Deeply freeze object

source/types.ts

@@ -0,0 +1,11 @@
+/**
+ * A deeply readonly type.
+ * @template T - The type to make deeply readonly.
+ * @returns The deeply readonly type.
+ */
+export type DeeplyReadonly<T> = {
+  readonly [K in keyof T]:
+    T[K] extends (...args: never[]) => unknown
+      ? T[K]
+      : DeeplyReadonly<T[K]>;
+};