glamor

css in your javascript

npm install glamor --save

usage

import { css } from 'glamor'

// make css rules 
let rule = css({ 
  color: 'red',
  ':hover': {
    color: 'pink'
  },
  '@media(min-width: 300px)': {
    color: 'green',
    ':hover': {
      color: 'yellow'
    }
  }
})

// add as data attributes
<div {...rule} {...another}>
  zomg
</div>

// or as classes 
<div className={`${rule} ${another}`}>
  zomg
</div>

// merge rules for great justice 
let mono = css({
  fontFamily: 'monospace'
})

let bolder = css({
  fontWeight: 'bolder'
})

<div {...css(mono, bolder)}>
  bold code!
</div>

motivation

This expands on ideas from @vjeux's 2014 css-in-js talk. We introduce an api to annotate arbitrary dom nodes with style definitions ("rules") for, um, the greater good.

features

fast / efficient, with a fluent api
~8k gz, including the prefixer
framework independent
adds vendor prefixes / fallback values
supports all the pseudo :classes/::elements
@media queries
@supports statements
@font-face / @keyframes
escape hatches for parent / child / contextual selectors
dev helper to simulate pseudo classes like :hover, etc
server side / static rendering
tests / coverage
experimental - write real css, with syntax highlighting and linting

(thanks to BrowserStack for providing the infrastructure that allows us to run our build in real browsers.)

docs

api documentation
howto - a comparison of css techniques in glamor
plugins
server side rendering
performance tips
what happens when I call css(...rules)?

extras

glamor/reset - include a css reset
use a css prop on all your react elements
glamor/react - helpers for themes, @vars
glamor/jsxstyle - react integration, à la jsxstyle
glamor/aphrodite - shim for aphrodite stylesheets
glamor/utils - a port of postcss-utilities
glamor/ous - a port of the skeleton css framework
glamor/styled - an experimental port of styled-components

speedy mode

there are two methods by which the library adds styles to the document -

by appending css 'rules' to a browser backed stylesheet. This is really fast, but has the disadvantage of making the styles uneditable in the devtools sidebar.
by appending text nodes to a style tag. This is fairly slow, but doesn't have the editing drawback.

as a compromise, we enable the former 'speedy' mode NODE_ENV=production, and disable it otherwise. You can manually toggle this with the speedy() function.

characteristics

while glamor shares most common attributes of other inline style / css-in-js systems, here are some key differences -

uses 'real' stylesheets, so you can use all css features.
rules can be used as data-attributes or classNames.
simulate pseudo-classes with the simulate helper. very useful, especially when combined when hot-loading and/or editing directly in devtools.
really fast, by way of deduping rules, and using insertRule in production.

todo

redo all the docs
planned enhancements
notes on composition
ie8 compat

profit, profit

I get it

jozanza/glamor