Package Exports

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (cxs) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

ϟ cxs

WIP

Functional CSS for functional UI components

cxs is a css-in-js solution to dynamically create stylesheets with a functional approach

Features

Avoids collisions with hashed classnames
Supports pseudo-classes without JS
Supports media queries without using window.matchMedia
Dedupes repeated styles
Automatically extracts common CSS declarations like display: block and float: left
Avoid maintaining and using custom syntax or classname DSLs from CSS frameworks and manually written CSS
Scoped styles with a component-based architecture
No separate CSS files to process or maintain

npm i cxs

Example Usage

// UI component example
import yo from 'yo-yo'
import cxs from 'cxs'

const Button = ({ text, onclick }) => {

  // Pass a style object to cxs, which returns a string for
  // adding hashed classnames to HTML.
  // Numbers are converted to px values.
  // Pseudo classes and @media queries work as well.
  // cxs attaches a stylesheet to the head and updates
  // rules with each call.
  const className = cxs({
    fontSize: 14,
    color: 'white',
    backgroundColor: '#07c',
    ':hover': {
      backgroundColor: '#06b'
    },
    '@media screen and (min-width:40em)': {
      fontSize: 18
    }
  })

  // Apply the classname to your component
  return yo`
    <button
      className=${className}
      onclick=${onclick}>
      ${text}
    </button>
  `
}

// For server-side rendering,
// get the CSS string after rendering a component tree
const body = view(state).toString()
const css = cxs.css

const html `<!DOCTYPE html>
<html>
  <head>
    <style>${css}</style>
  </head>
  <body>${body}</body>
</html>
`

API

// Returns a hashed className string and creates CSS rules for style objects
const className = cxs({ color: 'tomato' })

// Attach a style tag and CSSStyleSheet to the document
// This is useful for manually controlling style insertion
// when `options.autoAttach` is set to false.
cxs.attach()

// An array of cached CSS rules
const rules = cxs.rules

// A CSS string of cached rules. Useful for server-side rendering
const css = cxs.css

// Clears the rule cache. This can be used after building a DOM tree and attaching styles
cxs.clearCache()

// Options

// Disable automatic style insertion by setting `autoAttach` to false.
cxs.options.autoAttach = true

// Change the debounce time
cxs.options.debounce = 0

Vendor prefixes

cxs does not handle vendor prefixing to keep the module size at a minimum. To add vendor prefixes, use a prefixing module like inline-style-prefixer

import cxs from 'cxs'
import prefixer from 'inline-style-prefixer/static'

const prefixed = prefixer({
  display: 'flex'
})
const cx = cxs(prefixed)

Other CSS-in-JS options

Compared to other, similar modules, cxs is an attempt to create a smaller and simpler API and a smaller overall module. For more customizable and robust solutions, see the following:

Browser support

IE9 +
- Due to the following:
- CSSStyleSheet.insertRule()
- Array.filter
- Array.map
- Array.reduce
- Array.forEach

MIT License