Purpose

Enforce code quality and consistency standards across the entire codebase through automated checks.

What it checks (19 checks, each with its own script):

1. Path alias usage (no relative imports to aliased dirs)
2. Export patterns (no default exports, no index files)
3. Redux abstraction (components use hooks, not direct Redux)
4. Service isolation (dependency injection pattern)
5. i18n coverage (all UI text wrapped in t())
6. Type safety (no "any" type)
7. No linter/TypeScript suppressions
8. No god files (1 entity per file)
9. No TODO/FIXME/HACK comments
10. No console usage (use loglevel instead)
11. Redux saga patterns (efficient parallelism)
12. No type assertions (no "as const", no "satisfies")
13. No re-exports (import directly from source)
14. No "type" keyword in imports (plain imports only)
15. No dangerouslySetInnerHTML (XSS vulnerability)
16. React key patterns (no array index as key, no missing keys)
17. No magic numbers (use named constants)
18. TypeScript strict mode enabled (tsconfig.json)
19. Dependency array patterns (useEffect, useMemo, useCallback)

What it doesn't check:

• Feature dependency rules (core → domain) - see arch-audit skill

Architecture Context

This template uses a core/domain separation:

• core/features/* - Infrastructure features (app, i18n, router, slice-manager, ui, auth, components, layout)
• domain/features/* - Business features (wallet, oauth, blog-demo, ai-assistant, site)

Both follow the same patterns and rules. New features you create will be domain features.

Running Checks

All checks:

node ./.claude/skills/code-audit/scripts/run_all_checks.mjs

Generate report:

node ./.claude/skills/code-audit/scripts/generate_report.mjs

Individual checks:

node ./.claude/skills/code-audit/scripts/check_imports.mjs
node ./.claude/skills/code-audit/scripts/check_exports.mjs
node ./.claude/skills/code-audit/scripts/check_redux_abstraction.mjs
node ./.claude/skills/code-audit/scripts/check_service_imports.mjs
node ./.claude/skills/code-audit/scripts/check_i18n_coverage.mjs
node ./.claude/skills/code-audit/scripts/check_any_usage.mjs
node ./.claude/skills/code-audit/scripts/check_suppressions.mjs
node ./.claude/skills/code-audit/scripts/check_god_files.mjs
node ./.claude/skills/code-audit/scripts/check_todos.mjs
node ./.claude/skills/code-audit/scripts/check_logs.mjs
node ./.claude/skills/code-audit/scripts/check_saga_patterns.mjs
node ./.claude/skills/code-audit/scripts/check_type_assertions.mjs
node ./.claude/skills/code-audit/scripts/check_reexports.mjs
node ./.claude/skills/code-audit/scripts/check_type_imports.mjs
node ./.claude/skills/code-audit/scripts/check_dangerous_html.mjs
node ./.claude/skills/code-audit/scripts/check_react_keys.mjs
node ./.claude/skills/code-audit/scripts/check_magic_numbers.mjs
node ./.claude/skills/code-audit/scripts/check_strict_mode.mjs
node ./.claude/skills/code-audit/scripts/check_dep_arrays.mjs

Quality Rules

1. Path Alias Imports

RULE: Use absolute path aliases (@/features/*, @/services/*, etc.) instead of relative imports when crossing directory boundaries.

Why: Makes imports clear, prevents broken paths when moving files, enables IDE navigation.

Allowed:

• ✅ Internal imports within same feature: ./slice.ts, ../models/session/actions.ts
• ✅ Imports within same service/page/hook directory

Violations:

• ❌ import { useAuth } from '../../features/oauth/hooks/useAuth'
• ❌ import { api } from '../services/api'

Fix:

• ✅ import { useAuth } from '@/core/features/oauth/hooks/useAuth'
• ✅ import { api } from '@/services/api'

---

2. Export Patterns

RULE: Use named exports only. No default exports, no index.ts barrel files.

Why: Makes refactoring safer, imports explicit, no ambiguity.

Violations:

• ❌ export default function MyComponent() { ... }
• ❌ index.ts files that re-export from other files

Fix:

• ✅ export const MyComponent: React.FC = () => { ... }
• ✅ Import directly from source file

Exceptions:

• Storybook files (*.stories.tsx) - require default exports
• Type definition files (*.d.ts) - may use default

---

3. Redux Abstraction

RULE: Components NEVER import useDispatch, useSelector, or RootState directly. They use feature hooks.

