Storybook Skill | Agent Skills

Storybook

Overview

Storybook is a frontend workshop for building UI components and pages in isolation. It helps develop and share hard-to-reach states and edge cases without running the whole app. Use it for UI development, testing, and documentation.

Core concepts: Stories (rendered component states), CSF (Component Story Format), args (props/inputs), decorators (wrappers), play functions (interaction tests).

Requirements: Node.js 20+, npm 10+ or pnpm 9+ or Yarn 4+, Vite 5+ or Webpack 5+, TypeScript 4.9+ (optional).

Installation

Run inside the project root:

npm create storybook@latest

The CLI detects the framework (Next.js, Vite, React, Vue, Angular, Svelte, etc.) and configures accordingly. For manual framework selection:

npm create storybook@latest --type nextjs
# or: react, vue3, angular, svelte, sveltekit, etc.

Recommended: Use @storybook/nextjs-vite for Next.js projects (faster than Webpack). Use @storybook/react-vite for Vite + React.

After install, run: npm run storybook (dev server, typically port 6006). Build: npm run build-storybook.

Project structure: system directory

Place components in a system/ directory, with each component in its own folder. Colocate the story file alongside the component — this keeps documentation and tests next to the source and follows Storybook best practices.

system/
├── Button/
│   ├── Button.tsx
│   └── Button.stories.tsx
├── Card/
│   ├── Card.tsx
│   └── Card.stories.tsx
├── Dialog/
│   ├── Dialog.tsx
│   └── Dialog.stories.tsx

Configure .storybook/main.ts to load stories from system/:

import type { StorybookConfig } from '@storybook/your-framework';

const config: StorybookConfig = {
  framework: '@storybook/your-framework',
  stories: ['../system/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
};

export default config;

Component Story Format (CSF)

Stories use CSF 3: a default export (meta) and named exports (stories).

Meta (default export)

import type { Meta } from '@storybook/your-framework';
import { Button } from './Button';

const meta = {
  component: Button,
  title: 'System/Button',  // optional; auto-derived from path if omitted
} satisfies Meta<typeof Button>;

export default meta;

Stories (named exports)

import type { StoryObj } from '@storybook/your-framework';

type Story = StoryObj<typeof meta>;

export const Primary: Story = {
  args: {
    label: 'Button',
    primary: true,
  },
};

export const Secondary: Story = {
  args: {
    ...Primary.args,
    primary: false,
    label: 'Secondary',
  },
};

Args map to component props. They appear in the Controls panel for live editing.

Writing stories

Basic story with args

export const Default: Story = {
  args: {
    label: 'Click me',
    disabled: false,
  },
};

Custom render

Use render when the default (component + args) is not enough:

export const InAlert: Story = {
  args: { label: 'Confirm' },
  render: (args) => (
    <Alert>
      <Button {...args} />
    </Alert>
  ),
};

Play function (interaction tests)

Simulate user interactions and assert outcomes:

import { expect } from 'storybook/test';

export const OpensDialog: Story = {
  play: async ({ canvas, userEvent }) => {
    await userEvent.click(canvas.getByRole('button', { name: 'Open' }));
    await expect(canvas.getByRole('dialog')).toBeInTheDocument();
  },
};

Decorators

Wrap stories (e.g. padding, theme, providers):

const meta = {
  component: Button,
  decorators: [
    (Story) => (
      <div style={{ padding: '3em' }}>
        <Story />
      </div>
    ),
  ],
} satisfies Meta<typeof Button>;

Parameters

Static metadata for addons (backgrounds, layout, etc.):

const meta = {
  component: Button,
  parameters: {
    backgrounds: { values: [{ name: 'dark', value: '#333' }] },
  },
} satisfies Meta<typeof Button>;

Reusing stories across components

Import story args from child components to compose parent stories:

import * as ButtonStories from '../Button/Button.stories';

export const WithButtons: Story = {
  args: {
    buttons: [
      { ...ButtonStories.Primary.args },
      { ...ButtonStories.Secondary.args },
    ],
  },
};

Configuration

main.ts

stories: Glob patterns for story files.
addons: e.g. @storybook/addon-essentials, @storybook/addon-a11y.
framework: e.g. @storybook/nextjs-vite, @storybook/react-vite.
staticDirs: Static assets (e.g. ['../public']).

preview.ts

Global decorators, parameters, and CSS:

import type { Preview } from '@storybook/react';
import '../app/globals.css';

const preview: Preview = {
  decorators: [
    (Story) => (
      <div style={{ fontFamily: 'system-ui' }}>
        <Story />
      </div>
    ),
  ],
  parameters: {
    layout: 'centered',
  },
};

export default preview;

Testing

Render tests: Every story is a smoke test — it passes if it renders without error.
Interaction tests: Use play with expect from storybook/test.
Vitest addon: npx storybook add @storybook/addon-vitest — runs stories as Vitest tests.
Accessibility: Enable @storybook/addon-a11y for automated a11y checks.
Visual testing: Use Chromatic or snapshot tests for visual regression.

Best practices

Colocate stories with components in system/<ComponentName>/.
Use args instead of hardcoding props; enables Controls and reuse.
One story per meaningful state (default, loading, error, empty, etc.).
Reuse child story args when composing parent stories.
Use play for interaction tests instead of manual E2E when possible.
Keep stories focused — one component per story file; use render for composition.

Common mistakes

Stories in separate folder: Prefer colocation (Component.stories.tsx next to Component.tsx).
Missing component in meta: Required for autodocs and Controls; use satisfies Meta<typeof Component>.
Hardcoded props: Use args so Controls work and stories are reusable.
Wrong framework import: Use @storybook/nextjs-vite, @storybook/react-vite, etc., not generic @storybook/react.
Glob not matching system/: Ensure stories in main.ts includes ../system/**/*.stories.*.

Additional resources

reference.md — Official Storybook docs links, frameworks, addons, testing.
Official: https://storybook.js.org/docs
Writing stories: https://storybook.js.org/docs/writing-stories
Testing: https://storybook.js.org/docs/writing-tests

Agent Skills: Storybook

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