App.css is not added to editor when 'yarn dev' is runnig

[Kit]

I’ve managed to load app.css into the editor base on this post:

How to use compiled css within add_editor_style();

Hello, I’m using the classic editor, and I’d like to use the compiled editor.css to reflect the styling on the front end. The issue I have is passing the compiled asset into add_editor_style() I’ve added the following to setup.php, but it doesn’t work. add_action( 'admin_init', function () { add_editor_style( \Roots\asset('editor') ); }); The only way I can get it to work is to add the full path, but that obviously stops working each time I rebuild the assets. add_action( 'admin_init', fu…

The style is applied to both editor and front-end after I run yarn build. However, when I run yarn dev, the style is only applied to front-end until I run yarn build again. Presumably, it’s a issue related to how the hot-reload script injects the CSS?

Is there a way to apply the css when I am running yarn dev?

Other than enabling FSE, the following is the only piece of code added to setup.php

add_action('after_setup_theme', function () {
    add_theme_support('editor-styles');
    $relAppCssPath = asset('app.css')->relativePath(get_theme_file_path());
    add_editor_style($relAppCssPath);
});

app.css I used for testing

* {
  @apply border border-red-500;
}