@cssfn/cssfn NPM

cssfn - Writes CSS in JavaScript way

A lib for generating Style Sheet (css) with JavaScript function.
Similar to React Hooks but for generating css dynamically.

By underlying JavaScript language, the css can be easily exported/imported as a regular JavaScript module.

The generated css can be exported to css toString() or attached to DOM directly .attach().

Preview

export const usesAwesomeButton = () => composition([
    imports([
        stripoutControl(), // clear browser's default styles
        
        usesButtonBase(), // imports css from a generic button
        
        // imports any stuff here...
    ]),
    layout({
        display       : 'flex',
        flexDirection : 'row',
        background    : 'pink',
        color         : 'darkred',
        
        // writes the css declaration similar to regular css
        
        ...children(['span', '.logo'], [ // target to <span> and class="logo"
            imports([
                // imports any stuff here...
            ]),
            layout({
                // writes the css declaration similar to regular css
            }),
        ]),
    }),
    variants([
        rule('.big', [
            layout({
                fontSize: 'xx-large',
                // ....
            }),
        ]),
        rule('.dark', [
            // ...
        ]),
    ]),
    states([
        rule([':disabled', '.disabled'], [
            // ....
        ]),
    ]),
]);

// attach the css to DOM:
createSheet(() => [
    globalDef([
        rule('.awesome-btn', [
            imports([
                usesAwesomeButton(),
            ]),
        ]),
        rule('.awesome-checkbox', [
            // ....
        ]),
        // ....
    ]),
])
.attach();

Then we can consume our generated css like this:

<script src="button-style.js">
</script>

<button class="awesome-btn">Awesome!</button>

Features

Includes all Vanilla & ES6 JavaScript features.
Lazy execution (your function will be executed on demand).
Cached - your function only be executed once (or never if not needed).
IntelliSense supported - Our cssfn is written in TypeScript (superset of JavaScript).
CSS Variable Management - Never write variable name in plain string.
CSS Config Management - Shares a common setting to many components.