Storybook Addon Sass PostCSS

Description

The Storybook PostCSS addon can be used to run the PostCSS preprocessor with Sass support against your stories in Storybook.

Getting Started

Install this addon by adding the storybook-addon-sass-postcss dependency:

yarn add -D storybook-addon-sass-postcss

within .storybook/main.js:

module.exports = {
  addons: ['storybook-addon-sass-postcss'],
};

and create a PostCSS config in the base of your project, like postcss.config.js, that contains:

module.exports = {
  // Add your installed PostCSS plugins here:
  plugins: [
    // require('autoprefixer'),
    // require('postcss-color-rebeccapurple'),
  ],
};

PostCSS 8+

If your project requires you to be using PostCSS v8, you can replace the included PostCSS by passing postcssLoaderOptions to this addon.

First, you'll need to install PostCSS v8 as a dependency of your project:

yarn add -D postcss@^8

Then, you'll need to update your addons config. Within .storybook/main.js:

module.exports = {
  addons: [
-   'storybook-addon-sass-postcss',
+   {
+     name: 'storybook-addon-sass-postcss',
+     options: {
+       postcssLoaderOptions: {
+         implementation: require('postcss'),
+       },
+     },
+   },
  ]
}

When running Storybook, you'll see the version of PostCSS being used in the logs. For example:

info => Using PostCSS preset with postcss@8.2.4

Dart Sass

Similar to above, you can provide reference to your local Sass transpiler to invoke Dart Sass.

First, you'll need to install PostCSS v8 as a dependency of your project:

yarn add -D sass

Then, you'll need to update your addons config. Within .storybook/main.js:

module.exports = {
  addons: [
-   'storybook-addon-sass-postcss',
+   {
+     name: 'storybook-addon-sass-postcss',
+     options: {
+       sassLoaderOptions: {
+         implementation: require('sass'),
+       },
+     },
+   },
  ]
}

Sass Only

Be default, this plugin will try to transform both CSS and SASS modules. You can change this behaviour by passing optional argument rule.

module.exports = {
  addons: [
-   'storybook-addon-sass-postcss',
+   {
+     name: 'storybook-addon-sass-postcss',
+     options: {
+       rule: {
+         test: /\.(scss|sass)$/i,
+       },
+     },
+   },
  ]
}

Using with TailwindCSS

By default, Sass loading is done before PostCSS preprocessing. But this does not work well with TailwindCSS. As it relies on classnames and non-standard behaviours that are only exposed via PostCSS plugin. So to overcome this, Sass must be loaded after preprocessing has been done.

module.exports = {
  addons: [
-   'storybook-addon-sass-postcss',
+   {
+     name: 'storybook-addon-sass-postcss',
+     options: {
+       loadSassAfterPostCSS: true,
+     },
+   },
  ]
}

Loader Options

You can specify loader options for style-loader, css-loader, sass-loader and postcss-loader by passing options to this addon as styleLoaderOptions, cssLoaderOptions, sassLoaderOptions or postcssLoaderOptions respectively.