storybook-story-generation

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name: storybook-story-generation description: Use after React components are built (Phase 4.5 of the Figma/Canva/screenshot pipeline) or whenever a project needs Storybook coverage — auto-generates .stories.tsx and .mdx docs from components via ts-morph AST parsing, with prop controls, variant stories, action args, and default args. Keywords: Storybook, generate stories, .stories.tsx, MDX docs, argTypes, controls, autodocs, CSF3, variant stories, action args, component documentation, story generation, ts-morph

Storybook Story Generation — AST-Based Stories + MDX Docs

Purpose

Auto-generate Storybook 8 (CSF3) stories and MDX documentation from built React components. The generator parses each component's TypeScript source with a ts-morph AST — not regex — so it can reliably extract prop types, string-literal unions, default values, callback props, and JSDoc comments, then emit:

• Component.stories.tsx — Meta with tags: ['autodocs'], prop-aware argTypes/controls, a Default story seeded with destructured defaults, one variant story per union value, True/False stories for booleans, action args for callbacks, and optional responsive-viewport stories.
• Component.mdx — an autodocs page with Meta, Canvas, Controls, and ArgTypes blocks, plus the component's JSDoc description and a Canvas per variant.

The skill wraps scripts/generate-stories.sh (a thin wrapper over scripts/generate-stories.js). It is a non-blocking step: a failure never fails the build.

When to Use

• Phase 4.5 of /build-from-figma, /build-from-canva, and /build-from-screenshot — immediately after components are built and unit tests pass, before/alongside visual QA (runs in parallel, non-blocking).
• Backfilling Storybook coverage for an existing component library.
• When the user asks to "generate Storybook stories", "add stories for these components", "create autodocs", or "document components in Storybook".

Trigger phrases:

• "Generate Storybook stories"
• "Auto-generate stories for my components"
• "Add MDX docs to Storybook"
• "Create stories with controls and variants"

Do NOT use for: hand-authored interaction/play() tests (those belong to the react-testing-workflows skill), or non-React output targets.

Inputs

• Required: Built components under src/components/**/*.tsx (override with --src-dir). Components must be exported and named with an uppercase first letter (function, arrow-const, or default export).
• Recommended: A props interface ComponentNameProps — the generator keys off this naming convention to build controls and variants.
• Optional: .claude/pipeline.config.json → storybook (thresholds and toggles; see Configuration).
• Optional: tsconfig.json — used by ts-morph when present; otherwise a sensible in-memory compiler config is used.

Process

Step 1: Read configuration

Load .claude/pipeline.config.json → storybook (falls back to defaults if the file is missing or autoGenerate is unset). Relevant keys: skipPatterns, generateMdx, maxVariantsPerProp, includeResponsiveViewports, viewports (widths resolved from visualDiff.breakpoints).

Step 2: Scan for components

Recursively walk src/components, collecting .tsx files while excluding *.test.tsx, *.stories.tsx, *.d.ts, index.tsx, and the node_modules, __tests__, and __mocks__ directories. Files matching a skipPatterns glob are skipped. Components that already have a .stories.tsx sibling are skipped unless --force is passed.

Step 3: Extract prop metadata (AST)

For each component the generator:

1. Finds the first exported uppercase component (function decl, exported const, or default export).
2. Locates its ComponentNameProps interface.
3. For each prop, records: name, optionality, control type, union options, JSDoc description, and whether it is a callback.
4. Reads default values from the parameter destructuring pattern (({ size = 'md' }) → size: 'md').

Control mapping:

Prop type	Control	Notes
string	text
number	number
boolean	boolean	also emits True/False variant stories
'a' | 'b' | 'c' (string-literal union)	select	options populated; one variant story per value
on* function (e.g. onClick)	action arg	{ action: 'clicked' } (past-tense of the event)
other / complex	text	falls back to text; adjust manually if needed

Step 4: Generate .stories.tsx

Emit CSF3 with title: 'Components/<path-relative-to-src>', tags: ['autodocs'], argTypes, a Default story (seeded with destructured defaults), variant stories (capped at maxVariantsPerProp per prop), and viewport stories when includeResponsiveViewports is enabled.

