Fixes #5073

Author: colinhacks

packages/zod/src/v4/core/schemas.ts

@@ -1721,7 +1721,7 @@ export const $ZodObject: core.$constructor<$ZodObject> = /*@__PURE__*/ core.$con
   const _normalized = util.cached(() => {
     const keys = Object.keys(def.shape);
     for (const k of keys) {
-      if (!(def.shape[k] instanceof $ZodType)) {
+      if (!def.shape[k]._zod.traits.has("$ZodType")) {
         throw new Error(`Invalid element at key "${k}": expected a Zod schema`);
       }
     }
@@ -3642,7 +3642,8 @@ export const $ZodTemplateLiteral: core.$constructor<$ZodTemplateLiteral> = /*@__
     $ZodType.init(inst, def);
     const regexParts: string[] = [];
     for (const part of def.parts) {
-      if (part instanceof $ZodType) {
+      if (typeof part === "object" && part !== null) {
+        // is Zod schema
         if (!part._zod.pattern) {
           // if (!source)
           throw new Error(`Invalid template literal part, no pattern found: ${[...(part as any)._zod.traits].shift()}`);

play.ts

@@ -2,16 +2,12 @@ import { z } from "zod/v4";
 
 z;
 
-console.log(
-  z
-    .object({
-      a: z.string(),
-    })
-    .transform((data) => {
-      return {
-        ...data,
-        tx: true,
-      };
-    })
-    .safeParse({ a: "1" })
-);
+// import { z } from "zod";
+const BrandedSchema = z.string().brand<"brand">();
+const WrappedSchema = z.object({ key: BrandedSchema });
+
+type bso = typeof BrandedSchema._output;
+type basdfasdfso = typeof BrandedSchema._zod.output;
+type wso = (typeof WrappedSchema._output)["key"];
+type bso2 = z.output<typeof BrandedSchema>;
+type wso2 = z.output<typeof WrappedSchema>["key"];