Error: ./src/polyfills.ts Module not found: Error: Can't resolve 'core-js/es6/weak-map' in 'D:\godrejdocs\TFS\OneKM\Sprint7\Dev\Application\onekmsp\src' code example

Example: Module not found: Error: Can't resolve 'core-js/client/shim'

import 'core-js/es/symbol'