image-webpack-loader

Image loader module for webpack

Minify PNG, JPEG, GIF, SVG and WEBP images with imagemin

Issues with the output should be reported on the imagemin issue tracker.

Install

$ npm install image-webpack-loader --save-dev

libpng issues

Installing on some versions of OSX may raise errors with a missing libpng dependency:

Module build failed: Error: dyld: Library not loaded: /usr/local/opt/libpng/lib/libpng16.16.dylib

This can be remedied by installing the newest version of libpng with homebrew:

brew install libpng

Usage

Documentation: Using loaders

In your webpack.config.js, add the image-loader, chained after the file-loader:

rules: [{
  test: /\.(gif|png|jpe?g|svg)$/i,
  use: [
    'file-loader',
    {
      loader: 'image-webpack-loader',
      options: {
        bypassOnDebug: true,
      },
    },
  ],
}]

For each optimizer you wish to configure, specify the corresponding key in options:

rules: [{
  test: /\.(gif|png|jpe?g|svg)$/i,
  use: [
    'file-loader',
    {
      loader: 'image-webpack-loader',
      options: {
        mozjpeg: {
          progressive: true,
          quality: 65
        },
        // optipng.enabled: false will disable optipng
        optipng: {
          enabled: false,
        },
        pngquant: {
          quality: '65-90',
          speed: 4
        },
        gifsicle: {
          interlaced: false,
        },
        // the webp option will enable WEBP
        webp: {
          quality: 75
        }
      }
    },
  ],
}]

Comes bundled with the following optimizers, which are automatically enabled by default:

• mozjpeg — Compress JPEG images
• optipng — Compress PNG images
• pngquant — Compress PNG images
• svgo — Compress SVG images
• gifsicle — Compress GIF images

And optional optimizers:

• webp — Compress JPG & PNG images into WEBP

Default optimizers can be disabled by specifying optimizer.enabled: false, and optional ones can be enabled by simply putting them in the options

If you are using Webpack 1, take a look at the old docs (or consider upgrading).

Options

Loader options:

bypassOnDebug (all)

Type: boolean Default: false

Using this, no processing is done when webpack 'debug' mode is used and the loader acts as a regular file-loader. Use this to speed up initial and, to a lesser extent, subsequent compilations while developing or using webpack-dev-server. Normal builds are processed normally, outputting optimized files.

For optimizer options, an up-to-date and exhaustive list is available on each optimizer repository:

• mozjpeg
• optipng
• pngquant
• svgo
• gifsicle
• webp

Inspiration

• gulp-imagemin
• file-loader
• imagemin-pngquant

License

MIT (http://www.opensource.org/licenses/mit-license.php)