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programmatic JSX/TSX linting for AI code generation","maintainers":[{"name":"daniel1234567890","email":"dchen0@pm.me"}],"readme":"# laint\n\nAI Agent Lint Rules SDK - a simple programmatic API for linting JSX/TSX code.\n\n## Claude Code Integration\n\nThe fastest way to use laint is as a [Claude Code hook](https://docs.anthropic.com/en/docs/claude-code/hooks). After every file edit, Claude sees lint violations and fixes them automatically.\n\n```bash\nnpx laint init\n```\n\nThis writes a `.claude/settings.json` with a `PostToolUse` hook that runs after every `Edit` and `Write` tool call. If the file already exists, it merges without clobbering your other settings.\n\n### Configuring Rules\n\nBy default, all 45 rules run. To customize, create a `laint.config.json` in your project root:\n\n```json\n// Only run these specific rules (include mode)\n{ \"rules\": [\"no-relative-paths\", \"expo-image-import\", \"fetch-response-ok-check\"] }\n```\n\n```json\n// Run all rules except these (exclude mode)\n{ \"rules\": [\"no-tailwind-animation-classes\", \"no-stylesheet-create\"], \"exclude\": true }\n```\n\n```json\n// Run all rules for a platform (platform mode)\n{ \"platform\": \"expo\" }\n```\n\n**Platforms:** `expo`, `web`, `backend`. Platform mode runs all rules tagged for that platform plus universal rules (rules not specific to any platform).\n\n### CLI\n\n```bash\n# Lint a file directly\nnpx laint check src/components/Button.tsx\n\n# Hook mode (used by Claude Code automatically — reads stdin JSON)\nnpx laint check --hook\n```\n\n**Exit codes:**\n\n- `0` — clean (no violations)\n- `1` — violations found (file mode)\n- `2` — violations found (hook mode, stderr output for Claude)\n\n## Installation\n\n```bash\nnpm install laint\n```\n\n## Programmatic Usage\n\n```typescript\nimport { lintJsxCode, getAllRuleNames } from 'laint';\n\nconst code = `\n Profile\n ;\n}\n\n// Good - has \"use client\" directive\n('use client');\n\nimport { useState } from 'react';\n\nexport function Counter() {\n const [count, setCount] = useState(0);\n return ;\n}\n```\n\n### `no-server-import-in-client`\n\n```tsx\n// Bad - server-only module in client file\n'use client';\n\nimport { cookies } from 'next/headers';\n\nexport function UserMenu() {\n return
Menu
;\n}\n\n// Good - use server-only modules only in server components\nimport { cookies } from 'next/headers';\n\nexport function UserMenu() {\n const session = cookies().get('session');\n return
Menu
;\n}\n```\n\n### `no-complex-jsx-expressions`\n\n```jsx\n// Bad - IIFE in JSX\n
\n {(() => {\n const x = compute();\n return x;\n })()}\n
;\n\n// Good - extract to variable\nconst computedValue = compute();\n
{computedValue}
;\n```\n\n### `no-tailwind-animation-classes`\n\n```jsx\n// Bad - CSS animation classes have issues\n
\n\n// Good - use style jsx global for animations\n\n
\n```\n\n### `transition-worklet-directive`\n\n```jsx\n// Bad - missing worklet directive\nconst options = {\n screenStyleInterpolator: (progress) => {\n return { opacity: progress };\n },\n};\n\n// Good\nconst options = {\n screenStyleInterpolator: (progress) => {\n 'worklet';\n return { opacity: progress };\n },\n};\n```\n\n### `transition-progress-range`\n\n```jsx\n// Bad - only covers [0, 1], missing exit phase\nscreenStyleInterpolator: (progress) => {\n 'worklet';\n const opacity = interpolate(progress, [0, 1], [0, 1]);\n return { opacity };\n};\n\n// Good - covers full [0, 1, 2] range\nscreenStyleInterpolator: (progress) => {\n 'worklet';\n const opacity = interpolate(progress, [0, 1, 2], [0, 1, 0]);\n return { opacity };\n};\n```\n\n### `transition-gesture-scrollview`\n\n```jsx\n// Bad - regular ScrollView conflicts with transition gestures\nimport { Transition } from 'react-native-screen-transitions';\nimport { ScrollView } from 'react-native';\n...;\n\n// Good\nimport { Transition } from 'react-native-screen-transitions';\n...;\n```\n\n### `transition-shared-tag-mismatch`\n\n```jsx\n// Bad - Pressable tag has no matching View\n\n \n\n\n// Good - matching tags on both components\n\n \n\n\n \n\n```\n\n### `transition-prefer-blank-stack`\n\n```jsx\n// Bad - enableTransitions on Native Stack has edge cases\n;\n\n// Good - use Blank Stack from react-native-screen-transitions\nimport { BlankStack } from 'react-native-screen-transitions';\n```\n\n### `sql-no-nested-calls`\n\n```typescript\n// Bad - nested sql causes issues\nsql`UPDATE users SET ${sql`name = ${name}`} WHERE id = ${id}`;\n\n// Good - build query properly\nsql`UPDATE users SET name = ${name} WHERE id = ${id}`;\n```\n\n### `prefer-guard-clauses`\n\n```typescript\n// Bad - entire function body wrapped in if\nfunction handleClick(user) {\n if (user) {\n doSomething();\n doMore();\n }\n}\n\n// Good - early return\nfunction handleClick(user) {\n if (!user) return;\n doSomething();\n doMore();\n}\n```\n\n### `no-type-assertion`\n\n```typescript\n// Bad - type casting\nconst value = data as string;\nconst user = response.data as User;\n\n// Good - type narrowing\nif (typeof data === 'string') {\n const value = data;\n}\n\n// Good - proper typing\nconst user: User = response.data;\n```\n\n### `no-loose-equality`\n\n```typescript\n// Bad - loose equality\nif (a == b) {\n}\nif (x != 'hello') {\n}\n\n// Good - strict equality\nif (a === b) {\n}\nif (x !== 'hello') {\n}\n\n// OK - == null is idiomatic for null/undefined check\nif (value == null) {\n}\n```\n\n### `no-magic-env-strings`\n\n````typescript\n// Bad - hardcoded env string\nconst key = process.env.API_KEY;\nconst url = process.env['DATABASE_URL'];\n\n// Good - use centralized enum\nconst key = process.env[EnvVars.API_KEY];\n\n### `url-params-must-encode`\n\n```typescript\n// Bad - unencoded query param\nconst url = `https://api.example.com?q=${query}`;\n\n// Good - encoded query param\nconst url = `https://api.example.com?q=${encodeURIComponent(query)}`;\n````\n\n### `catch-must-log-to-sentry`\n\n```typescript\n// Bad - logs error but no Sentry\ntry {\n fetchData();\n} catch (error) {\n logger.error('Failed', error);\n}\n\n// Good - both logging and Sentry\ntry {\n fetchData();\n} catch (error) {\n logger.error('Failed', error);\n Sentry.captureException(error);\n}\n```\n\n### `no-nested-try-catch`\n\n```typescript\n// Bad - nested try-catch\ntry {\n try {\n inner();\n } catch (e) {}\n} catch (e) {}\n\n// Good - extract to separate function\nfunction safeInner() {\n try {\n inner();\n } catch (e) {}\n}\ntry {\n safeInner();\n} catch (e) {}\n```\n\n### `no-inline-styles`\n\n```tsx\n// Bad - inline style objects\n
Hello
\n\n// Good - Tailwind CSS classes\n
Hello
\n```\n\n### `no-string-coerce-error`\n\n```typescript\n// Bad - String() on a non-Error object produces '[object Object]'\nconst message = error instanceof Error ? error.message : String(error);\n\n// Good - JSON.stringify preserves object structure\nconst message = error instanceof Error ? error.message : JSON.stringify(error);\n```\n\n### `logger-error-with-err`\n\n```typescript\n// Bad - missing err property\nlogger.error({}, 'something failed');\nlogger.error({ userId: 1 }, 'request failed');\nlogger.error('something went wrong');\n\n// Good - includes err for stack traces\nlogger.error({ err: error }, 'something failed');\nlogger.error({ err: new Error('x'), userId: 1 }, 'request failed');\n```\n\n### `no-silent-skip`\n\n```typescript\n// Bad - silently skips when user is falsy\nfunction process(user) {\n if (user) {\n sendEmail(user);\n updateDb(user);\n }\n}\n\n// Good - logs why the else case was skipped\nfunction process(user) {\n if (user) {\n sendEmail(user);\n updateDb(user);\n } else {\n logger.warn('No user provided, skipping processing');\n }\n}\n\n// Also fine - guard clause with early return\nfunction process(user) {\n if (!user) return;\n sendEmail(user);\n updateDb(user);\n}\n```\n\n### `no-manual-retry-loop`\n\n```typescript\n// Bad - manual retry loop with setTimeout\nfor (let attempt = 0; attempt < 15; attempt++) {\n const result = await checkStatus(id);\n if (result.ready) return result;\n await new Promise((resolve) => setTimeout(resolve, 2000));\n}\n\n// Good - use a retry library\nimport retry from 'async-retry';\nconst result = await retry(\n async () => {\n const res = await checkStatus(id);\n if (!res.ready) throw new Error('not ready');\n return res;\n },\n { retries: 15, minTimeout: 2000 },\n);\n```\n\n---\n\n### `no-emoji-icons`\n\n```typescript\n// Bad - emoji characters as icons\n✅ Done\n