Styled 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.

Styled

These are available from preact/styled (technically, it’s provided by the onejs-preact package, but the shortcut mappings in tsconfig.json allows you to just use preact/styled).


import { h, render } from "preact"
import styled, { CompType, uss } from "preact/styled"
 
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 }, JSX.Button>
 
render(<Button text="Hello!" primary />, document.body)

attr also works as you’d expect:


import styled from "preact/styled"
import { h, render } from "preact"
 
const Jin = styled.button.attrs(props => ({
    text: props.foo
}))`
    color: red;
`
 
const Cup = styled(Jin).attrs(props => ({
    text: "Foooooo",
    bar: props.bar || 50
}))`
    font-size: ${props => props.bar}px;
`
 
render(<Cup foo="My Text" />, document.body)

Emotion

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


import { emo } from "onejs"
import { h, render } from "preact"
 
const Foo = (props) => {
    return <div class={emo`
        font-size: ${props.size ?? 10}px;
        color: red;
    `}>Hello</div>
}
 
render(<Foo size={30} />, document.body)

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