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How to Use Styled-Components In Next.js?

9 minutes read

Styled-components is a popular library for styling React components with JavaScript code. It allows you to write CSS in your JavaScript files using a special syntax called "CSS-in-JS". To use styled-components in a Next.js project, you first need to install it by running the command "npm install styled-components" or "yarn add styled-components" in your terminal.


Next, you can create styled components by importing the "styled" function from the styled-components library and using it to define styles for your components. For example, you can create a styled button component by writing:


const Button = styled.buttonbackground-color: blue; color: white; padding: 10px 20px; border: none;;


You can then use this Button component like any other React component in your Next.js project.


One advantage of using styled-components in Next.js is that it allows you to create encapsulated styles for your components, making it easier to manage and maintain your styling code. Additionally, styled-components can be used with server-side rendering in Next.js, which can help improve performance and SEO for your application.

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How to style third-party components in Next.js using styled-components?

To style third-party components in Next.js using styled-components, follow these steps:

  1. Install styled-components package:
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npm install styled-components


  1. Create a new file called _app.js in the pages directory if it does not already exist.
  2. Import createGlobalStyle and ThemeProvider from styled-components in the _app.js file. 
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import { createGlobalStyle, ThemeProvider } from "styled-components";


  1. Create a global styles component using createGlobalStyle and define your styles inside it. For example:
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const GlobalStyle = createGlobalStyle`
  body {
    font-family: 'Arial', sans-serif;
    background-color: #f0f0f0;
  }
`;


  1. Wrap the entire app inside the ThemeProvider component to provide the global styles and any other custom theme variables that you want to use.
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const MyApp = ({ Component, pageProps }) => {
  return (
    <ThemeProvider theme={theme}>
      <GlobalStyle />
      <Component {...pageProps} />
    </ThemeProvider>
  );
};


  1. Define any custom theme variables that you want to use in the ThemeProvider component. For example:
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const theme = {
  primaryColor: "blue",
  secondaryColor: "green"
};


  1. Now you can style third-party components in your Next.js application using styled-components. Simply import the styled-components and use them to style the components. For example:
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import styled from "styled-components";

const StyledButton = styled.button`
  background-color: ${props => props.theme.primaryColor};
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
`;

const ThirdPartyComponent = () => {
  return (
    <StyledButton>Click me</StyledButton>
  );
};

export default ThirdPartyComponent;


Now your third-party components will be styled according to the styles defined in the global styles and custom theme variables using styled-components in Next.js.


How to avoid style collisions in Next.js with styled-components?

One way to avoid style collisions in Next.js with styled-components is by implementing a naming convention for your styled components. This means giving each styled component a unique and descriptive name that reflects its purpose in the application.


Additionally, you can use the CSS Modules feature in Next.js to generate unique classNames for your styled components. This will scope the styles to only apply to the specific component they are intended for, preventing any collisions with styles from other components.


Lastly, you can also explicitly target your styled components using the "styled" function's displayName property to ensure that they are rendered with a unique className in the final output. This can help prevent any accidental style overrides or collisions.


By following these best practices, you can effectively avoid style collisions in Next.js with styled-components and ensure a consistent and maintainable styling solution for your application.


How to use TypeScript with styled-components in Next.js?

To use TypeScript with styled-components in Next.js, you can follow these steps:

  1. Install necessary dependencies:
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npm install styled-components @types/styled-components


  1. Create a tsconfig.json file in the root of your project with the following configuration:
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{
  "compilerOptions": {
    "target": "esnext",
    "module": "esnext",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "strict": false,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true
  },
  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
  "exclude": ["node_modules"]
}


  1. Create a global.d.ts file in the root of your project with the following content:
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import * as styledComponents from 'styled-components';

declare module 'styled-components' {
  export interface DefaultTheme {
    colors: {
      primary: string;
      secondary: string;
    };
  }
}


  1. Create a styled component like this in your component file:
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import styled from 'styled-components';

const Wrapper = styled.div`
  background-color: ${({ theme }) => theme.colors.primary};
  color: ${({ theme }) => theme.colors.secondary};
`;

export default function MyComponent() {
  return (
    <Wrapper>
      Hello World
    </Wrapper>
  );
}


