Angular 20 Storybook Tailwind Addons

Goal

Install, repair, or verify Storybook for Angular 20 + Tailwind projects. Ensure stories render with the app's global Tailwind styles and that themes, designs, and a11y addons are configured. Optionally set up Chromatic CLI when explicitly requested.

Inputs

• projectRoot (string, default: current working directory)
• globalStylePath (string, default: auto-detect from angular.json styles list; fallback src/styles.css then src/styles.scss)
• installChromaticCli (boolean, default: false, install only on explicit request)
• runVerification (boolean, default: true)

Preconditions

• angular.json exists in projectRoot.
• The project already has Tailwind configured in a global stylesheet. If not, use $angular-tailwind-setup to install and configure Tailwind CSS.
• Use the repo package manager; examples below use npm.

Success Criteria

• Storybook is installed and npm run storybook starts.
• .storybook/preview.ts imports the global stylesheet used by the Angular app.
• .storybook/main.ts includes all required addons:
  • @storybook/addon-a11y
  • @storybook/addon-themes
  • @storybook/addon-designs
• Theme switching works with class-based Tailwind dark mode.
• At least one story shows a parameters.design example.
• If installChromaticCli=true, chromatic can be invoked from npm run chromatic.

Workflow

1. Validate workspace and detect versions

   • Read package.json and confirm Angular major version (@angular/core) is close to 20.
   • Abort with an error if major is not exactly 20.
   • Detect Storybook version if already installed (for addon compatibility checks).
   • Resolve the global style file from angular.json > build.options.styles; fallback to src/styles.css or src/styles.scss.

2. Install Storybook (Angular preset)

   • Run from projectRoot:
   bashCopy

   npx storybook@latest init
   

   • Keep Angular framework defaults from the installer.
   • Ensure .storybook/main.ts and .storybook/preview.ts were created.
   • Run once after installation:
   bashCopy

   npm run storybook
   

3. Install required addons

   bashCopy

   npm i -D @storybook/addon-themes @storybook/addon-designs @storybook/addon-a11y
   

   • Check @storybook/addon-designs compatibility with the installed Storybook major.
   • If needed, pin @storybook/addon-designs to the matching major range.
   • If installChromaticCli=true, run:
   bashCopy

   npm i -D chromatic
   

4. Configure .storybook/main.ts

   • Ensure framework.name is @storybook/angular.
   • Ensure stories includes both MDX and stories globs.
   • Ensure addons includes all required addons exactly once.
   • Merge with existing config instead of destructive overwrite.
   tsCopy

   import type { StorybookConfig } from '@storybook/angular';
   
   const config: StorybookConfig = {
     framework: {
       name: '@storybook/angular',
       options: {},
     },
     stories: ['../src/**/*.mdx', '../src/**/*.stories.@(ts|tsx)'],
     addons: [
       '@storybook/addon-a11y',
       '@storybook/addon-themes',
       '@storybook/addon-designs',
     ],
   };
   
   export default config;
   

5. Configure .storybook/preview.ts

   • Import the Angular global stylesheet used by Tailwind.
   • Add themes decorator for class-based switching (light -> empty class, dark -> dark class).
   • Keep existing parameters and decorators when present.
   tsCopy

   import '../src/styles.css';
   import type { Preview } from '@storybook/angular';
   import { withThemeByClassName } from '@storybook/addon-themes';
   
   const preview: Preview = {
     decorators: [
       withThemeByClassName({
         themes: { light: '', dark: 'dark' },
         defaultTheme: 'light',
       }),
     ],
   };
   
   export default preview;
   

   • Use styles.scss import when the project global style file is SCSS.

6. Add a minimal design-panel example

   • Add or update a story with parameters.design so the Designs panel is visible.
   tsCopy

   export const Primary = {
     args: { label: 'Button' },
     parameters: {
       design: {
         type: 'figma',
         url: 'https://www.figma.com/file/XXXX/YourFile?node-id=123-456',
       },
     },
   };
   

7. Verify

   • Run npm run storybook and confirm no startup errors.
   • Confirm Tailwind classes render in stories.
   • Confirm A11y panel appears in Storybook UI.
   • Confirm theme switcher toggles classes on the preview root.
   • Confirm Design panel appears for stories with parameters.design.
   • If installChromaticCli=true, run npm run chromatic -- --help and confirm CLI is available.

Guardrails

• Do not replace existing Storybook config wholesale; merge settings safely.
• Do not assume src/styles.css; detect and import the actual configured global style file.
• Keep addon entries unique; avoid duplicate addon registrations.
• If Tailwind styles are not visible, check style import path first, then verify Tailwind directives in the imported file.
• Do not install Chromatic unless explicitly requested.