CSS Modules Still a Thing?

• proposal-import-attributes

  8 544 5.9 HTML

  Proposal for syntax to import ES modules with assertions

  

Yup, in vanilla that's fine, but I'm not sure whether bundlers etc are able to understand import assertions yet, as the spec is still being finalised - for example: the 'assert' keyword has now been officially changed to 'with', but only 'assert' is implemented anywhere at the moment.

• css-modules

  86 17,368 5.5

  Documentation about css-modules

  

So CSS modules are a form of 3rd-party CSS-in-JS, where what you import are the class names, which are then usually obfuscated etc at compile time, and all the actual style declarations are (usually) compiled into a single css file or tag as part of the bundling process. You can read the og docs on'em here, and you've probably seen'em used in React like:

import styles from "./styles.css";

function Example(){
    return (
        

            Hello
        
    );
}

They predate the ability to import non-js files in vanilla by a good while, and rely on the compile process to translate your .css files into .js files that can be imported using whichever loader you use in your bundler.

Import assertions are a vanilla way to import non-js files by telling the browser how to import them; assert { type: "css" } says to treat the file as CSS and create a CSSStyleSheet, assert { type: "json" } says to treat the file as JSON and create a JSON object - and hopefully assert { type: "html" } will hopefully arrive soon and create a #document-fragment or something similar.

Hope that clears it up!

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