esbuild-plugin-cssm
v1.2.6
Published
Minimal css modules esbuild plugin
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esbuild-plugin-cssm
A minimal CSS Modules plugin for esbuild. Fork of esbuild-plugin-simple-css-modules by Katja Potensky. Like the original plugin, the only dependency is PostCSS (which itself has a small dependency graph).
Changes in this fork:
animation-name
supportid
attributes are scoped- Selectors containing multiple class names or ids are now properly transformed
- Clearer sourcemap paths
- Transformed selectors are suffixed with a hash of the filepath by default
Install
npm install --save-dev esbuild-plugin-cssm
Usage
- Setup
import { build } from 'esbuild';
import cssm from 'esbuild-plugin-cssm';
build({
// ... the rest of your config
plugins: [
cssm({
// Optional. Length of hash string that will be appended to CSS classes.
// Defaults to 6. Max-length of 28. Hashes are generated using SHA-1 internally.
hashLength: 6,
// Optional. A prefix to prepend to every generated selector.
prefix: '',
/**
* Optional. Define a custom selector transformer.
* This will be run on individual ids, classes, and animation names defined with @keyframes.
* Note: returned strings are automatically prefixed with '#' or '.' where applicable.
*
* @param {string} attr - The class, id, or animation name minus any prefixes (#, .)
* @param {PostCSS.Rule} node - A PostCSS Rule object for the complete selector
* @param {string} path - Path to the CSS Module
* @param {string} contents - A string containing the contents of the CSS Module
**/
transformSelector: (attr, node, path, content) => {
// contrived example
return 'myprefix' + node.selector + myCoolHasher(path);
}
})
]
});
- Define CSS in
.module.css
files
/* Home.module.css */
.blue {
color: blue;
}
#red {
color: red;
}
- Import the module
// Home.js
import { h } from 'preact';
import css from './Home.module.css';
export function Home() {
return <div>
<p className={css.blue}>
This text is blue
</p>
<p id={css['#red']}>
This text is red
</p>
</div>;
}
- esbuild will generate scoped CSS
/* bundle.css */
.blue_tL5t7T {
color: blue;
}
#red_tL5t7T {
color: red;
}