Why: Abstracts Redux implementation, components don't know about state management.

Pattern:

Components → Feature Hooks → Redux
(NEVER: Components → Redux directly)

Violations:

• ❌ Component imports useDispatch from react-redux
• ❌ Component imports RootState
• ❌ Component uses useSelector

Fix:

• ✅ Use feature action hooks: useWalletActions(), useBlogActions()
• ✅ Use feature state hooks: useWallet(), useAuth()
• ✅ Use useTypedSelector from @/hooks/useTypedSelector for cross-feature state

Allowed files (these ARE the abstraction layer):

• (core|domain)/features/*/hooks/*.ts - can use useDispatch, useSelector, RootState
• src/hooks/*.ts - can use useSelector, RootState
• (core|domain)/features/*/models/*/actionEffects/*.ts - can use RootState

---

4. Service Import Boundaries

RULE: Services (@/services/*) are ONLY imported in composition root (src/config/(core|domain)/*/services.ts).

Why: Dependency injection pattern - features receive services through interfaces, easy to swap implementations.

Violations:

• ❌ Feature imports @/services/ethersV6/wallet/WalletAPI
• ❌ Page imports @/services/oauth/OAuthService

Fix:

• ✅ Feature defines IFeatureApi interface
• ✅ Service instantiated in src/config/(core|domain)/{feature}/services.ts
• ✅ Feature receives service through interface

Allowed files:

• src/config/services.ts (root composition, if exists)
• src/config/(core|domain)/*/services.ts (feature-specific composition)

---

5. i18n Coverage

RULE: All user-facing text must be wrapped in t() function for translation.

Why: Enables multi-language support, i18next tooling extracts text.

Violations:

• ❌ <Button>Click me</Button>
• ❌ const message = "Error occurred"

Fix:

• ✅ <Button>{t('Click me')}</Button>
• ✅ const message = t('Error occurred')

Excluded (not user-facing):

• Log statements: log.debug('...'), console.log('...')
• HTML attributes: className, id, href, src
• CSS values, variable names, paths
• Infrastructure files (main.tsx, error boundaries, debug panels)

Exception paths (developer tools, not user UI):

• core/features/slice-manager/components/SliceDebugPanel
• core/features/i18n/components/LangMenu/LangModal
• domain/layout/ErrorFallback
• OAuth callback handlers

---

6. TypeScript "any" Type

RULE: Never use any type. Use proper types, generics, or unknown.

Why: Defeats TypeScript's type safety, allows runtime errors.

Violations:

• ❌ function process(data: any) { ... }
• ❌ const items: any[] = [...]

Fix:

• ✅ Define proper interfaces/types
• ✅ Use generics: <T> for reusable code
• ✅ Use unknown for truly dynamic types (forces type guards)

Exceptions:

• Type definition files (*.d.ts) for external libraries
• Test files (*.test.ts) for mocking (prefer typed mocks)

---

7. Linter/TypeScript Suppressions

RULE: Never suppress errors with comments. Fix the underlying issue.

Why: Suppressions hide real bugs, accumulate technical debt.

Violations:

• ❌ // @ts-ignore
• ❌ // @ts-nocheck
• ❌ // eslint-disable
• ❌ // prettier-ignore

Fix: Address the root cause, don't hide it.

Exceptions:

• Test files may have legitimate suppressions
• If absolutely necessary, use @ts-expect-error (fails if error is fixed) with detailed comment

---

8. God Files (1 Entity Per File)

RULE: Each file exports exactly ONE entity (interface, type, class, enum). File name matches entity name.

Why: Easy to find, clear purpose, follows Single Responsibility Principle.

Violations:

• ❌ File with multiple export interface declarations
• ❌ File with multiple export type declarations

Fix: Split into separate files.

Examples:

• UserService.ts → export class UserService
• FeatureConfig.ts → export interface FeatureConfig
• ConnectionState.ts → export type ConnectionState

Exceptions:

• Test files (*.test.ts, *.spec.ts)
• Type definitions (*.d.ts) for external libraries
• Storybook files (*.stories.tsx)
• React component files with props interfaces (e.g., Breadcrumb.tsx can have BreadcrumbProps)
• Specific exception paths (see script for list)

---

9. TODO/FIXME/HACK Comments

RULE: No technical debt markers in code. Track work in issue tracker instead.

Why: Markers indicate incomplete work, forgotten tasks, or known bugs.

