css-system/use-css

A react hook for building versatile design primitives. It follow the (theme ui specifications)[https://github.com/system-ui/theme-specification].

Example

import React, {createContext, useContext} from "react"
import ReactDOM from "react-dom"
import {useCss, ThemeContext} from "@css-system/use-css"

const theme = {
  breakpoints: {s: "40em", m: "52em", l: "64em"},
  colors: {
    background: "#ffffff",
    text: "#000000",
    primary: "#ff0000",
  },
  space: [0, 4, 8, 16, 32],
  fontSizes: [0, 12, 14, 16, 20, 24, 32, 48, 64, 72],
}

const View = ({as: Component = "div", css, ...props}) => {
  const className = useCss({
    display: "flex",
    minWidth: 0,
    minHeight: 0,
    flex: "none",
    alignItems: "stretch",
    flexDirection: "column",
    justifyContent: "flex-start",
    ...css,
  })

  return <Component className={className} {...props} />
}

const Text = ({as: Component = "span", css, ...props}) => {
  const className = useCss({
    display: "inline",
    minWidth: 0,
    minHeight: 0,
    flex: "none",
    ...css,
  })

  return <Component className={className} {...props} />
}

const App = () => {
  return (
    <ThemeContext.Provider value={theme}>
      <View
        css={{
          p: {_: 0, s: 1, m: 2, l: 3},
          "&:hover": {
            bg: "text",
            color: "background",
          },
        }}
      >
        <Text css={{fontSize: {_: 1, m: 2}}}>Hello world !</Text>
      </View>
    </ThemeContext.Provider>
  )
}