import type { Meta, StoryObj } from '@storybook/react';
import { Badge } from './Badge';

const meta: Meta<typeof Badge> = {
  title: 'Components/ui/Badge',
  component: Badge,
  tags: ['autodocs'],
  argTypes: {
    variant: { control: 'select', options: ['info', 'success', 'warning', 'error'] },
    onDismiss: { action: 'dismissed' },
  },
};
export default meta;
type Story = StoryObj<typeof Badge>;

export const Default: Story = { args: { variant: 'info' } };
export const Info: Story = { args: { variant: 'info' } };
export const Success: Story = { args: { variant: 'success' } };
// …one per union value

Step 5: Generate .mdx (unless --no-mdx or generateMdx: false)

Emit an autodocs page importing @storybook/blocks, referencing the sibling .stories, and embedding the component's JSDoc description, the Default Canvas, Controls, a Canvas per variant, and the full ArgTypes table.

import { Meta, Canvas, Controls, ArgTypes } from '@storybook/blocks';
import * as Stories from './Badge.stories';

<Meta of={Stories} />

# Badge

A status badge with semantic color variants.

<Canvas of={Stories.Default} />
<Controls of={Stories.Default} />
<Canvas of={Stories.Info} />
<ArgTypes of={Stories} />

Step 6: Run and report

./scripts/generate-stories.sh            # generate stories + MDX for all components
./scripts/generate-stories.sh --dry-run  # report what would be written, write nothing
./scripts/generate-stories.sh --force    # overwrite existing stories
./scripts/generate-stories.sh --no-mdx   # stories only, skip MDX
./scripts/generate-stories.sh --json     # machine-readable { generated, skipped, files }

Because this step is non-blocking, log the generated/skipped counts and continue the pipeline even if generation fails.

CLI Reference

Flag	Default	Effect
--src-dir <path>	src/components	Component source directory to scan
--config <path>	.claude/pipeline.config.json	Pipeline config path
--force	off	Overwrite existing .stories.tsx files
--dry-run	off	Report only; write nothing
--no-mdx	off	Skip .mdx generation
--json	off	Emit JSON (suppresses human logs)

Configuration

.claude/pipeline.config.json → storybook:

Key	Default	Purpose
autoGenerate	true	Enable/disable generation in the pipeline
includeResponsiveViewports	true	Add a viewport story per breakpoint
viewports	["mobile","tablet","desktop"]	Which breakpoints to emit (widths from visualDiff.breakpoints)
skipPatterns	["**/index.ts","**/*.test.*","**/*.stories.*"]	Globs to exclude
generateMdx	true	Emit .mdx docs alongside stories
maxVariantsPerProp	10	Cap variant stories per prop (prevents explosion)

Output

File	Purpose
src/components/**/Component.stories.tsx	CSF3 stories with controls, variants, actions
src/components/**/Component.mdx	Autodocs page (Meta/Canvas/Controls/ArgTypes)

Common Mistakes

• No controls generated. Props are declared as a type alias rather than an interface ComponentNameProps. The generator detects the type but does not yet expand its members — convert to an interface (or add controls manually).
• Component skipped. The export is lowercase, not exported, or the file is a *.test.tsx/index.tsx. Ensure the component is exported with an uppercase name.
• Stories not overwritten. Existing .stories.tsx are preserved by design; pass --force to regenerate.
• children/complex props show a text control. Non-primitive props fall back to a text control — refine argTypes by hand where richer controls matter.
• Action name looks odd. Action args derive a past-tense label from the event name (onClick → clicked, onChange → changed); rename the arg in the story if a different label reads better.

Integration

• figma-to-react-workflow skill — invokes this skill as Phase 4.5, right after components are built and unit tests pass (non-blocking, in parallel with visual QA).
• react-testing-workflows skill — owns hand-authored play()/interaction tests; this skill produces the base stories those can extend.
• parallel-orchestration skill — runs the storybook phase (depends on component-build, blocking: false) alongside visual-diff and dark-mode.
• scripts/generate-stories.sh — bash wrapper; forwards all flags to the Node generator.
• scripts/generate-stories.js — the ts-morph AST generator that does the work.
• .claude/pipeline.config.json → storybook — thresholds and toggles.

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Skill Version: 1.0.0 Last Updated: 2026-07-01