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Imagemin Webpack

Plugin and Loader for webpack to optimize (compress) all images using imagemin. Do not worry about size of images, now they are always optimized/compressed.

npm node deps tests cover chat size

image-minimizer-webpack-plugin

Getting Started

This plugin can use 2 tools to compress images:

  • imagemin - optimize your images by default, since it is stable and works with all types of images
  • squoosh - while working in experimental mode with .jpg, .jpeg, .png, .webp, .avif file types.

To begin, you'll need to install image-minimizer-webpack-plugin:

$ npm install image-minimizer-webpack-plugin --save-dev

Images can be optimized in two modes:

  1. Lossless (without loss of quality).
  2. Lossy (with loss of quality).

Optimize with imagemin

Note:

Explore the options to get the best result for you.

Recommended imagemin plugins for lossless optimization

npm install imagemin-gifsicle imagemin-jpegtran imagemin-optipng imagemin-svgo --save-dev

Recommended imagemin plugins for lossy optimization

npm install imagemin-gifsicle imagemin-mozjpeg imagemin-pngquant imagemin-svgo --save-dev

For imagemin-svgo v9.0.0+ need use svgo configuration

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
const { extendDefaultPlugins } = require("svgo");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
    ],
  },
  plugins: [
    new ImageMinimizerPlugin({
      minimizerOptions: {
        // Lossless optimization with custom option
        // Feel free to experiment with options for better result for you
        plugins: [
          ["gifsicle", { interlaced: true }],
          ["jpegtran", { progressive: true }],
          ["optipng", { optimizationLevel: 5 }],
          // Svgo configuration here https://github.com/svg/svgo#configuration
          [
            "svgo",
            {
              plugins: extendDefaultPlugins([
                {
                  name: "removeViewBox",
                  active: false,
                },
                {
                  name: "addAttributesToSVGElement",
                  params: {
                    attributes: [{ xmlns: "http://www.w3.org/2000/svg" }],
                  },
                },
              ]),
            },
          ],
        ],
      },
    }),
  ],
};

Optimize with squoosh

$ npm install @squoosh/lib --save-dev

Recommended @squoosh/lib options for lossy optimization

For lossy optimization we recommend using the default settings @squoosh/lib. The default values and supported file types for each option can be found in the [codecs.ts](https://github.com/GoogleChromeLabs/squoosh/blob/dev/libsquoosh/src/codecs.ts) file under codecs.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png)$/i,
        type: "asset",
      },
    ],
  },
  plugins: [
    new ImageMinimizerPlugin({
      minify: ImageMinimizerPlugin.squooshMinify,
    }),
  ],
};

Recommended squoosh options for lossless optimization

For lossless optimization we recommend using the options listed below in minimizerOptions.encodeOptions.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png)$/i,
        type: "asset",
      },
    ],
  },
  plugins: [
    new ImageMinimizerPlugin({
      minify: ImageMinimizerPlugin.squooshMinify,
      minimizerOptions: {
        encodeOptions: {
          mozjpeg: {
            // That setting might be close to lossless, but it’s not guaranteed
            // https://github.com/GoogleChromeLabs/squoosh/issues/85
            quality: 100,
          },
          webp: {
            lossless: 1,
          },
          avif: {
            // https://github.com/GoogleChromeLabs/squoosh/blob/dev/codecs/avif/enc/README.md
            cqLevel: 0,
          },
        },
      },
    }),
  ],
};

ℹ️ If you want to use loader or plugin standalone see sections below, but this is not recommended.

Standalone Loader

Documentation: Using loaders

In your webpack.config.js, add the ImageMinimizerPlugin.loader and specify the asset modules options:

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              severityError: "warning", // Ignore errors on corrupted images
              minimizerOptions: {
                plugins: ["gifsicle"],
              },
            },
          },
        ],
      },
    ],
  },
};

Standalone Plugin

Documentation: Using plugins

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
    ],
  },
  plugins: [
    // Make sure that the plugin placed after any plugins that added images
    new ImageMinimizerPlugin({
      severityError: "warning", // Ignore errors on corrupted images
      minimizerOptions: {
        plugins: ["gifsicle"],
      },
      // Disable `loader`
      loader: false,
    }),
  ],
};

