improve check

jestjs · Sep 7, 2021 · 3a04055 · 3a04055
1 parent 31106e9
commit 3a04055
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/jest-runtime/src/index.ts b/packages/jest-runtime/src/index.ts
@@ -1772,7 +1772,7 @@ export default class Runtime {
       mockFactory,
       options,
     ) => {
-      if (mockFactory === undefined) {
+      if (typeof mockFactory !== 'function') {
         throw new Error('`unstable_mockModule` must be passed a mock factory');
       }