When Angular encounters :host-context([dir=rtl]) .ion-float-start, it raises a warning about an unmatched pseudo-class in the context of multiple projects within a single angular.json file

I am currently working on an Angular Project that is being used for two different web apps with separate backends. The frontend remains the same for both projects. However, after adding the second project to the angular.json file, I started receiving some warnings:

Warning: 10 rules skipped due to selector errors:
  :host-context([dir=rtl]) .ion-float-start -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-end -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-sm-start -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-sm-end -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-md-start -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-md-end -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-lg-start -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-lg-end -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-xl-start -> unmatched pseudo-class :host-context
  :host-context([dir=rtl]) .ion-float-xl-end -> unmatched pseudo-class :host-context

The second project only differs in terms of some scss files and the environment.ts file. I am unsure about the meaning and origin of these warnings. I did a search online but was unable to find any solutions. Does anyone have any insights on how to resolve this issue?

All software versions including Angular, Ionic, and Node are up to date.

Update: It appears that Ionic may be the cause of these warnings. https://github.com/ionic-team/ionic-framework/issues/23298#issuecomment-840598080 I believe this warning can be safely ignored.

jsonangulartypescriptionic-framework

Answer №1

This new feature called Inline critical CSS was recently implemented in Angular 11.1 as an optimization technique. Initially, it was turned off by default, but with the release of version 12, it became enabled automatically.

Once activated, Angular goes through a specific process during the building phase:

  1. The framework identifies and isolates all crucial CSS resources required for immediate rendering (referred to as critical CSS).

  2. After extracting this critical CSS content, Angular directly injects it into the index.html file.

To sum up, this enhancement allows Angular to embed the essential CSS code directly into the index.html file, thereby improving the loading speed and overall performance of the application.

If needed, you have the option to disable this feature by setting inlineCritical to false in the angular.json configuration file.

"build": { "options": { "optimization": { "styles": { "inlineCritical": false } } } }

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