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docs: improve CLAUDE.md structure with modular rules system#598

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docs: improve CLAUDE.md structure with modular rules system#598
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@MaxLee-dev MaxLee-dev commented May 27, 2026

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Summary

  • Add root `CLAUDE.md` covering monorepo structure, workspace-wide commands, release workflow, and commit conventions
  • Rewrite `packages/core/CLAUDE.md` to focus on architecture-critical information (component patterns, rendering flow, styling system, test strategy) instead of a Gemini styleguide translation
  • Add 5 detailed rule files under `.claude/rules/` (`component-api.md`, `styling.md`, `typescript.md`, `testing.md`, `docs.md`) that Claude Code loads on demand
  • Expand `.claude/rules/typescript.md` with `React.FC` rationale, detailed `type` vs `interface` guidance, and namespace import naming convention

Why

The previous `packages/core/CLAUDE.md` was essentially a translated copy of `.gemini/styleguide.md` — it mixed generic coding conventions with package-specific rules, had no root-level CLAUDE.md, and lacked the architectural context Claude Code needs most (compound component patterns, RSC-safe export structure, Vanilla Extract styling primitives). This led to repeated mistakes such as using `Object.assign` for compound exports, hard-coded style values, and incorrect prop types.

The new structure separates concerns:

  • `CLAUDE.md` (root) → monorepo overview, commands, conventions
  • `packages/core/CLAUDE.md` → architecture overview + pointers to rule files
  • `.claude/rules/*.md` → deep-dive rules loaded only when relevant, keeping context window usage efficient

Key decisions documented

  • No `Object.assign` for compound exports: `Object.assign` in `index.ts` forces a direct reference to implementation files, collapsing the RSC `'use client'` boundary. The 3-file pattern (`index.ts` → `index.parts.ts` → `component.tsx`) keeps the entrypoint free of client directives.
  • Storybook `TestBed` story: serves as the visual regression baseline for Playwright — must remain stable and represent all variant combinations.
  • Rendering flow: `resolveStyles` → `cn(recipe, className)` → `` is the invariant pattern every component follows.
  • No `React.FC`: implicitly adds `children?: ReactNode` to all components regardless of intent, breaks with `defaultProps`, doesn't support generics, and was removed from the CRA TypeScript template in React 18. Use plain function with an explicit props interface instead.
  • `interface` over `type` for props: `type &` intersection silently produces `never` for conflicting property types and only surfaces the error at the use site; `interface extends` catches the conflict at definition time. `interface` is also faster for the TypeScript compiler when inheritance is involved.

Summary by CodeRabbit

Release Notes

  • Documentation
    • Added detailed guidance for the core component package, covering component API structure, import/export conventions, Vanilla Extract styling flow, testing expectations, and TypeScript/style rules.
    • Updated broader repo and workspace documentation, including component docs generation via Storybook autodocs and the preferred visual regression baseline.
  • Chores
    • Updated the website workspace development environment versions (package manager and Node.js).

MaxLee-dev and others added 2 commits May 26, 2026 15:16
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
@MaxLee-dev MaxLee-dev requested a review from noahchoii as a code owner May 27, 2026 08:53
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vapor-ui Ready Ready Preview, Comment Jul 13, 2026 5:16am

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⚠️ No Changeset found

Latest commit: 26f6ada

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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Review Change Stack

No actionable comments were generated in the recent review. 🎉

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📒 Files selected for processing (1)
  • .claude/rules/typescript.md

📝 Walkthrough

Walkthrough

This pull request adds repository and package-specific Claude Code guidance, covering component APIs, Vanilla Extract styling, testing, TypeScript conventions, Storybook documentation, development workflows, and environment versions.

Changes

Component Development Standards for @vapor-ui/core

Layer / File(s) Summary
Repository and Package Context
CLAUDE.md, packages/core/CLAUDE.md
Documents monorepo structure, development commands, Changesets, Conventional Commits, package architecture, styling, testing, aliases, and Rollup outputs.
Component API and Architecture
.claude/rules/component-api.md
Defines component structure, exports, compound component entrypoints, prop typing, Base UI composition, accessibility, controlled behavior, and public API examples.
Vanilla Extract Styling Conventions
.claude/rules/styling.md
Documents style resolution, Vanilla Extract primitives, variant handling, CSS variables, state selectors, design tokens, $css, and cascade ordering.
Testing Conventions and Coverage
.claude/rules/testing.md
Establishes interaction, focus, lifecycle, controlled/uncontrolled, accessibility, fake-timer, and test-colocation conventions.
TypeScript and Code Style Conventions
.claude/rules/typescript.md
Defines target paths, naming, React props, interface/type usage, null handling, array syntax, and enum/constant conventions.
Documentation and Storybook Patterns
.claude/rules/docs.md
Specifies Storybook autodocs, Test Bed visual regression usage, and colocated stories.
Environment Version Updates
apps/website/CLAUDE.md
Updates required versions to pnpm 10.33.4 and Node.js 20.20.2+.

