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3.23.3 is no longer maintained and not recommended for usage due to the number of issues.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 in old core-js versions could cause a slowdown up to 100x even if nothing is polyfilled. Some versions have web compatibility issues. Please, upgrade your dependencies to the actual version of core-js.”

Please consider using one of the better solutions below.

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