romannurik / css-esm

CSS modules in the browser, with lightweight preprocessing

css-esm

CSS modules in the browser, with lightweight preprocessing by stylis.js

Based on the quite awesome csz library by Luke Jackson.

Usage

With inline styles:

import {css} from 'https://unpkg.com/css-esm';

const styles = css`
  .button {
    color: red;
  }

  :global (.foo) {
    .button.is-primary {
      color: green;
    }
  }
`;

document.body.innerHTML = `
  <button class="${styles.button}">Get started</button>
  <div class="foo">
    <button class="${styles.button} ${styles.isPrimary}">Another button</button>
  </div>
`;

With external files:

import {loadCss} from 'https://unpkg.com/css-esm';
const styles = loadCss('main.css');

document.body.innerHTML = `
  <button class="${styles.button}">Get started</button>
`;

While mapped class names are available immediately, you can see when the CSS file has loaded using the special $loaded property (a Promise):

const styles = loadCss('main.css');
await styles.$loaded;