ? ReadonlyArray<DeepReadonly<A>>
-  : T extends object
-  ? { readonly [P in keyof T]: DeepReadonly<T[P]> }
-  : T
-
-export function deepFreeze<T>(input: T): DeepReadonly<T> {
-  if (input != null && typeof input === 'object') {
-    Object.freeze(input)
-    for (const prop of Object.getOwnPropertyNames(input)) {
-      const value = input[prop]
-      if (value != null && typeof value === 'object') {
-        deepFreeze(value)
-      }
-    }
-  }
-  return input as DeepReadonly<T>
-}