skip unmasking for types without fragments

.changeset/perfect-jobs-flow.md

@@ -0,0 +1,5 @@
+---
+"@apollo/client": patch
+---
+
+Add a helper that will skip the TS unmasking alorithm when no fragments are present on type level

src/masking/internal/types.ts

@@ -31,3 +31,10 @@ export type RemoveMaskedMarker<T> = Omit<T, "__masked">;
 // force distrubution when T is a union with | undefined
 export type RemoveFragmentName<T> =
   T extends any ? Omit<T, " $fragmentName"> : T;
+
+export type ContainsFragmentsRefs<TData> =
+  TData extends object ?
+    " $fragmentRefs" extends keyof TData ?
+      true
+    : ContainsFragmentsRefs<TData[keyof TData]>
+  : false;

src/masking/types.ts

@@ -1,5 +1,6 @@
 import type { TypedDocumentNode } from "@graphql-typed-document-node/core";
 import type {
+  ContainsFragmentsRefs,
   RemoveFragmentName,
   RemoveMaskedMarker,
   UnwrapFragmentRefs,
@@ -39,7 +40,8 @@ export type FragmentType<TData> =
 export type MaybeMasked<TData> =
   TData extends { __masked?: true } ? Prettify<RemoveMaskedMarker<TData>>
   : DataMasking extends { enabled: true } ? TData
-  : Unmasked<TData>;
+  : true extends ContainsFragmentsRefs<TData> ? Unmasked<TData>
+  : TData;
 
 /**
  * Unmasks a type to provide its full result.