npm WARN deprecated core-js@2.6.11: core-js@
Indeed the issue was with cache. npm clean-install worked.
core-js
Error: Can’t resolve ‘core-js/es7/reflect’ in ‘\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models
You should install core-js@2.5.x that contains this file/module. See preset-env docs. Also note, however, that this is a very old version with known issues and is unsupported. From the module itself: “core-js@<3.23.3 is no longer maintained and not recommended for usage due to the number of issues. Because of the V8 engine whims, feature detection … Read more