Styling Addon: configure styles and themes in StorybookAutomate with Chromatic
Storybook Day 2023
Back to integrations
Add your integration
  • ⭐️ Popular
  • 🧩 Essentials
  • 🛠 Code
  • ⚡️ Data & state
  • ✅ Test
  • 💅 Style
  • 🎨 Design
  • ⚙️ Appearance
  • 🗄 Organize
How to install addons Create an addon
Storybook decorator to enable automatic generation and displaying of CSS pseudo states for components.
npm install @ergosign/storybook-addon-pseudo-states-lit
Last updated about 1 year ago
Downloads per week
Readme View on GitHub

Storybook Addon Pseudo States

Storybook Addon Pseudo States allows you to automatically display pseudo states (and attribute states) of a component in Storybook's preview area.

Framework Support

Framework Display States Tool-Button to show/hide
Angular + +
React + +
Lit + +
HTML + +
Vue + +

Getting started

First of all, you need to install Pseudo States into your project as a dev dependency.

npm install @ergosign/storybook-addon-pseudo-states-lit --save-dev

Then, configure it as an addon by adding it to your main.js file (located in the Storybook config directory).

To display the pseudo states, you have to add specific css classes to your styling, see Styling

Then, you can set the decorator locally, see Usage.


Automatically generated with PostCss Webpack config (recommended)

Preset-Postcss adds postcss-loader to Storybook's custom webpack config.

You must also install postcss-pseudo-classes. Unfortunately, latest version is only tagged and not released. Please use at least tagged version 0.3.0

npm install postcss-pseudo-classes@0.3.0 --save-dev

Then add the preset preset-postcss to your configuration in main.js (located in the Storybook config directory):


module.exports = {
  presets: ['@ergosign/storybook-addon-pseudo-states-lit/preset-postcss'],

You can modify post css loader options (see type definition of PseudoStatesPresetOptions):

module.exports = {
   presets: [
            name: '@ergosign/storybook-addon-pseudo-states-lit/preset-postcss',
            options: {
                rules: [/\.scss$|\.sass$/, ".sass", ...],
                cssLoaderOptions: CssLoaderOptions,
                postCssLoaderPseudoClassesPluginOptions: {
                    prefix: 'pseudo-sates--', // default for angular
                    blacklist: [':nth-child', ':nth-of-type']

If postCssLoaderOptions are not set, the preset tries to add postcss-loader to all available scss|sass rules.

Show/Hide Toolbar-Button

You can enable a toolbar button that toggles the Pseudo States in the Preview area.

Enable the button by adding it to your main.js file (located in the Storybook config directory):

// main.js

module.exports = {
  addons: [
      name: '@ergosign/storybook-addon-pseudo-states-lit',
      options: {
        visibleByDefault: true,

visibleByDefault option defaults to false


WARNING: withPseudo should always the first element in your decorators array because it alters the template of the story.

Component Story Format (CSF, recommended)

import { withPseudo } from '@ergosign/storybook-addon-pseudo-states-lit';

//not tested yet

storyOf Format

import { withPseudo } from '@ergosign/storybook-addon-pseudo-states-lit';

storiesOf('Button', module)
    withPseudo: {
      selector: 'button', // css selector of pseudo state's host element
      pseudo: ['focus', 'hover', 'hover & focus', 'active'],
      attributes: ['disabled', 'readonly', 'error']
  .add('Icon Button', () => <Button />);

There is a default configuration for selector, pseudos and attributes. Thus, you can leave withPseudo options empty.

Parameters & Types

See Types

Join the community
6,055 developers and counting
WhyWhy StorybookComponent-driven UI
Open source software

Maintained by
Special thanks to Netlify and CircleCI