  1. Use ThemeProvider in your _app.tsx file or in a layout component:
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// _app.tsx

import { AppProps } from 'next/app';
import { ThemeProvider } from 'styled-components';

const theme = {
  colors: {
    primary: 'blue',
    secondary: 'white',
  },
};

function MyApp({ Component, pageProps }: AppProps) {
  return (
    <ThemeProvider theme={theme}>
      <Component {...pageProps} />
    </ThemeProvider>
  );
}

export default MyApp;


By following these steps, you can use TypeScript with styled-components in your Next.js project.


How to customize theme variables with styled-components in Next.js?

To customize theme variables with styled-components in Next.js, you can follow these steps:

  1. Create a theme object containing your custom variables. For example:
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const theme = {
  colors: {
    primary: 'blue',
    secondary: 'green',
    background: 'white',
    text: 'black',
  },
  fontSizes: {
    small: '12px',
    medium: '16px',
    large: '24px',
  },
};


  1. Install styled-components and styled-jsx:
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npm install styled-components
npm install styled-jsx


  1. Create a theme.js file and export the theme object:
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export default theme;


  1. Import styled-components and the theme object in your components:
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import styled, { ThemeProvider } from 'styled-components';
import theme from '../theme';


  1. Use the ThemeProvider component to pass the theme object down to your styled-components:
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<ThemeProvider theme={theme}>
  <StyledComponent />
</ThemeProvider>


  1. Use the props.theme object to access the theme variables in your styled-components:
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const StyledComponent = styled.div`
  background-color: ${props => props.theme.colors.background};
  color: ${props => props.theme.colors.text};
  font-size: ${props => props.theme.fontSizes.medium};
`;


Now you can easily customize your theme variables in Next.js using styled-components.


How to test styled-components in Next.js?

To test styled-components in a Next.js application, you can use the built-in testing framework that comes with Next.js, which is Jest. Jest is a popular testing framework for JavaScript applications and provides tools for testing various aspects of your application, including styled-components.


Here are the steps to test styled-components in Next.js using Jest:

  1. Install Jest if you haven't already by running the following command in your terminal:
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npm install --save-dev jest @types/jest


  1. Create a __tests__ directory in your project's root folder to store your test files.
  2. Create a test file for your styled-components in the __tests__ directory. For example, if you have a styled-component called Button, create a test file named Button.test.js.
  3. Write your test cases inside the test file using Jest's testing syntax. For example, you can test if the styled component renders correctly or if it applies the correct styles. Here's an example test case for a Button component: 
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import React from 'react';
import { render } from '@testing-library/react';
import Button from '../components/Button';

test('renders correctly', () => {
  const { getByText } = render(<Button>Click me</Button>);
  const buttonElement = getByText('Click me');
  expect(buttonElement).toBeInTheDocument();
});


  1. Run your tests by running the following command in your terminal:
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npm test


This will run Jest and execute your test cases for the styled-components in your Next.js application.


By following these steps, you can effectively test styled-components in your Next.js application using Jest. Remember to write comprehensive test cases to ensure the reliability and robustness of your application's components.


What is the difference between styled-components and regular CSS in Next.js?

Styled-components is a library that allows you to write CSS inside your JavaScript code. It provides a way to style components in a more dynamic and flexible manner.


Regular CSS in Next.js refers to using traditional CSS files (e.g. styles.css) to style your components. It involves creating separate CSS files and linking them to your components using classNames or IDs.


The main difference between styled-components and regular CSS in Next.js is that styled-components allows you to write CSS directly within your JavaScript code, making it easier to manage styles for individual components. It also offers features like dynamic styles using props and theming support.


Regular CSS, on the other hand, may involve more manual work in terms of managing and organizing your styles, but it can be more familiar to developers who are used to working with separate CSS files.


In summary, styled-components in Next.js offers a more integrated approach to styling components, while regular CSS provides a more traditional method of styling using separate CSS files.

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