fix issue with set api (#11915)

* fix issue with set api

* remove test file

* add test coverage and update api contract

Author: bluebill1049

reports/api-extractor.md

@@ -531,6 +531,9 @@ export type ResolverSuccess<TFieldValues extends FieldValues = FieldValues> = {
     errors: {};
 };
 
+// @public (undocumented)
+export const set: (object: FieldValues, path: string, value?: unknown) => FieldValues | undefined;
+
 // @public (undocumented)
 export type SetFieldValue<TFieldValues extends FieldValues> = FieldValue<TFieldValues>;
 

src/__tests__/utils/set.test.ts

@@ -57,4 +57,9 @@ describe('set', () => {
       },
     });
   });
+
+  it('should not populate prototype', () => {
+    set({}, '__proto__[test2]', '456');
+    expect(Object.prototype).toEqual({});
+  });
 });

src/utils/index.ts

@@ -1,3 +1,4 @@
 import get from './get';
+import set from './set';
 
-export { get };
+export { get, set };

src/utils/set.ts

@@ -23,6 +23,11 @@ export default (object: FieldValues, path: string, value?: unknown) => {
           ? []
           : {};
     }
+
+    if (key === '__proto__') {
+      return;
+    }
+
     object[key] = newValue;
     object = object[key];
   }