Uncaught Error: Cannot find module 'core-js/es6/reflect'​​ at ​wallabyTest.ts:1​ ... · Issue #2073 · wallabyjs/public · GitHub
![For polyfill es7/reflect, it should be mentioned that tests are not run in AOT mode · Issue #12148 · angular/angular-cli · GitHub For polyfill es7/reflect, it should be mentioned that tests are not run in AOT mode · Issue #12148 · angular/angular-cli · GitHub](https://user-images.githubusercontent.com/681956/48054480-a6dea100-e1ad-11e8-82ba-69eff874bb71.png)
For polyfill es7/reflect, it should be mentioned that tests are not run in AOT mode · Issue #12148 · angular/angular-cli · GitHub
![Upgrading an Existing Angular Application to CLI 7.3 for Conditional Polyfills | by Jared Youtsey | ngconf | Medium Upgrading an Existing Angular Application to CLI 7.3 for Conditional Polyfills | by Jared Youtsey | ngconf | Medium](https://miro.medium.com/v2/resize:fit:1400/1*krLhPoiuK4lAe2FYdrsglA.png)
Upgrading an Existing Angular Application to CLI 7.3 for Conditional Polyfills | by Jared Youtsey | ngconf | Medium
Module not found: Error: Can't resolve 'core-js/es7/reflect · Issue #573 · zloirock/core-js · GitHub
![javascript - Angular2 IE11 Unable to get property 'apply' of undefined or null reference - Stack Overflow javascript - Angular2 IE11 Unable to get property 'apply' of undefined or null reference - Stack Overflow](https://i.stack.imgur.com/wEIu2.png)