Options

Plugin Options

Name Type Default Description
test {String\/RegExp|Array<String|RegExp>} /.(jpe?g|png|gif|tif|webp|svg|avif)$/i Test to match files against
include {String\/RegExp|Array<String|RegExp>} undefined Files to include
exclude {String\/RegExp|Array<String|RegExp>} undefined Files to exclude
filter {Function} () => true Allows filtering of images for optimization
severityError {String} 'error' Allows to choose how errors are displayed
minify {Function | Array<Function>} ImageMinimizerPlugin.imageminMinify Allows to override default minify function
minimizerOptions {Object|Array<Object>} { plugins: [] } Options for imagemin
loader {Boolean} true Automatically adding imagemin-loader
maxConcurrency {Number} Math.max(1, os.cpus().length - 1) Maximum number of concurrency optimization processes in one time
filename {string|Function} '[path][name][ext]' Allows to set the filename for the generated asset. Useful for converting to a webp
deleteOriginalAssets {Boolean} false Allows to delete the original asset. Useful for converting to a webp and remove original assets

test

Type: String|RegExp|Array<String|RegExp> Default: /\.(jpe?g\|png\|gif\|tif\|webp\|svg\|avif)\$/i

Test to match files against.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      test: /\.(jpe?g|png|gif|svg)$/i,
    }),
  ],
};

include

Type: String|RegExp|Array<String|RegExp> Default: undefined

Files to include.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      include: /\/includes/,
    }),
  ],
};

exclude

Type: String|RegExp|Array<String|RegExp> Default: undefined

Files to exclude.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      exclude: /\/excludes/,
    }),
  ],
};

filter

Type: Function Default: () => true

Allows filtering of images for optimization.

Return true to optimize the image, false otherwise.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      filter: (source, sourcePath) => {
        // The `source` argument is a `Buffer` of source file
        // The `sourcePath` argument is an absolute path to source
        if (source.byteLength < 8192) {
          return false;
        }

        return true;
      },
    }),
  ],
};

severityError

Type: String Default: 'error'

Allows to choose how errors are displayed.

Сan have the following values:

  • 'off' - suppresses errors and warnings
  • 'warning' - emit warnings instead errors
  • 'error' - emit errors

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      severityError: "warning",
    }),
  ],
};

minify

Type: Function|Array<Function> Default: ImageMinimizerPlugin.imageminMinify

Allows to override default minify function. By default plugin uses imagemin package. Useful for using and testing unpublished versions or forks.

Аvailable minifiers:

  • ImageMinimizerPlugin.imageminMinify
  • ImageMinimizerPlugin.squooshMinify
Function

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      minify: async (data, minimizerOptions) => {
        const [[, input]] = Object.entries(data);

        let result;

        try {
          result = await minifyAndReturnBuffer(input);
        } catch (error) {
          // Return original input if there was an error
          return { data: input, errors: [error] };
        }

        return { data: result, warnings: [], errors: [] };
      },
      minimizerOptions: {},
    }),
  ],
};
Array

If an array of functions is passed to the minify option, the minimizerOptions can be an array or an object. If minimizerOptions is array, the function index in the minify array corresponds to the options object with the same index in the minimizerOptions array. If you use minimizerOptions like object, all minify function accept it.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      minify: [
        ImageMinimizerPlugin.imageminMinify,
        (data, minimizerOptions) => {
          const [[, input]] = Object.entries(data);

          let result;

          try {
            result = minifyAndReturnBuffer(input);
          } catch (error) {
            // Return original input if there was an error
            return { data: input, errors: [error] };
          }

          return { data: result, warnings: [], errors: [] };
        },
      ],
      minimizerOptions: [
        // Options for the first function (ImageMinimizerPlugin.imageminMinify)
        {
          plugins: ["gifsicle", "mozjpeg", "pngquant", "svgo"],
        },
        // Options for the second function
        {},
      ],
    }),
  ],
};

minimizerOptions

Type: Object|Array<Object> Default: { plugins: [] }

Options for minify functions. imagemin is default minify function.

