Create consistent design-system-driven React UI components

Downloads in past


3.0.35 years ago6 years agoMinified + gzip package size for system-components in KB


DEPRECATED: This package has been renamed and moved to @rebass/components
Create consistent design-system-driven React UI components
Built with styled-system
sys, with support for styled-componentssc & emotionemotion
!Build Statusbuild-badgebuild
import system from 'system-components'

// creates a Box with default props tied to your theme
const Box = system({
  p: 2,
  bg: 'blue'

Or, to use with emotionemotion:
import system from 'system-components/emotion'


To create a styled-component with default props that hook into styled-systemsys props, pass a plain object as the first argument to the system function.
const Card = system({
  px: 2,
  py: 3,
  borderWidth: 1,
  borderColor: 'lightGray',
  borderRadius: 2

The system function will automatically apply styled-systemsys functions to the underlying styled-component based on the keys of the defaultProps object. System components also add prop type definitions and remove style props from the underlying HTML element.
See the styled-system docssys for a complete list of the available style functions.

Add style props without defaultProps

System components can also be created with styled-systemsys props without defining defaultProps.
const Box = system(

This allows for style props to be passed to the component instance:

Using custom functions

Custom style functions can be passed as an argument.
const Box = system(
  props => ({
    height: props.height

Changing the underlying HTML element

System components default to using a <div> as the HTML element. To change the HTML element use the is prop.
const Heading = system({
  is: 'h2',
  m: 0,
  fontSize: 6

Since is is a prop, it can also be passed to the element when used. This is useful for one-off changes to ensure semantic markup.
<Heading is='h1'>

Extending components

To extend another component, set it as the default is prop in your component definition, or pass it as a prop to the component instance.
const Text = system({
  fontSize: 2,

const Bold = system({
  is: Text,
  fontWeight: 'bold'

CSS prop

To add one-off custom CSS to any system-component, use the css prop.
<Heading css='opacity:0.75;'>

Using with other CSS-in-JS libraries

The base System class can be used to create a system-components function for any CSS-in-JS library.
import { System } from 'system-components'
import styled from 'nano-style'

const system = new System({
  createComponent: type => (...args) => styled(type)(...args)

export default system

MIT License