Detected:

• TODO, FIXME, HACK, XXX, BUG

Fix: Create GitHub issues, complete work, remove comments.

---

10. Console Usage

RULE: No console.* statements in production code. Use log.* from loglevel.

Why: Console statements can't be controlled in production, expose debug info.

Violations:

• ❌ console.log(), console.error(), console.warn()

Fix:

• ✅ log.debug() - auto-disabled in production
• ✅ log.info(), log.warn(), log.error() - controlled log levels

---

11. Redux Saga Patterns

RULE: Use single yield all([...]) for parallel operations. Multiple yield all in same function is inefficient.

Why: True parallelism requires combining effects into one yield all.

Violation:

yield all([effect1, effect2]);
yield all([effect3, effect4]); // Sequential, not parallel!

Fix:

yield all([effect1, effect2, effect3, effect4]); // Truly parallel

---

12. No Type Assertions

RULE: Never use as const or satisfies. Use proper types, interfaces, or enums instead.

Why: Type assertions are shortcuts that reduce code clarity, reusability, and maintainability. Proper type definitions are self-documenting and enforce better architecture.

Violations:

• ❌ const colors = ["red", "blue"] as const
• ❌ const config = { ... } satisfies Config
• ❌ const options = { mode: "light" } as const

Fix:

• ✅ Define proper types:

  type Color = "red" | "blue";
  const colors: Color[] = ["red", "blue"];
  

• ✅ Use explicit type annotations:

  const config: Config = { ... };
  

• ✅ Use enums for constant sets:

  enum Mode {
    Light = "light",
    Dark = "dark"
  }
  const options = { mode: Mode.Light };
  

Why This Matters:

• as const and satisfies are lazy shortcuts
• They bypass proper type definition and reusability
• Makes code harder to understand and maintain
• Prevents type reuse across the codebase
• Reduces IDE autocomplete effectiveness

Better alternatives:

• interface for object shapes
• type for unions, intersections, and aliases
• enum for constant sets of values
• const with explicit type annotations
• Proper TypeScript types that are reusable and self-documenting

---

13. No Re-exports

RULE: Never use re-export statements. Import directly from source files instead of re-exporting from intermediate files.

Why: Re-exports create indirection, make code harder to navigate, and obscure actual dependencies. Direct imports make the codebase more transparent and easier to refactor.

Violations:

• ❌ export { Something } from './somewhere'
• ❌ export * from './somewhere'
• ❌ export * as namespace from './somewhere'
• ❌ export type { TypeName } from './somewhere'
• ❌ Index files that re-export: index.ts with re-exports

Fix:

• ✅ Import directly from source files:

  // Instead of re-exporting in index.ts
  // ❌ export { UserService } from './UserService';
  
  // Import directly from source
  // ✅ import { UserService } from './path/to/UserService';
  

Why This Matters:

• Re-exports create unnecessary layers of indirection
• Makes it harder to find where code is actually defined
• IDE "Go to Definition" jumps to re-export, not actual source
• Refactoring becomes harder (must update re-export files)
• Violates "import from source" principle

The Rule:

• Import directly from the file where entity is defined
• No barrel files (index.ts with re-exports)
• No re-export statements anywhere in codebase

---

14. No "type" Keyword in Imports

RULE: Never use the type keyword in import statements. TypeScript automatically removes type-only imports during compilation.

Why: The type keyword is redundant visual noise. TypeScript's compiler can automatically detect and remove type-only imports without the keyword, making code cleaner and simpler.

Violations:

• ❌ import type { User } from './types'
• ❌ import { type User } from './types'
• ❌ import { Data, type User } from './types' (mixed)

Fix:

• ✅ Plain imports for everything:

  import { User, Data } from './types';
  

Why This Matters:

• type keyword adds visual clutter without benefit
• TypeScript compiler handles type erasure automatically
• Simpler, cleaner import statements
• Consistent import style across entire codebase
• One less thing to think about when writing imports

The Rule:

• Always use plain import syntax
• Let TypeScript handle type-only import optimization
• No import type { X }
• No import { type X }
• Just use import { X }

---

15. No dangerouslySetInnerHTML

RULE: Never use dangerouslySetInnerHTML - it bypasses React's XSS protection.

Why: Opens XSS vulnerabilities, allows arbitrary HTML injection, user-controlled content can execute malicious scripts.