More information and examples here.

Object

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      minimizerOptions: {
        plugins: [
          // Name
          "gifsicle",
          // Name with options
          ["mozjpeg", { quality: 80 }],
          // Full package name
          [
            "imagemin-svgo",
            {
              plugins: [
                {
                  removeViewBox: false,
                },
              ],
            },
          ],
          [
            // Custom package name
            "nonstandard-imagemin-package-name",
            { myOptions: true },
          ],
        ],
      },
    }),
  ],
};
Array

The function index in the minify array corresponds to the options object with the same index in the minimizerOptions array. If you use minimizerOptions like object, all minify function accept it.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      minify: [
        ImageMinimizerPlugin.imageminMinify,
        async (data, minimizerOptions) => {
          const [[, input]] = Object.entries(data);

          let result;

          try {
            result = await minifyAndReturnBuffer(input);
          } catch (error) {
            // Return original input if there was an error
            return { data: input, errors: [error] };
          }

          return { data: result, warnings: [], errors: [] };
        },
      ],
      minimizerOptions: [
        // Options for the first function (ImageMinimizerPlugin.imageminMinify)
        {
          plugins: ["gifsicle", "mozjpeg", "pngquant", "svgo"],
        },
        // Options for the second function
        {},
      ],
    }),
  ],
};

loader

Type: Boolean Default: true

Automatically adding imagemin-loader.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      loader: false,
    }),
  ],
};

maxConcurrency

Type: Number Default: Math.max(1, os.cpus().length - 1)

Maximum number of concurrency optimization processes in one time.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      maxConcurrency: 3,
    }),
  ],
};

filename

Type: String|Function Default: '[path][name][ext]'

Allows to set the filename for the generated asset. Useful for converting to a webp. Supported values see in webpack template strings, File-level section.

String

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    // Images are converted to `webp` and the original assets have been kept
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      filename: "[path][name].webp",
      minimizerOptions: {
        plugins: ["imagemin-webp"],
      },
    }),
  ],
};
Function

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    // Images are converted to `webp` and the original assets have been kept
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      filename: (pathData, assetInfo) => {
        if (/imageLg/i.test(pathData.filename)) {
          return "./bigImages/[path][name].webp";
        }

        return "[path][name].webp";
      },
      minimizerOptions: {
        plugins: ["imagemin-webp"],
      },
    }),
  ],
};
Converting to webp using ImageMinimizerPlugin.squooshMinify

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
/*
const defaultTargets = {
  ".png": "oxipng",
  ".jpg": "mozjpeg",
  ".jpeg": "mozjpeg",
  ".jxl": "jxl",
  ".webp": "webp",
  ".avif": "avif",
};
*/

module.exports = {
  plugins: [
    // Images are converted to `webp` and the original assets have been kept
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      filename: "[path][name].webp",
      minify: ImageMinimizerPlugin.squooshMinify,
      minimizerOptions: {
        targets: {
          ".png": "webp",
        },
      },
    }),
  ],
};

deleteOriginalAssets

Type: Boolean Default: false

Allows to remove original assets. Useful for converting to a webp and remove original assets

ℹ️ Doesn't make sense if you haven't changed the original value of the filename option

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    // Images are converted to `webp` and the original assets have been removed
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      deleteOriginalAssets: true,
      filename: "[path][name].webp",
      minimizerOptions: {
        plugins: ["imagemin-webp"],
      },
    }),
  ],
};

To generate and compress the original assets:

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    // And the original assets will be compressed
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      minimizerOptions: {
        plugins: ["pngquant"],
      },
    }),
    // Images are converted to `webp` and the original assets have been removed
    new ImageMinimizerPlugin({
      test: /\.(png)$/i,
      deleteOriginalAssets: false,
      filename: "[path][name].webp",
      minimizerOptions: {
        plugins: ["imagemin-webp"],
      },
    }),
  ],
};

Loader Options

Name Type Default Description
filter {Function} undefined Allows filtering of images for optimization
severityError {String} 'error' Allows to choose how errors are displayed
minify {Function | Array<Function>} ImageMinimizerPlugin.imageminMinify Allows to override default minify function
minimizerOptions {Object|Array<Object>} { plugins: [] } Options for imagemin
filename {string|Function} '[path][name][ext]' Allows to set the filename for the generated asset. Useful for converting to a webp
deleteOriginalAssets {Boolean} false Allows to delete the original asset. Useful for converting to a webp and remove original assets

filter

Type: Function Default: () => true

Allows filtering of images for optimization.

