Importing external stylesheets globally with CSS modules - sass

Question

I'm struggling to add SASS with an external stylesheet (Bulma) to my React application. So far I have set up Parcel with CSS modules via postcss. This is my .postcssrc config:
{
"modules": true,
"plugins": {
"autoprefixer": {
"grid": true
},
"postcss-modules": {
"generateScopedName": "[name]_[local]_[hash:base64:5]"
}
}
}
I have installed node-sass and successfully added a .scss file to one of my components. External (Bulma) styles are added via #import "~bulma/bulma"; and are correctly resolved.
Unfortunately, imported styles are not applied globally and instead the class names are modified similarly to local definitions, e.g.:
/*! bulma.io v0.8.0 | MIT License | github.com/jgthms/bulma */
#-webkit-keyframes container_spinAround_28_Bz {
from {
transform: rotate(0deg); }
to {
transform: rotate(359deg); } }
#keyframes container_spinAround_28_Bz {
from {
transform: rotate(0deg); }
to {
transform: rotate(359deg); } }
Note the added prefixes and suffixes.
Ideally, I would like to import the stylesheet globally and do not modify their names. I'd like to continue using CSS modules and I think I also have to use SASS in order to globally modify Bulma stylesheet by overriding SASS variables.
Anyway, things I've tried so far:
Using postcss-nested and wrapping the import with :global block:
:global {
#import "~bulma/bulma";
}
However, this throws an exception:
main.scss:5018:5: Missing whitespace before :global
Creating a separate scss file included directly in HTML file via <link> rather than imported in a jsx/tsx file to avoid using CSS modules.
This seems to break Parcel entirely, as it fails to link correct files in the compiled HTML files, i.e. <LONG-HASH>.css instead of generated main.<HASH>.css.
Using postcss-import.
Either my setup is incorrect or it has no effect on SASS files.

Answer 1

You can define regular expressions to mark matched files as global stylesheets with the globalModulePaths setting.
"postcss-modules": {
"globalModulePaths": [
".*\\.global\\..*"
]
}
The example above would mark all files with .global. in their name, e.g. main.global.css.
Managed to figure it out while writing the question.

Answer 2

The only solution that worked for me to load global CSS styles from rollup (when applying preserveModules: true) was using the 'rollup-plugin-styles' plugin and the following configuration:
// rollup.config.js
plugins: [
styles({
extensions: ['.css'],
use: ['css'],
}), …
]
// In the package.json you have to add the proper side effects
{
"sideEffects": [
"**/*.css",
"**/*.css.js" //this one is very important too
],
}
// MyComponent.tx
import '../styles/myGlobal.css';