![serve - Error: Can't resolve 'core-js/es7/reflect' in '\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models - Stack Overflow serve - Error: Can't resolve 'core-js/es7/reflect' in '\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models - Stack Overflow](https://i.stack.imgur.com/XCSsR.png)
serve - Error: Can't resolve 'core-js/es7/reflect' in '\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models - Stack Overflow
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)