ZodSchemaClassOf extend

src/util/extend.ts

@@ -0,0 +1,40 @@
+/**
+ * Represents the common keys between two types.
+ * @template A - The first type.
+ * @template B - The second type.
+ */
+export type CommonKeys<A, B> = Extract<keyof A, keyof B>
+
+/**
+ * Merges an inheritance tree defined by an array of types, considering overrides.
+ * @template T - An array of types representing the inheritance tree.
+ */
+export type Extend<T extends readonly any[]> = (
+    T extends [infer Super, infer Self, ...infer Rest]
+        ? Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>>
+            ? Extend<[
+                Omit<Super, CommonKeys<Self, Super>> & Self,
+                ...Rest,
+            ]>
+            : never
+        : T extends [infer Self]
+            ? Self
+            : void
+)
+
+/**
+ * Merges an inheritance tree defined by an array of types without allowing overrides.
+ * @template T - An array of types representing the inheritance tree.
+ */
+export type ExtendWithoutOverriding<T extends readonly any[]> = (
+    T extends [infer Super, infer Self, ...infer Rest]
+        ? Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>>
+            ? ExtendWithoutOverriding<[
+                Super & Self,
+                ...Rest,
+            ]>
+            : never
+        : T extends [infer Self]
+            ? Self
+            : void
+)