Return true to optimize the image, false otherwise.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              cache: true,
              filter: (source, sourcePath) => {
                // The `source` argument is a `Buffer` of source file
                // The `sourcePath` argument is an absolute path to source
                if (source.byteLength < 8192) {
                  return false;
                }

                return true;
              },
              minimizerOptions: {
                plugins: ["gifsicle"],
              },
            },
          },
        ],
      },
    ],
  },
};

severityError

Type: String Default: 'error'

Allows to choose how errors are displayed.

Сan have the following values:

  • 'off' - suppresses errors and warnings
  • 'warning' - emit warnings instead errors
  • 'error' - emit errors

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              severityError: "warning",
              minimizerOptions: {
                plugins: ["gifsicle"],
              },
            },
          },
        ],
      },
    ],
  },
};

minify

Type: Function|Array<Function> Default: ImageMinimizerPlugin.imageminMinify

Allows to override default minify function. By default plugin uses imagemin package. Useful for using and testing unpublished versions or forks.

Аvailable minifiers:

  • ImageMinimizerPlugin.imageminMinify
  • ImageMinimizerPlugin.squooshMinify
Function

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              minify: async (data, minimizerOptions) => {
                const [[, input]] = Object.entries(data);

                let result;

                try {
                  result = await minifyAndReturnBuffer(input);
                } catch (error) {
                  // Return original input if there was an error
                  return { data: input, errors: [error] };
                }

                return { data: result, warnings: [], errors: [] };
              },
              minimizerOptions: {},
            },
          },
        ],
      },
    ],
  },
};
Array

If an array of functions is passed to the minify option, the minimizerOptions can be an array or an object. If minimizerOptions is array, the function index in the minify array corresponds to the options object with the same index in the minimizerOptions array. If you use minimizerOptions like object, all minify function accept it.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              minify: [
                ImageMinimizerPlugin.imageminMinify,
                async (data, minimizerOptions) => {
                  const [[, input]] = Object.entries(data);

                  let result;

                  try {
                    result = await minifyAndReturnBuffer(input);
                  } catch (error) {
                    // Return original input if there was an error
                    return { data: input, errors: [error] };
                  }

                  return { data: result, warnings: [], errors: [] };
                },
              ],
              minimizerOptions: [
                // Options for the first function (ImageMinimizerPlugin.imageminMinify)
                {
                  plugins: ["gifsicle", "mozjpeg", "pngquant", "svgo"],
                },
                // Options for the second function
                {},
              ],
            },
          },
        ],
      },
    ],
  },
};

minimizerOptions

Type: Object|Array<Object> Default: { plugins: [] }

Options for minify functions. imagemin is default minify function.

More information and examples here.

Object

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              minimizerOptions: {
                plugins: [
                  ["gifsicle", { interlaced: true, optimizationLevel: 3 }],
                ],
              },
            },
          },
        ],
      },
    ],
  },
};
Array

The function index in the minify array corresponds to the options object with the same index in the minimizerOptions array. If you use minimizerOptions like object, all minify function accept it.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        type: "asset",
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              minify: [
                ImageMinimizerPlugin.imageminMinify,
                async (data, minimizerOptions) => {
                  const [[, input]] = Object.entries(data);

                  let result;

                  try {
                    result = await minifyAndReturnBuffer(input);
                  } catch (error) {
                    // Return original input if there was an error
                    return { data: input, errors: [error] };
                  }

                  return { data: result, warnings: [], errors: [] };
                },
              ],
              minimizerOptions: [
                // Options for the first function (ImageMinimizerPlugin.imageminMinify)
                {
                  plugins: [
                    ["gifsicle", { interlaced: true, optimizationLevel: 3 }],
                  ],
                },
                // Options for the second function
                {},
              ],
            },
          },
        ],
      },
    ],
  },
};

filename

Type: String|Function Default: '[path][name][ext]'

Allows to set the filename for the generated asset. Useful for converting to a webp. Supported values see in webpack template strings, File-level section.

