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styled-jsx
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Giuseppe Gurgone
December 13, 2017
Programming
5
2.8k
styled-jsx
A CSS in JS library inspire by ShadowDOM.
https://github.com/zeit/styled-jsx
Giuseppe Gurgone
December 13, 2017
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Transcript
styled-jsx
CSS in JS library for React inspired by ShadowDOM
zeit/styled-jsx
Guillermo Rauch Naoyuki Kanezawa Giuseppe Gurgone
Guillermo Rauch Naoyuki Kanezawa Giuseppe Gurgone
styled-jsx
CSS in HTML
<style> .container { background: black } h1 { color: white
} </style>
CSS in JSX
<style>{` .container { background: black } h1 { color: white
} `}</style>
<style>{` .container { background: black } h1 { color: white
} `}</style>
CSS in styled-jsx
<style jsx>{` .container { background: black } h1 { color:
white } `}</style>
<style jsx>{` .container { background: black } h1 { color:
white } `}</style>
Rendered inside a JSX element
<div className=’container’> <h1>Zeit rocks</h1> <style jsx>{` .container { background: black
} h1 { color: white } `}</style> </div>
<div className=’container’> <h1>Zeit rocks</h1> <style jsx>{` .container { background: black
} h1 { color: white } `}</style> </div>
Styles encapsulation Controlled Cascade Full CSS support
Simplicity and DX
<div className=’container’> <h1>Zeit rocks</h1> <style jsx>{` .container { background: black
} h1 { color: white } `}</style> </div>
Zero learning curve
How?
Rewrite JSX with a Babel plugin
npm i --save styled-jsx
{ “plugins“: [ “styled-jsx/babel“ ] }
<div className=’container’> <h1>Zeit rocks</h1> <style jsx>{` .container { background: black
} h1 { color: white } `}</style> </div>
becomes
import _JSXStyle from ’styled-jsx/style’ <div className=’jsx-123 container’> <h1 className=’jsx-123’>Zeit rocks</h1>
<_JSXStyle styleId={’123’} css={` .container.jsx-123 { background: black } h1.jsx-123 { color: white } `} /> </div>
import _JSXStyle from ’styled-jsx/style’ <div className=’jsx-123 container’> <h1 className=’jsx-123’>Zeit rocks</h1>
<_JSXStyle styleId={’123’} css={` .container.jsx-123 { background: black } h1.jsx-123 { color: white } `} /> </div>
Compile time transformation, Babel and Stylis Server Side Rendering out
of the box High-performace CSS injection at runtime Critical CSS and style tags deduping
Built-in CSS vendor prefixing Source maps Prettier
just by adding a single jsx attribute
<style jsx>{` .container { background: black } h1 { color:
white } `}</style>
Simplicity
Advanced features
Global styles
<style jsx global>{` .container { background: black } h1 {
color: white } `}</style>
One-off global selectors with :global()
.container > :global(h1)
.container.jsx-123 > h1
Dynamic styles and themes
(props) => <h1> {props.children} <style jsx>{` h1 { color: ${props.color}
} `}</style> </h1>
External CSS.js modules
import css from ‘styled-jsx/css’ export default css` h1 { color:
white } `
import styles from ‘./styles’ <style jsx>{styles}</style>
import styles from ‘./styles’ <style jsx global>{styles}</style>
css works in the same file
const styles = css` h1 { color: white } `
<style jsx>{styles}</style>
CSS preprocessing via plugins
(css: string, settings: Object) => string
Trade-offs
Strings not as powerful as Object Literals
Interpolations not preprocessed or scoped
Styling Shadow DOM from the outside world is tricky
:global() makes it easier but it is not perfect
const scoped = resolveScopedStyles( <scope> <style jsx>{` .link { font-weight:
bold } `}</style> </scope> ) export default () => <h1> <Link className={scoped.classes(‘link’)}> Zeit </Link> rocks <scoped.Styles /> </h1>
const scoped = resolveScopedStyles( <scope> <style jsx>{` .link { font-weight:
bold } `}</style> </scope> ) export default () => <h1> <Link className={scoped.classes(‘link’)}> Zeit </Link> rocks <scoped.Styles /> </h1>
function resolveScopedStyles(scope) { return { className: scope.props.className, Styles: () =>
scope.props.children, classes: (className) => scope.props.className + ‘ ‘ + className } } // © Anton Ignatov
Function resolveScopedStyles(scope) { return { className: scope.props.className, Styles: () =>
scope.props.children, classes: (className) => scope.props.className + ‘ ‘ + className } } // © Anton Ignatov
<Link className="link"> Zeit <style jsx>{` .link { font-weight: bold }
} `}</style> </Link>
Styling third parties components
styled-jsx/css produces scoped and global CSS for now
Recap
Add a jsx attribute to a style element
Rendered inside a JSX element
Profit
Simplicity
It is just CSS
encapsulated
“if the poo is trapped in a box then it
only smells when you open it.” – @danwrong, on software modularization.
@giuseppegurgone
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