$ npm install theme-ui
The Design Graph Framework
Theme UI is a library for creating themeable user interfaces based on constraint-based design principles. Build custom component libraries, design systems, web applications, Gatsby themes, and more with a flexible API for best-in-class developer ergonomics.
stable docs: https://theme-ui.com
develop (v0.6.0-alpha) docs: https://dev.theme-ui.com
Built for design systems, white-labels, themes, and other applications where customizing colors, typography, and layout are treated as first-class citizens and based on a standard Theme Specification, Theme UI is intended to work in a variety of applications, libraries, and other UI components. Colors, typography, and layout styles derived from customizable theme-based design scales help you build UI rooted in constraint-based design principles.
sx
propnpm install theme-ui
Any styles in your app can reference values from the global theme
object.
To provide the theme in context,
wrap your application with the ThemeProvider
component and pass in a custom theme
object.
// basic usage
import { ThemeProvider } from 'theme-ui'
import theme from './theme'
export default (props) => (
<ThemeProvider theme={theme}>{props.children}</ThemeProvider>
)
The theme
object follows the System UI Theme Specification,
which lets you define custom color palettes, typographic scales, fonts, and more.
Read more about theming.
// example theme.js
export default {
fonts: {
body:
'system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif',
heading: '"Avenir Next", sans-serif',
monospace: 'Menlo, monospace',
},
colors: {
text: '#000',
background: '#fff',
primary: '#33e',
},
}
sx
propThe sx
prop works similarly to Emotion's css
prop, accepting style objects to add CSS directly to an element in JSX, but includes extra theme-aware functionality.
Using the sx
prop for styles means that certain properties can reference values defined in your theme
object.
This is intended to make keeping styles consistent throughout your app the easy thing to do.
The sx
prop only works in modules that have defined a custom pragma at the top of the file, which replaces the default React JSX functions.
This means you can control which modules in your application opt into this feature without the need for a Babel plugin or additional configuration.
/** @jsxImportSource theme-ui */
export default (props) => (
<div
sx={{
fontWeight: 'bold',
fontSize: 4, // picks up value from `theme.fontSizes[4]`
color: 'primary', // picks up value from `theme.colors.primary`
}}>
Hello
</div>
)
Read more about how the custom pragma works.
The sx
prop also supports using arrays as values to change properties responsively with a mobile-first approach.
This API originated in Styled System and is intended as a terser syntax for applying responsive styles across a singular dimension.
/** @jsxImportSource theme-ui */
export default (props) => (
<div
sx={{
// applies width 100% to all viewport widths,
// width 50% above the first breakpoint,
// and 25% above the next breakpoint
width: ['100%', '50%', '25%'],
}}
/>
)
MIT License
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