/react-best-practices

by Vercel Labsvercel-labs/vercel-plugin295 stars

React best-practices reviewer for TSX files. Triggers after editing multiple TSX components to run a condensed quality checklist covering component structure, hooks usage, accessibility, performance, and TypeScript patterns.

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rulesserver-parallel-nested-fetching.md

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Parallel Nested Data Fetching

When fetching nested data in parallel, chain dependent fetches within each item's promise so a slow item doesn't block the rest.

Incorrect (a single slow item blocks all nested fetches):

const chats = await Promise.all(
  chatIds.map(id => getChat(id))
)

const chatAuthors = await Promise.all(
  chats.map(chat => getUser(chat.author))
)

If one getChat(id) out of 100 is extremely slow, the authors of the other 99 chats can't start loading even though their data is ready.

Correct (each item chains its own nested fetch):

const chatAuthors = await Promise.all(
  chatIds.map(id => getChat(id).then(chat => getUser(chat.author)))
)

Each item independently chains getChat → getUser, so a slow chat doesn't block author fetches for the others.

Source: SKILL.md on GitHub

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Signed by skilld at d48b8d5. This ties the file your Agent reads to that commit on GitHub. It does not review the instructions.

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Activeupdated last week

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metadata: { "priority": 4, "docs": [ "https://react.dev/reference/react", "https://react.dev/learn" ], "pathPatterns": [ "src/components/**/*.tsx", "src/components/**/*.jsx", "app/components/**/*.tsx", "app/components/**/*.jsx", "components/**/*.tsx", "components/**/*.jsx", "src/ui/**/*.tsx", "lib/components/**/*.tsx" ], "bashPatterns": [], "importPatterns": [ "react", "react-dom" ] }
validate: [ { "pattern": "from\\s+['\"](styled-components|@emotion/styled|@emotion/react|@mui/material|@chakra-ui/react)['\"]|styled\\.", "message": "Legacy CSS-in-JS or component library detected. Consider shadcn/ui + Tailwind for modern Vercel-native UI.", "severity": "warn", "upgradeToSkill": "shadcn", "upgradeWhy": "Migrate from CSS-in-JS/MUI/Chakra to shadcn/ui + Tailwind CSS for better SSR performance and Vercel ecosystem alignment.", "skipIfFileContains": "@/components/ui|shadcn|tailwindcss" } ]
retrieval: { "aliases": [ "react review", "component quality", "tsx linter", "react patterns" ], "intents": [ "review react code", "improve component quality", "check accessibility", "optimize react" ], "entities": [ "hooks", "accessibility", "React", "TSX", "component" ] }
chainTo: [ { "pattern": "from\\s+['\\\"](styled-components|@emotion/styled|@emotion/react|@mui/material|@chakra-ui/react)['\"]|styled\\.", "targetSkill": "shadcn", "message": "Legacy CSS-in-JS or component library detected — loading shadcn/ui guidance for modern Vercel-native UI." } ]

/react-best-practices