There are lots of ways to use Emotion, if you’re using React, the easiest way to get started is to use the @emotion/react package. If you’re not using React, you should use the emotion package.

yarn add @emotion/react

or if you prefer npm

npm install --save @emotion/react

To use it, import what you need, for example use the css prop to create class names with styles.

// this comment tells babel to convert jsx to calls to a function called jsx instead of React.createElement
/** @jsx jsx */
import { jsx, css } from '@emotion/react'

const style = css`
  color: hotpink;
`

const SomeComponent = ({ children }) => (
  <div css={style}>
    Some hotpink text.
    {children}
  </div>
)

const anotherStyle = css({
  textDecoration: 'underline'
})

const AnotherComponent = () => (
  <div css={anotherStyle}>Some text with an underline.</div>
)
render(
  <SomeComponent>
    <AnotherComponent />
  </SomeComponent>
)

With styled

styled is a way to create React components that have styles attached to them.

# assuming you already have @emotion/react installed
yarn add @emotion/styled

or if you prefer npm

npm install --save @emotion/styled

import styled from '@emotion/styled'

const Button = styled.button`
  color: hotpink;
`

render(<Button>This is a hotpink button.</Button>)

With @emotion/babel-plugin

Note:

If you’re using Create React App, you can use the Babel macro

Emotion has an optional Babel plugin that optimizes styles by compressing and hoisting them and creates a better developer experience with source maps and labels.

yarn add --dev @emotion/babel-plugin

or if you prefer npm

npm install --save-dev @emotion/babel-plugin

.babelrc

"emotion" must be the first plugin in your babel config plugins list.

{
  "plugins": ["@emotion"]
}

If you are using Babel’s env option emotion must also be first for each environment.

{
  "env": {
    "production": {
      "plugins": ["@emotion", ...otherBabelPlugins]
    }
  },
  "plugins": ["@emotion"]
}

Vanilla

If you’re not using React, you can use vanilla Emotion from the @emotion/css package. Most of the documentation here focuses on the React-specific version of Emotion, but most of the concepts in the React-specific version also apply to vanilla Emotion.

yarn add @emotion/css

import { css } from '@emotion/css'

const app = document.getElementById('root')
const myClassName = css`
  color: hotpink;
`
app.classList.add(myClassName)