diff --git a/types/relay-runtime/index.d.ts b/types/relay-runtime/index.d.ts
index 7af27e4934..c03d90e2d8 100644
--- a/types/relay-runtime/index.d.ts
+++ b/types/relay-runtime/index.d.ts
@@ -200,16 +200,10 @@ export { deepFreeze } from './lib/util/deepFreeze';
  * relay-compiler-language-typescript support for fragment references
  */
 
-/**
- * @private
- */
 export interface _RefType<Ref extends string> {
     ' $refType': Ref;
 }
 
-/**
- * @private
- */
 export interface _FragmentRefs<Refs extends string> {
     ' $fragmentRefs': FragmentRefs<Refs>;
 }
diff --git a/types/relay-runtime/lib/store/RelayStoreTypes.d.ts b/types/relay-runtime/lib/store/RelayStoreTypes.d.ts
index 32788c13fc..e29686cf3b 100644
--- a/types/relay-runtime/lib/store/RelayStoreTypes.d.ts
+++ b/types/relay-runtime/lib/store/RelayStoreTypes.d.ts
@@ -305,7 +305,7 @@ export type Scheduler = (callback: () => void) => void;
  * allowing different implementations that may e.g. create a changeset of
  * the modifications.
  */
-export type Unarray<T> = T extends Array<infer U> ? U : T;
+export type Unarray<T> = T extends Array<infer U> | ReadonlyArray<infer U> ? U : T;
 export type Primitive = string | number | boolean | null | undefined;
 
 export interface RecordProxy<T = {}> {