Estimated code review effort: 2 (Simple) | ~12 minutes

Possibly related PRs

🚥 Pre-merge checks | ✅ 4
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title accurately summarizes the documentation restructuring and modular rules added to CLAUDE.md files.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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  • Commit unit tests in branch improve-claude-md

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Actionable comments posted: 7

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.claude/rules/component-api.md:
- Around line 14-21: The fenced code block showing the component folder
structure is missing a language tag and triggers markdownlint MD040; update the
block in component-api.md (the block with the lines listing
src/components/button/ etc.) to include a language identifier (for example use
```text or ```bash) immediately after the opening backticks so the fence is
labeled and MD040 is resolved.

In @.claude/rules/docs.md:
- Around line 16-20: The fenced code block showing the folder structure (the
block containing "src/components/button/" and its files) is unlabeled which
triggers markdownlint MD040; fix it by adding a language label after the opening
backticks (e.g., use "text" or "bash") so the block becomes a labeled fenced
code block and the lint rule is satisfied.

In @.claude/rules/styling.md:
- Around line 16-25: The markdown fenced code blocks shown (the block containing
the snippets for resolveStyles, cn, and BaseComponent) are missing language
tags; update those fenced blocks by adding an explicit language label (e.g.,
```text or ```markdown) so they pass MD040 linting—specifically edit the block
that documents resolveStyles, cn, and <BaseComponent .../> and the similar block
around lines 193–199 to prepend the appropriate language identifier.

In @.claude/rules/testing.md:
- Around line 66-70: The fenced code block showing the file tree
("src/components/button/" with "button.tsx" and "button.test.tsx") is missing a
language tag which triggers MD040; update the opening fence from ``` to include
a language (e.g., ```text or ```bash) so the block is language-qualified; ensure
the same fence content (the file tree) remains unchanged and commit the markdown
edit.

In `@CLAUDE.md`:
- Around line 88-90: Update the fenced code block containing "<type>(<scope>):
<subject>" to specify a language for markdownlint (MD040); change the opening
fence from ``` to ```text so the block reads as a text code block and resolves
the linter warning.

In `@packages/core/CLAUDE.md`:
- Around line 27-34: Several fenced code blocks in the CLAUDE.md file are
missing language identifiers (e.g., the block that starts with
"src/components/button/"); update each unlabeled fenced block by adding an
appropriate language tag (for example use ```text or ```bash for file
trees/terminal snippets, or ```tsx/```tsx for React code) so that the blocks
that contain the "src/components/button/" listing and the other unlabeled blocks
are annotated with the correct language identifier.
- Around line 15-19: Update the malformed rule file paths in CLAUDE.md by
replacing the incorrect `@.claude/...` prefixes with the repo-conventional
`.claude/...` versions (e.g. change `@.claude/rules/component-api.md`,
`@.claude/rules/styling.md`, `@.claude/rules/typescript.md`,
`@.claude/rules/testing.md`, `@.claude/rules/docs.md` to
`.claude/rules/component-api.md`, `.claude/rules/styling.md`,
`.claude/rules/typescript.md`, `.claude/rules/testing.md`,
`.claude/rules/docs.md`) so the links match the actual `.claude/rules/`
directory at the repo root.
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Fix all unresolved CodeRabbit comments on this PR:

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📥 Commits

Reviewing files that changed from the base of the PR and between 7d4732c and 29eba5b.

📒 Files selected for processing (7)
  • .claude/rules/component-api.md
  • .claude/rules/docs.md
  • .claude/rules/styling.md
  • .claude/rules/testing.md
  • .claude/rules/typescript.md
  • CLAUDE.md
  • packages/core/CLAUDE.md

Comment thread .claude/rules/component-api.md Outdated
Comment thread .claude/rules/docs.md Outdated
Comment thread .claude/rules/styling.md Outdated
Comment thread .claude/rules/testing.md Outdated
Comment thread CLAUDE.md Outdated
Comment thread packages/core/CLAUDE.md
Comment thread packages/core/CLAUDE.md Outdated
@vapor-ui

vapor-ui commented May 27, 2026

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All tests passed!

Tests Passed Failed Duration Report
156 156 0 1m 5s Open report ↗︎

Click here if you need to update snapshots.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Add language tags to fenced code blocks (MD040) across CLAUDE.md and
.claude/rules/* files.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
… interface detail

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
MaxLee-dev and others added 2 commits June 17, 2026 16:49
- unify @vapor-ui/core component count (34+ → 40+) across root and core
- soften axe coverage claims to "required for new, backfilling existing"
- update website toolchain versions to match root packageManager/.nvmrc
- document Dialog layout-convenience parts (Header/Body/Footer)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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👍

Comment thread .claude/rules/typescript.md Outdated
Comment on lines +97 to +101
Constants use `CONSTANT_CASE` with `as const`:

```ts
const MAX_RETRY_COUNT = 3 as const;
```

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What do you think about applying as const only when the constant is an object type? Since primitive values already have sufficiently narrowed types, it feels like we don’t really need to specify as const for them!

Comment thread .claude/rules/typescript.md Outdated
Comment on lines +103 to +112
## Imports

Namespace import aliases use `lowerCamelCase`:

```ts
// ✅
import * as fooBar from './foo-bar';
// ❌
import * as FooBar from './foo-bar';
```

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Since there are cases where components are imported using a namespace pattern, how about removing this convention?

Comment thread .claude/rules/typescript.md Outdated
import * as FooBar from './foo-bar';
```

## Coding Style

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This seems to be related to code conventions—is there a particular reason you added it to the typescript.md document?

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It seems this was already in the TypeScript section when I was moving this over. Since it didn't seem necessary for this particular typescript.md file, I deleted it.!

- as const는 객체 상수에만 적용 (primitive는 이미 리터럴 타입으로 추론됨)
- namespace import lowerCamelCase 규칙 제거 (React, Dialog 등 PascalCase 관례와 모순)
- Coding Style 섹션 제거 (포매팅은 Prettier가 강제)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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3 participants