Violations:

• ❌ <div dangerouslySetInnerHTML={{ __html: userContent }} />
• ❌ Any use of dangerouslySetInnerHTML prop

Fix:

• ✅ Use React's default rendering (auto-escapes):

  <div>{content}</div>
  

• ✅ If HTML rendering is absolutely required, sanitize first:

  import DOMPurify from 'dompurify';
  <div dangerouslySetInnerHTML={{ __html: DOMPurify.sanitize(content) }} />
  

Why This Matters:

• React automatically escapes all content by default (XSS protection)
• dangerouslySetInnerHTML bypasses this protection
• Critical security vulnerability if user input is rendered
• Name literally says "dangerous" for a reason

The Rule:

• Avoid dangerouslySetInnerHTML entirely if possible
• If absolutely necessary, sanitize with DOMPurify
• Never use with user-controlled content without sanitization

---

16. React Key Patterns

RULE: Always use stable, unique identifiers as keys in lists. Never use array index or omit keys.

Why: Using array index as key causes bugs when list order changes. Missing keys cause React warnings and unpredictable re-renders.

Violations:

• ❌ Array index as key:

  items.map((item, index) => <Item key={index} />)
  

• ❌ Missing key entirely:

  items.map(item => <Item {...item} />)
  

Fix:

• ✅ Use stable unique identifier from data:

  items.map(item => <Item key={item.id} {...item} />)
  

Why This Matters:

• Index as key: When list order changes (sort, filter, reorder), React cannot track which element is which
• Leads to wrong elements being re-rendered or updated
• Can cause state to be attached to wrong elements
• Performance issues from unnecessary re-renders
• Missing key: React shows warnings, unpredictable behavior, poor reconciliation

The Rule:

• Always provide a key prop when rendering lists with .map()
• Use a stable, unique identifier (usually item.id)
• Never use array index as key
• Key must be unique among siblings

---

17. No Magic Numbers

RULE: Never use magic numbers - use named constants instead.

Why: Magic numbers make code harder to understand, difficult to maintain and update, no semantic meaning without context.

Focus: Time-related values (setTimeout, setInterval, delays)

Violations:

• ❌ Magic number in setTimeout:

  setTimeout(callback, 3600000); // What is 3600000?
  

• ❌ Magic number in delay/retry logic:

  await delay(5000); // 5000 what?
  

Fix:

• ✅ Named constant:

  const ONE_HOUR_MS = 3600000;
  setTimeout(callback, ONE_HOUR_MS);
  
  const FIVE_SECONDS_MS = 5000;
  await delay(FIVE_SECONDS_MS);
  

Why This Matters:

• Self-documenting code
• Easy to find and update all usages
• Clear intent and meaning
• Prevents errors from typos
• Easier maintenance

Detection Focus:

• setTimeout/setInterval with values >= 1000ms (1 second)
• Delay/wait/retry functions with large values
• Config files are exempted (often contain configuration numbers)

The Rule:

• Use named constants for time values
• Format: {VALUE}_{UNIT}_MS (e.g., ONE_HOUR_MS, 30_SECONDS_MS)
• Exception: Very small, obvious values (e.g., setTimeout(fn, 0))

---

18. TypeScript Strict Mode

RULE: TypeScript's strict mode must be enabled in tsconfig.json.

Why: Enables 8+ critical type safety checks, catches errors at compile time, industry best practice.

Violation:

• ❌ tsconfig.json missing "strict": true
• ❌ "strict": false in compilerOptions
• ❌ No compilerOptions in tsconfig.json

Fix:

• ✅ In tsconfig.json, add or update:

  {
    "compilerOptions": {
      "strict": true
    }
  }
  

What Strict Mode Includes:

1. noImplicitAny - Prevents implicit "any" types
2. noImplicitThis - Requires explicit "this" typing
3. alwaysStrict - ECMAScript strict mode in all files
4. strictBindCallApply - Validates call/bind/apply arguments
5. strictNullChecks - Enforces null/undefined checking
6. strictFunctionTypes - Stricter function type checking
7. strictPropertyInitialization - Ensures class properties are initialized
8. useUnknownInCatchVariables - Catch variables are "unknown" not "any"

Why This Matters:

• Catches type errors at compile time instead of runtime
• Better IDE autocomplete and intellisense
• Self-documenting code with explicit types
• Easier refactoring with type safety
• Industry best practice for professional TypeScript projects

The Rule:

• Always enable "strict": true in tsconfig.json
• Required for production-ready TypeScript code
• Cannot be disabled or set to false

---

19. React Hook Dependency Arrays

RULE: Dependency arrays must be correct - no missing reactive values, no stable values, no side effects in memoization hooks.

