fix(dev): only apply pretty types for objects

packages/remix-server-runtime/serialize.ts

@@ -3,6 +3,7 @@ import type { TypedDeferredData, TypedResponse } from "./responses";
 
 // force Typescript to simplify the type
 type Pretty<T> = { [K in keyof T]: T[K] } & {};
+type PrettyTransform<T, U> = [T] extends [U] ? T : Pretty<U>;
 
 type JsonPrimitive =
   | string
@@ -21,7 +22,7 @@ type NonJsonPrimitive = undefined | Function | symbol;
 type IsAny<T> = 0 extends 1 & T ? true : false;
 
 // prettier-ignore
-type Serialize<T> = Pretty<
+type Serialize<T> =
   IsAny<T> extends true ? any :
   T extends TypedDeferredData<infer U> ? SerializeDeferred<U> :
   T extends JsonPrimitive ? T :
@@ -30,9 +31,9 @@ type Serialize<T> = Pretty<
   T extends [] ? [] :
   T extends [unknown, ...unknown[]] ? SerializeTuple<T> :
   T extends ReadonlyArray<infer U> ? (U extends NonJsonPrimitive ? null : Serialize<U>)[] :
-  T extends object ? SerializeObject<UndefinedToOptional<T>> :
+  T extends object ? PrettyTransform<T, SerializeObject<UndefinedToOptional<T>>> :
   never
->;
+;
 
 /** JSON serialize [tuples](https://www.typescriptlang.org/docs/handbook/2/objects.html#tuple-types) */
 type SerializeTuple<T extends [unknown, ...unknown[]]> = {