In Angular version 12, the type of ActivatedRouteSnapshot.fragment is nullable. This migration automatically adds non-null assertions to it.

Lazy loading syntax migration. Update lazy loading string syntax to use dynamic imports.

Remove deprecated ViewEngine-based i18n build and extract options. Options present in the configuration will be converted to use non-deprecated options.

Remove 'emitDecoratorMetadata' TypeScript compiler option. Decorator metadata is no longer needed by Angular. Read more about this here: https://www.typescriptlang.org/docs/handbook/decorators.html#metadata

Remove deprecated options from 'angular.json' that are no longer present in v12.

Updates Web Worker consumer usage to use the new syntax supported directly by Webpack 5.

Update 'zone.js' to version 0.11.x. Read more about this here: https://github.com/angular/angular/blob/master/packages/zone.js/CHANGELOG.md#breaking-changes-since-zonejs-v0111

`XhrFactory` has been moved from `@angular/common/http` to `@angular/common`.

Remove invalid 'skipTests' option in '@schematics/angular:module' Angular schematic options.

Automatically migrates shadow-piercing selector from `/deep/` to the recommanded alternative `::ng-deep`.

Replace the deprecated '--prod' in package.json scripts.