how to upgrad old version to new version angular project code example
Example 1: ng update @angular/core @angular/cli
npm uninstall -g angular-cli
npm install -g @angular/cli@latestExample 2: ng update @angular/core @angular/cli
rm -rf node_modules
npm uninstall --save-dev angular-cli
npm install --save-dev @angular/cli@latest
npm install