@mlz/imagemin-webpack NPM

imagemin-webpack

Why

No extra dependencies (imagemin-gifsicle, imagemin-pngquant) in dependencies section into package.json. You decide for yourself what plugins to use.
This loader and plugin will optimize ANY images regardless of how they were added to webpack. image-webpack-loader don't optimize some images generating favicons-webpack-plugin or copy-webpack-plugin. ImageminWebpackPlugin don't optimize inlined images with url-loader.
Images optimized when inlined with url-loader or svg-url-loader. This can't be done with imagemin-webpack-plugin.
Throttle asynchronous images optimization (using maxConcurrency plugin option). This allows you to not overload a server when building.
All tested.
Persistent cache.
(Optional) Don't crash building process if your have corrupted image(s).

Install

npm install imagemin-webpack --save-dev

Optionals

Images can be optimized in two modes:

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

Note:

imagemin-mozjpeg can be configured in lossless and lossy mode.
imagemin-svgo can be configured in lossless and lossy mode.

Explore the options to get the best result for you.

Recommended basic imagemin plugins for lossless optimization

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

Recommended basic imagemin plugins for lossy optimization

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

Basic

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: "file-loader" // Or `url-loader` or your other loader
          }
        ]
      }
    ]
  },
  plugins: [
    // Make sure that the plugin is after any plugins that add images, example `CopyWebpackPlugin`
    new ImageminPlugin({
      bail: false, // Ignore errors on corrupted images
      cache: true,
      imageminOptions: {
        // Before using imagemin plugins make sure you have added them in `package.json` (`devDependencies`) and installed them

        // 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",
            {
              plugins: [
                {
                  removeViewBox: false
                }
              ]
            }
          ]
        ]
      }
    })
  ]
};

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

Note: Make sure that plugin place after any plugins that add images or other assets which you want to optimized.

Standalone Loader

Documentation: Using loaders

In your webpack.config.js, add the ImageminPlugin.loader, chained with the file-loader or url-loader:

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: "file-loader" // Or `url-loader` or your other loader
          },
          {
            loader: ImageminPlugin.loader,
            options: {
              bail: false, // Ignore errors on corrupted images
              cache: true,
              imageminOptions: {
                plugins: ["gifsicle"]
              }
            }
          }
        ]
      }
    ]
  }
};

Standalone Plugin

Documentation: Using plugins

webpack.config.js

const ImageminWebpack = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");

module.exports = {
  module: {
    rules: [
      {
        loader: "file-loader",
        options: {
          emitFile: true, // Don't forget emit images
          name: "[path][name].[ext]"
        },
        test: /\.(jpe?g|png|gif|svg)$/i
      }
    ]
  },
  plugins: [
    // Make sure that the plugin placed after any plugins that added images
    new ImageminWebpack({
      bail: false, // Ignore errors on corrupted images
      cache: true,
      imageminOptions: {
        plugins: ["gifsicle"]
      },
      // Disable `loader`
      loader: false
    })
  ]
};

Options

Plugin Options

Name	Type	Default	Description
`test`	`{String\/RegExp\\|Array<String\\|RegExp>}`	/.(jpe?g\|png\|gif\|svg)\$/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
`cache`	`{Boolean\\|String}`	`false`	Enable file caching
`bail`	`{Boolean}`	`compiler.options.bail`	Emit warnings instead errors
`imageminOptions`	`{Object}`	`{ plugins: [] }`	Options for `imagemin`
`loader`	`{Boolean}`	`true`	Automatically adding `imagemin-loader` (require for minification images using in `url-loader`, `svg-url-loader` or other)
`maxConcurrency`	`{Number}`	`Math.max(1, os.cpus().length - 1)`	Maximum number of concurrency optimization processes in one time
`name`	`{String}`	`[hash].[ext]`	The target asset name
`manifest`	`{Object}`	`undefined`	Contain optimized list of images from other plugins

`test`

Test to match files against.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

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

`include`

Files to include.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

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

`exclude`

Files to exclude.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

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

`filter`

Allows filtering of images for optimization.

Return true to optimize the image, false otherwise.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

module.exports = {
  plugins: [
    new ImageminPlugin({
      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;
      }
    })
  ]
};

`cache`

Enable/disable file caching. Default path to cache directory: node_modules/.cache/imagemin-webpack.

Be careful: you should remove cache manually when you enable cache using Function configuration for imagemin plugins and change option(s) for plugin(s) (for example for imagemin-gifsicle).

`{Boolean}`

Enable/disable file caching.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

module.exports = {
  plugins: [
    new ImageminPlugin({
      cache: true
    })
  ]
};

`{String}`

Enable file caching and set path to cache directory.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

module.exports = {
  plugins: [
    new ImageminPlugin({
      cache: "path/to/cache"
    })
  ]
};

`bail`

Emit warnings instead errors.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

module.exports = {
  plugins: [
    new ImageminPlugin({
      bail: true
    })
  ]
};

`imageminOptions`

Options for imagemin.

