What are the steps for implementing webpack 5 configurations in Next.js?

I can't seem to figure out how to properly add experiments to my webpack config.

Here is my current environment:

To set up, I started a new Next.js app using the command npx create-next-app blog

According to the information from the documentation, I need to add a resolutions property to the package.json as shown below:

"dependencies": {
    "next": "10.0.6",
    "react": "17.0.1",
    "react-dom": "17.0.1"
},
"resolutions": {
  "webpack": "5.21.2"
}

In my next.config.js, I have added the following configuration:

const webpack = require("webpack");
console.log(webpack.version); // 5.21.2
module.exports = {
  webpack: function (config, options) {
    console.log(options.webpack.version); // 4.44.1
    config.experiments = {};
    return config;
  },
};

When running yarn dev, I encounter this error:

- configuration[0] has an unknown property 'experiments'.

The issue seems to be that the required version of webpack is 5.21.2, but the version being used in the configuration settings is 4.44.1.

Answer №1

From the release of Next.js v11 onward, Webpack 5 has become the default choice for all Next.js projects:

Webpack 5 is now automatically set up for all Next.js applications. If you haven't customized your webpack configuration, your application is already utilizing webpack 5. For those with custom webpack configurations, you can consult the Next.js webpack 5 documentation for guidance on upgrading.

For previous versions of Next.js, you will need to specify a flag in your next.config.js:

module.exports = {
  future: {
    webpack5: true,
  },
  webpack: function (config, options) {
    console.log(options.webpack.version); // Confirming use of webpack v5
    config.experiments = {};
    return config;
  },
};

If you are upgrading to the latest version of Next.js and prefer to continue using webpack 4, you can do so by adding the webpack5: false option

module.exports = {
  // Note: no `future` key needed here
  webpack5: false,
}

Answer №2

In the latest version of Next.js, webpack 5 is now the default configuration without any additional setup required.

If you prefer to use webpack 4, you can disable webpack 5 by setting webpack5 to false in the next.config.js file.

module.exports = {
    webpack5: false
}

For versions of Next.js prior to 11, you can enable Webpack 5 using the future flag in the next.config.js file.

module.exports = {
    future: {
        webpack5: true
    },
    webpack: function (config, options) {
        console.log(options.webpack.version); // 5.18.0
        config.experiments = {};
        return config;
    }
};

Answer №3

For the most up-to-date information, check out the official Next.js documentation on Webpack 5

Open your next.config.js file

Insert the following code snippet with the future flag

  future: {
    webpack5: true,
  }

This is how my next.config.js looks like

const path = require("path");

module.exports = {
  trailingSlash: true,
  webpackDevMiddleware: (config) => {
    config.watchOptions = {
      poll: 1000,
      aggregateTimeout: 300,
    };

    return config;
  },
  sassOptions: {
    includePaths: [path.join(__dirname, "styles")],
  },
  future: {
    webpack5: true,
  },
};

New Features:

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