Is not core-js needed anymore?

Question

I've updated an Angular project from version 7 to 8. Everything runs smoothly, schematics did it's job (maybe) and we are Ok (project is even in production). When we're updating Angular CLI, we always generate a new project to see the real differences and learn from them such as new dependencies, configurations, etc.

When generating a new Angular project with Angular CLI 8.0.4, the new app doesn't have core-js as dependency:

"dependencies": {     "@angular/animations": "~8.0.1",     "@angular/common": "~8.0.1",     "@angular/compiler": "~8.0.1",     "@angular/core": "~8.0.1",     "@angular/forms": "~8.0.1",     "@angular/platform-browser": "~8.0.1",     "@angular/platform-browser-dynamic": "~8.0.1",     "@angular/router": "~8.0.1",     "rxjs": "~6.4.0",     "tslib": "^1.9.0",     "zone.js": "~0.9.1"   } 

Analyzing bundle on built project core-js is not there: On my older project, updated with Angular CLI, core-js is there and is present in the final bundle:

"dependencies": {     "@angular/animations": "~8.0.3",     "@angular/cdk": "~8.0.1",     "@angular/common": "~8.0.3",     "@angular/compiler": "~8.0.3",     "@angular/core": "~8.0.3",     "@angular/forms": "~8.0.3",     "@angular/platform-browser": "~8.0.3",     "@angular/platform-browser-dynamic": "~8.0.3",     "@angular/router": "~8.0.3",     "@auth0/angular-jwt": "2.1.1",     "@hackages/ngxerrors": "~8.0.0",     "@ng-bootstrap/ng-bootstrap": "5.0.0-rc.1",     "@ngx-loading-bar/core": "~4.2.0",     "@ngx-loading-bar/http-client": "~4.2.0",     "@nicky-lenaers/ngx-scroll-to": "~2.0.0",     "@swimlane/ngx-charts": "~12.0.1",     "bootstrap": "~4.3.1",     "core-js": "~2.6.9",     "d3-scale": "~3.0.0",     "d3-shape": "~1.3.5",     "date-fns": "2.0.0-beta.2",     "ngx-perfect-scrollbar": "~8.0.0",     "ngx-toastr": "~10.0.4",     "rxjs": "~6.5.2",     "tslib": "~1.10.0",     "xlsx": "~0.14.3",     "zone.js": "~0.9.1"   } 

Why is this behavior? Is it safe to remove core-js as dependency? Does update schematics missing this? When installing npm dependencies on the newest project I get the post-install messages from core-js, but it is not explicitly present in package description.

Answer 1

According to this article.

Note that core-js has been updated to v3, and is now directly handled by the CLI itself, so it’s no longer needed as a dependency of your application.