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Styled Components and Emotion

OneJS provides APIs that are equivalent to the styled, css, and attr APIs from Styled Components, and also the css API from Emotion.

These are available from onejs/styled:

import styled, { CompType, uss } from "onejs/styled"
import { h, render } from "preact"

const Button = styled.button`
    border-width: 0;
    border-radius: 3px;
    background-color: green;
    color: white;
    &:hover {
        background-color: red;

    ${props => props.primary && uss`
        background-color: white;
        color: black;
` as CompType<{ primary: boolean }, h.JSX.Button>

render(<Button text="Hello!" primary />, document.body)

attr also works as you'd expect:

import styled from "onejs/styled"
import { h, render } from "preact"

const Jin = styled.button.attrs(props => ({
    color: red;

const Cup = styled(Jin).attrs(props => ({
    text: "Foooooo",
    bar: || 50
    font-size: ${props =>}px;

render(<Cup foo="My Text" />, document.body)

Emotion's css (which is different from Styled Components' css) is available as emo from onejs/styled:

import { emo } from "onejs/styled"
import { h, render } from "preact"

const Foo = (props) => {
    return <div class={emo`
        font-size: ${props.size ?? 10}px;
        color: red;

render(<Foo size={30} />, document.body)

Please get in our Discord to share what other APIs you'd like to see supported.