String

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif)$/i,
        use: [
          {
            test: /\.(jpe?g|png|gif|svg)$/i,
            type: "asset",
          },
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              filename: "[path][name].webp",
              minimizerOptions: {
                plugins: ["imagemin-webp"],
              },
            },
          },
        ],
      },
    ],
  },
};
Function

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif)$/i,
        use: [
          {
            test: /\.(jpe?g|png|gif|svg)$/i,
            type: "asset",
          },
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              filename: (pathData, assetInfo) => {
                if (/imageLg/i.test(pathData.filename)) {
                  return "./bigImages/[path][name].webp";
                }

                return "[path][name].webp";
              },
              minimizerOptions: {
                plugins: ["imagemin-webp"],
              },
            },
          },
        ],
      },
    ],
  },
};

deleteOriginalAssets

Type: Boolean Default: false

Allows to keep the original asset. Useful for converting to a webp and remove original assets.

ℹ️ Doesn't make sense if you haven't changed the original value of the filename option

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(png)$/i,
        use: [
          {
            test: /\.(jpe?g|png|gif|svg)$/i,
            type: "asset",
          },
          {
            loader: ImageMinimizerPlugin.loader,
            options: {
              // PNG images are converted to WEBP, and the originals will keep
              deleteOriginalAssets: false,
              filename: "[path][name].webp",
              minimizerOptions: {
                plugins: ["imagemin-webp"],
              },
            },
          },
        ],
      },
    ],
  },
};

Additional API

normalizeImageminConfig(config)

The function normalizes configuration (converts plugins names and options to Functions) for using in imagemin package directly.

const imagemin = require("imagemin");
const { normalizeImageminConfig } = require("image-minimizer-webpack-plugin");
const imageminConfig = normalizeImageminConfig({
  plugins: [
    "jpegtran",
    [
      "pngquant",
      {
        quality: [0.6, 0.8],
      },
    ],
  ],
});

/*
  console.log(imageminConfig);
  =>
  {
    plugins: [Function, Function],
    pluginsMeta: [
      { name: "imagemin-jpegtran", version: "x.x.x", options: {} },
      { name: "imagemin-pngquant", version: "x.x.x", options: { quality: [0.6, 0.8] }
    ]
  }
*/

(async () => {
  const files = await imagemin(["images/*.{jpg,png}"], {
    destination: "build/images",
    plugins: imageminConfig.plugins,
  });

  console.log(files);
  // => [{data: <Buffer 89 50 4e …>, path: 'build/images/foo.jpg'}, …]
})();

Examples

Optimize images based on size

You can use difference options (like progressive/interlaced and etc) based on image size (example - don't do progressive transformation for small images).

What is progressive image? Answer here.

webpack.config.js

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  minimizer: [
    new ImageMinimizerPlugin({
      // Only apply this one to files equal to or over 8192 bytes
      filter: (source) => {
        if (source.byteLength >= 8192) {
          return true;
        }

        return false;
      },
      minimizerOptions: {
        plugins: [["jpegtran", { progressive: true }]],
      },
    }),
    new ImageMinimizerPlugin({
      // Only apply this one to files under 8192
      filter: (source) => {
        if (source.byteLength < 8192) {
          return true;
        }

        return false;
      },
      minimizerOptions: {
        plugins: [["jpegtran", { progressive: false }]],
      },
    }),
  ],
};

Optimize and transform images to webp

const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");

module.exports = {
  plugins: [
    new ImageMinimizerPlugin({
      minimizerOptions: {
        plugins: ["pngquant"],
      },
    }),
    new ImageMinimizerPlugin({
      deleteOriginalAssets: false,
      filename: "[path][name].webp",
      minimizerOptions: {
        plugins: ["imagemin-webp"],
      },
    }),
  ],
};

Contributing

Please take a moment to read our contributing guidelines if you haven't yet done so.

CONTRIBUTING

License

MIT