explicitly type cast to unknown

Author: Lms24

packages/core/src/utils-hoist/object.ts

@@ -25,7 +25,9 @@ export function fill(source: { [key: string]: any }, name: string, replacementFa
     return;
   }
 
-  const original = source[name];
+  // explicitly casting to unknown because we don't know the type of the method initially at all
+  const original = source[name] as unknown;
+
   if (typeof original !== 'function') {
     return;
   }

packages/core/test/utils-hoist/object.test.ts

@@ -63,7 +63,7 @@ describe('fill()', () => {
 
     fill(source, name, replacement);
 
-    expect(source.foo).toEqual(propValue);
+    expect(source.foo).toBe(propValue);
     expect(replacement).not.toBeCalled();
   });