Why: Incorrect dependency arrays cause stale closures, unnecessary re-renders, memory leaks, and bugs that are hard to debug.

5 Sub-Checks:

CHECK 1: Missing Dependencies (HIGH)

Empty [] but reactive values are used inside - will cause stale closures.

Violations:

• ❌ Using i18n.resolvedLanguage with empty array:

  useEffect(() => {
    actions.fetchPosts({ language: i18n.resolvedLanguage });
  }, []); // i18n.resolvedLanguage is used but not in deps!
  

Fix:

• ✅ Add reactive values to dependency array:

  useEffect(() => {
    actions.fetchPosts({ language: i18n.resolvedLanguage });
  }, [i18n.resolvedLanguage]); // Will re-run when language changes
  

Reactive Patterns Detected:

• i18n.resolvedLanguage, i18n.language (language changes)
• props.* (prop access)

Note: t function is stable and should NOT be in deps. If you need to react to language changes, use i18n.resolvedLanguage.

CHECK 2: Stable Values in Dependencies (HIGH)

These values are guaranteed stable by React/libraries and should NOT be in dependency arrays.

Violations:

• ❌ Stable values in deps:

  useEffect(() => {
    navigate('/home');
  }, [isAuthenticated, navigate]); // navigate is stable!
  

Fix:

• ✅ Remove stable values:

  useEffect(() => {
    navigate('/home');
  }, [isAuthenticated]); // Only reactive values
  

Known Stable Values:

• useState setters: setX, setState, etc.
• useReducer dispatch
• useNavigate() from react-router: navigate
• useTranslation() from i18next: t
• Redux dispatch: dispatch
• Custom action hooks: actions (from useActions())
• Route hooks: pageLink, homeRoute, pageRoutes
• Refs: any variable ending with Ref

CHECK 3: Side Effects in useMemo/useCallback (HIGH)

These hooks must be PURE - no side effects allowed.

Violations:

• ❌ Fetch in useMemo:

  const data = useMemo(() => {
    fetch('/api/data'); // WRONG! Side effect in useMemo
    return processData();
  }, [deps]);
  

• ❌ Console.log in useCallback:

  const handler = useCallback(() => {
    console.log('clicked'); // Side effect
    doSomething();
  }, []);
  

Fix:

• ✅ Move side effects to useEffect or Redux Saga:

  // useMemo should be pure
  const processed = useMemo(() => processData(rawData), [rawData]);
  
  // Side effects go in useEffect
  useEffect(() => {
    fetch('/api/data').then(setData);
  }, []);
  

Side Effects Detected:

• fetch(), axios.* calls
• console.log/warn/error/info
• localStorage.*, sessionStorage.*
• document.*, window.location

CHECK 4: Over-specified Arrays (WARNING)

4+ dependencies may indicate over-specification or a need to refactor.

Warning:

• ⚠️ 4+ deps:

  useEffect(() => {
    // Complex logic
  }, [a, b, c, d, e]); // Too many deps - review
  

Fix:

• Consider extracting logic to a custom hook
• Consider using useReducer for complex state
• Review if all deps are truly needed

CHECK 5: Direct Fetch in useEffect (INFO)

Direct API calls in useEffect miss caching, deduplication, and proper error handling.

Info:

• ℹ️ Direct fetch detected:

  useEffect(() => {
    fetch('/api/users').then(setUsers); // Direct fetch
  }, []);
  

Consider:

• React Query or SWR for data fetching
• Redux Saga for side effects (project pattern)

Note: actions.fetchX() via Redux Saga is OK - it triggers saga, not direct API call.

Why Avoid Direct Fetch:

• No automatic caching or deduplication
• Race conditions on fast navigation
• No automatic retry on failure
• Manual loading/error state management
• No SSR/SSG support

---

Output Format

Each check reports:

• File path and line number
• Violation description
• Suggested fix
• Count of total violations

Reports are saved to reports/{date}/code-audit-report.md when using generate_report.mjs.

Tools

• Bash: Run Node.js scripts
• Read: Inspect source files
• Write: Generate reports (optional)

Safety

• Read-only operation (unless generating reports)
• No source file modifications
• No external network calls
• Comprehensive scan of entire src/ directory