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Discover how to make your `StencilJs` custom web components recognize global styles in your Angular application. Follow our step-by-step guide for a seamless integration!
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Resolving Global Styles for StencilJs Custom Web Components in Angular Apps

When developing modern web applications, you might want to leverage custom web components created with StencilJs. However, a common issue developers encounter is that these components fail to recognize global styles such as CSS variables once integrated into an Angular application. In this guide, we'll address this problem and provide a clear solution for making your StencilJs custom web component's styles accessible in Angular.

Understanding the Problem

To illustrate the issue, consider the scenario where you have developed a custom web component using StencilJs. You have defined several CSS variables in a global stylesheet located at /src/global/global.scss, which ideally should apply styling rules to your component.

Example of Global CSS Variables:

[[See Video to Reveal this Text or Code Snippet]]

When you compile your StencilJs component, it gets packaged, and you can publish it to NPM. Upon installing this component into an Angular app, you find that it appears functional but does not recognize any of the CSS variables defined in the global stylesheet. This lack of recognition is perplexing because the CSS file exists in the following path:

[[See Video to Reveal this Text or Code Snippet]]

The Cause of the Issue

The Angular application does not automatically include styles from node modules in the global context, which is why the CSS variables are not applied. You’ve rightly attempted to include the CSS file directly in your index.html like so:

[[See Video to Reveal this Text or Code Snippet]]

However, Angular's development server does not find this file due to the missing configuration to copy this CSS file to the intended path in the output directory.

Solution: Updating angular.json

The solution to ensure that your Angular application recognizes the global styles from your StencilJs component is relatively straightforward. You need to inform Angular to include the CSS from your custom component by modifying the angular.json configuration file.

Here’s How to do It:

Open the angular.json file in your Angular project root directory.

Locate the styles array under the build options.

Add the path to your component's CSS as shown below:

[[See Video to Reveal this Text or Code Snippet]]

Key Changes:

By adding the path of your StencilJs component's CSS file, Angular will now include these styles during the build process.

Make sure src/styles.scss is still included, allowing for your application's custom styles alongside the component styles.

Testing Your Configuration

After updating the angular.json file, follow the steps below to test your configuration:

Restart your Angular development server using:

[[See Video to Reveal this Text or Code Snippet]]

Check for any errors in the console and ensure that the application is running without issues.

Open your application in a browser and confirm that the styles defined in your StencilJs component are now recognized.

Conclusion

Integrating StencilJs custom web components into an Angular application can sometimes present challenges, especially regarding style recognition. However, by updating the angular.json configuration file to include the path to your component's CSS, you can seamlessly ensure that your global styles are applied.

With this solution, you can take full advantage of the styling capabilities offered by StencilJs, allowing for a more cohesive design across your application. Happy coding!