Using styled-components in React/Next Applications

Introduction

When it comes to styling your React application with a css-in-js approach, styled-components stands out as a top choice. In this post, I'll walk you through how to utilize styled-components in a Next application. By default, Next provides a way to use css-in-js through styled-jsx. However, if you find styled-jsx cumbersome because it requires writing CSS within JSX, which can make your components lengthier, then styled-components might be the right fit for you.

Installation of styled-components

npm install styled-components
// or
yarn add styled-components


Example usage:

import styled from 'styled-components'

const Wrapper = styled.div`
color: red;
text-align: center;
`

// Component with input param
const Wrapper2 = styled.div<{$color?: string}>`
color: ${props => props.$color};
text-align: center;
`

export default function Index() {
return (
<>
<Wrapper>Demo 1</Wrapper>
<Wrapper2 $color="green">Demo 2</Wrapper2>
</>
)
}


Adding Theme Settings

Here's how to use the ThemeProvider to import a theme for your entire application that can be accessed anywhere, similar to using React context.

import {useContext, useMemo} from 'react'
import styled, {ThemeContext, ThemeProvider} from 'styled-components'

const Wrapper = styled.div`
color: red;
text-align: center;
`

const Wrappe2 = (color: string) => styled.div`
color: ${color};
text-align: center;
`

const theme = {
colors: {
primary: '#0070f3',
},
}

function Display() {
const themeContext = useContext(ThemeContext) // get theme context
console.log('themeContext', themeContext)
return (
<>
<Wrapper>Demo 1</Wrapper>
<Wrapper2 $color={themeContext?.colors.primary}>Demo 2</Wrapper2>
</>
)
}

export default function Index() {
return (
<ThemeProvider theme={theme}>
<Display />
</ThemeProvider>
)
}


Using in the Next Application

If you want to use it in a Next application, simply add the following code snippet to the app/layout.tsx file to set up the layout for all pages.

export default function Index({children}: {children: JSX.Element}) {
return <ThemeProvider theme={theme}>{children}</ThemeProvider>
}


Afterwards, in each page, you can retrieve the theme context as follows:

'use client'

import {useContext, useMemo} from 'react'
import styled, {ThemeContext, ThemeProvider} from 'styled-components'

export default function Index() {
const themeContext = useContext(ThemeContext) // get theme context
return (
<>
<Wrapper>Demo 1</Wrapper>
<Wrapper2 $color={themeContext?.colors.primary}>Demo 2</Wrapper2>
</>
)
}


Conclusion

So, we have successfully set up styled-components in React/Next, providing some examples of usage and how to configure using ThemeProvider. Hopefully, this article proves to be helpful.

Don't hesitate to leave your thoughts in the comments section, and remember to like, share, and follow for more insightful content in the future!

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