Module not found: Can't resolve 'core-js/modules/es.array.slice' code example
Example 1: 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';
Example 2: Module not found: Error: Can't resolve 'core-js/client/shim'
import 'core-js/es/symbol'