More information and examples here.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");

module.exports = {
  plugins: [
    new ImageminPlugin({
      imageminOptions: {
        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 }
          ]
        ]
      }
    })
  ]
};

`maxConcurrency`

Maximum number of concurrency optimization processes in one time.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

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

`name`

The target asset name.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");

module.exports = {
  plugins: [
    new ImageminPlugin({
      name: "[hash]-compressed.[ext]"
    })
  ]
};

`manifest`

Contain optimized list of images from other plugins.

Note: contains only assets compressed by plugin. Note: manifest will be contain list of optimized images only after emit event.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");
const ManifestPlugin = require("manifest-webpack-plugin");
const manifest = {};

module.exports = {
  plugins: [
    new ImageminPlugin({
      manifest
    }),
    new ManifestPlugin({
      // Contain compressed images
      manifest
    })
  ]
};

Loader Options

Name	Type	Default	Description
`filter`	`{Function}`	`undefined`	Allows filtering of images for optimization
`cache`	`{Boolean\\|String}`	`false`	Enable file caching
`bail`	`{Boolean}`	`compiler.options.bail`	Emit warnings instead errors
`imageminOptions`	`{Object}`	`{ plugins: [] }`	Options for `imagemin`

`filter`

Allows filtering of images for optimization.

Return true to optimize the image, false otherwise.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: "file-loader" // Or `url-loader` or your other loader
          },
          {
            loader: ImageminPlugin.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;
              },
              imageminOptions: {
                plugins: ["gifsicle"]
              }
            }
          }
        ]
      }
    ]
  }
};

`cache`

Enable file caching. Default path to cache directory: node_modules/.cache/imagemin-webpack.

`{Boolean}`

Enable/disable file caching.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: "file-loader" // Or `url-loader` or your other loader
          },
          {
            loader: ImageminPlugin.loader,
            options: {
              cache: true,
              imageminOptions: {
                plugins: ["gifsicle"]
              }
            }
          }
        ]
      }
    ]
  }
};

`{String}`

Enable file caching and set path to cache directory.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: "file-loader" // Or `url-loader` or your other loader
          },
          {
            loader: ImageminPlugin.loader,
            options: {
              cache: "path/to/cache",
              imageminOptions: {
                plugins: ["gifsicle"]
              }
            }
          }
        ]
      }
    ]
  }
};

`bail`

Emit warnings instead errors.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: "file-loader" // Or `url-loader` or your other loader
          },
          {
            loader: ImageminPlugin.loader,
            options: {
              bail: true,
              imageminOptions: {
                plugins: ["gifsicle"]
              }
            }
          }
        ]
      }
    ]
  }
};

`imageminOptions`

Options for imagemin.

More information and examples here.

webpack.config.js

const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");

module.exports = {
  module: {
    rules: [
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: "file-loader" // Or `url-loader` or your other loader
          },
          {
            loader: ImageminPlugin.loader,
            options: {
              bail: true,
              imageminOptions: {
                plugins: [
                  ["gifsicle", { interlaced: true, optimizationLevel: 3 }]
                ]
              }
            }
          }
        ]
      }
    ]
  }
};

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 ImageminPlugin = require("imagemin-webpack");
const imageminJpegtran = require("imagemin-jpegtran");

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

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

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

Additional API

`normalizeConfig(config)`

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

const imagemin = require("imagemin");
const { normalizeConfig } = require("imagemin-webpack");
const imageminConfig = normalizeConfig({
  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'}, …]
})();

imagemin - API for this package.
image-webpack-loader - inspiration, thanks.
imagemin-webpack-plugin - inspiration, thanks.

Contribution

Feel free to push your code if you agree with publishing under the MIT license.

Changelog

CHANGELOG

License

MIT

webpack loader plugin imagemin images minify compress optimize

cacache deepmerge find-cache-dir imagemin loader-utils p-limit serialize-javascript webpack-sources

@infinitebrahmanuniverse/nolb-_ml @everything-registry/sub-chunk-610 @mlz/pack @mlz/pack-beta

5.1.1

6 years ago

@mlz/imagemin-webpack v5.1.1

imagemin-webpack

Why

Install

Optionals

Basic

Standalone Loader

Standalone Plugin

Options

Plugin Options

`test`

`include`

`exclude`

`filter`

`cache`

`{Boolean}`

`{String}`

`bail`

`imageminOptions`

`maxConcurrency`

`name`

`manifest`

Loader Options

`filter`

`cache`

`{Boolean}`

`{String}`

`bail`

`imageminOptions`

Examples

Optimize images based on size

Additional API

`normalizeConfig(config)`

Related

Contribution

Changelog

License