Error: Can't resolve 'core-js/es7/reflect' in '/Users/paulhan/Desktop/code/varsity/varsity-tech-assessment/src' code example

Example: Module not found: Error: Can't resolve 'core-js/es7/reflect'

// Change import in polyfills.ts
import 'core-js/es7/reflect';
// for
import 'core-js/es/reflect';