Is there a way to resolve the warning message "The shadow-piercing descendant combinator (>>>) is deprecated" that appears when running ng build for production?

I keep receiving warnings when I run ng-build -c production for all my styles that contain the '>>>' notation.

Warning: ▲ [WARNING] Unexpected ">" /Users/mike/project2022/client/src/app/bank/bank-new/bank-new.component.ts-angular-inline--13.css:33:13: 33 │ :host >>> .nav-item > a {

INQUIRY - How can I resolve this issue?

For example, encountering warnings with the use of '>>>' during build processes

@Component({
  selector: 'app-bank-new',
  templateUrl: './bank-new.component.html',
  styleUrls: ['./bank-new.component.scss'],
  styles: [
    `
    :host >>> .nav-item > a {
      color: #17a2b8 !important;
    }
    :host >>> form-wizard > .card {
      border-radius: 0 !important;
      height: calc(100vh - 57px) !important;
      border: none !important;
    }
    :host >>> .card-footer {
      display: none !important;
    }
    `
  ]
})

htmlcssangulartypescript

Answer №1

https://angular.io/guide/component-styles#deprecated-deep--and-ng-deep :

The descendant combinator, known as (>>>), is no longer supported by major browsers and tools and has been deprecated. In response, Angular will be dropping support for all shadow-piercing selectors (/deep/, >>>, and ::ng-deep). It is recommended to use ::ng-deep for better compatibility with various tools until the removal takes place.

To ensure smoother functionality, it is advisable to replace or remove all instances of >>> selectors with non-shadow-piercing alternatives. Referencing the removal of support in major browsers can aid in identifying suitable alternatives.

Additionally, testing the viability of the ::ng-deep alternative without causing any warnings is encouraged.

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