If you are a front-end or a fullstack developer, you maybe already imported CSS files from a Javascript or a Typescript file. For instance: import styles from "./styles.css" A few months ago it would not have been possible out of the shelf. Indeed you would need a bundler (such as WebPack, Rollup,…) to “inline” the CSS file as a string in your Javascript file. Nowadays it’s possible thanks to the “CSS Modules” (to not confuse with the homonym open-source project).