The boilerplate for using ngUpgrade Lite can be generated with Nx as an so called AngularJS Downgrade Module. For this, I've created a new Angular Project with the CLI using ng new ... and after switching to its folder I've used the following commands:

npm i @types/angular --save-dev
npm i @angular/upgrade --save
npm i @nrwl/schematics --save-dev

ng generate downgrade-module legacyApp --collection @nrwl/schematics 

This post shows how to use the AOT-aware NgUpgrade "classic".

Other than the "classic" version, the lite version does not automatically trigger the AngularJS 1.x change detection b/c it turned out that this can lead to hybrid apps with bad performance. Instead of this we have to trigger it by ourselves.

Also, we have to bootstrap AngularJS 1.x first and to reference the downgraded Angular (2+) main module. Moreover, When downgrading an Angular (2+) component we have to set propagateDigest to false:

const dgSubModule = angular
  .module('sub', [])
  .directive('appSub', downgradeComponent({ component: SubComponent, propagateDigest: false }))
  .factory('subService', downgradeInjectable(SubService));

const downgraded = angular
  .module('downgraded', [downgradeModule(bootstrapAngular), dgSubModule.name])
  .directive('appRoot', downgradeComponent({ component: AppComponent, propagateDigest: false }));

angular.bootstrap(document, ['phonecatApp', downgraded.name]);

More Infos can be found in the Nx documentation and in the current repo (e. g. see src/app/main.ts for bootstrapping or src/app/sub/sub.component.ts for triggering the $digest).

This sample was created with Angular 5.x and at this time ngUpgrade Lite was marked as "experimental".