Check _isMockFunction is true rather than truthy

Fixes jestjs#7009
danrr · Sep 21, 2018 · a851e42 · a851e42
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -13,6 +13,7 @@
 - `[jest-haste-map]` Fixed Haste whitelist generation for scoped modules on Windows ([#6980](https://github.com/facebook/jest/pull/6980))
 - `[jest-mock]` Fix inheritance of static properties and methods in mocks ([#7003](https://github.com/facebook/jest/pull/7003))
 - `[jest-mock]` Fix mocking objects without `Object.prototype` in their prototype chain ([#7003](https://github.com/facebook/jest/pull/7003))
+- `[jest-runtime]` Check `globalMock._isMockFunction` is true rather than truthy ([#7017](https://github.com/facebook/jest/pull/7017))
 
 ### Chore & Maintenance
 

diff --git a/packages/jest-runtime/src/index.js b/packages/jest-runtime/src/index.js
@@ -430,7 +430,7 @@ class Runtime {
           (typeof globalMock === 'object' && globalMock !== null) ||
           typeof globalMock === 'function'
         ) {
-          globalMock._isMockFunction && globalMock.mockClear();
+          globalMock._isMockFunction === true && globalMock.mockClear();
         }
       });