Generate angular workspace/application with ChangeDetection onPush

[prabh-62]

🚀 Feature request

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• extract-i18n
• run
• config
• help
• version
• doc

Description

User should be able to generate angular applications/libraries with change detection enabled.

• npx @angular/cli@12 new web-apps --create-application false --changeDetection onPush

Unknown option: '--changeDetection'
Unknown option: 'onPush'

Describe the solution you'd like

Provide a flag to enable change detection

Describe alternatives you've considered

Manually edit

• angular.json and append "changeDetection": "OnPush" under @schematics/angular:component for every workspace application/library
• projects/<app>/src/app/app.component.ts and append changeDetection: ChangeDetectionStrategy.OnPush to @Component decorator

[alan-agius4]

This did come up when we discussed #21278.

We feel that this is trivial enough to do and doesn't warrant to be included as an extra option in the various schematics. The fact that this option in the application schematic is already ambiguous enough.

Remember that you can use the ng config command to set up the options.

ng new web-apps --no-create-application
ng config schematics.@schematics/angular:component.changeDetection OnPush
ng generate application app-one

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