PostCSS Webp

PostCSS plugin for add webp prefix to css.

Before:

.foo {
  background-image: url(./bg.png);
}

After:

.foo {
  background-image: url(./bg.png);
}
.webp .foo {
  background-image: url(./bg.png?x-oss-process=image/format, webp);
}

Requirements

Set webp class in your html. For example:

var isSupportWebp =
  !![].map && document.createElement('canvas').toDataURL('image/webp').indexOf('data:image/webp') === 0
if (isSupportWebp) {
  document.documentElement.classList.add('webp')
}

Add [query] to name of url-loader or file-loader options. For example:

{
  test: /\.(png|jpe?g|gif)$/,
  use: [
    {
      loader: 'url-loader',
      options: {
        limit: 1024 * 2,
        name: 'images/[name].[contenthash].[ext][query]'
      }
    }
  ]
}

Usage

Check you project for existed PostCSS config: postcss.config.js in the project root, "postcss" section in package.json or postcss in bundle config.

If you already use PostCSS, add the plugin to plugins list:

module.exports = {
  plugins: [
+   require('postcss-webp'),
    require('autoprefixer')
  ]
}

If you do not use PostCSS, add it according to official docs and set this plugin in settings.

Options

webpClass

Type: string Default: 'webp'

Class name of 1px border for retina devices

prefix

Type: string Default: 'x-oss-process=image/format,webp'

Prefix query for webp image, aliyun oss by default

cssModules

Type: boolean Default: false

if you have [cssModules] enabled, set to true [cssmodules]: https://github.com/webpack-contrib/css-loader#modules

ignoreComment

Type: string Default: 'webp-ignore'

Set comment to ignored

ignore whole rule

/* webp-ignore */
.foo {
  background-image: url(./bg.png);
}

ignore single property

.foo {
  background-image: url(./bg.png); /* webp-ignore */
}