Upgrade Angular project from v11 to v13

I’m slow…. It’s been a while since I last touched my Angular repository, that was created in early 2020, running on Angular 11. When I just went back to it yesterday, I realised that so much has changed.

Tslint is now deprecated, and so was Protractor. But thanks to the documentations - https://www.bitovi.com/blog/angular-upgrades-painless-migration-from-tslint-to-eslint, and https://github.com/angular/protractor/issues/5502, migration of both of them from Tslint to Eslint, and protractor to cypress is a breeze.

Migrate tsLint to esLint:

ng add @angular-eslint/schematics

Migrate protractor to cypress:

ng add @cypress/schematic

Both will conveniently update the angular.js so that the commands ng lint and ng e2e are updated to use the new packages automatically. Though the old e2e folder and it’s test scripts will no longer be relevant, and you’ll need to rewrite the e2e test scripts in the cypress folder.