Apply practical patterns for writing and reviewing TypeScript or JavaScript, from strict compiler settings and safe input narrowing to generics, async errors, and module boundaries. The guidance helps keep public APIs explicit and data handling type-safe.
TypeScript patterns for strict, type-safe, maintainable code in modern TypeScript and JavaScript applications. Covers strict compiler configuration, type design, narrowing, discriminated unions, generics, async and error handling, module boundaries, dependency hygiene, and type-level testing. Use when writing or reviewing TypeScript or JavaScript code.
Run score Not tested
See how to installThis skill provides guidance for type design and code structure when writing, reviewing, or refactoring TypeScript and JavaScript. It covers strict compiler settings, using unknown and narrowing instead of any, and giving exported functions explicit types. It also explains how to model states and caller-dependent types with discriminated unions and generics. Other topics include runtime validation of external input, async operations and errors, dependency direction, public exports, type tests, and compiler configuration.
Use it to configure a new TypeScript project, address type errors, or review changes involving .ts and .tsx files. It can also guide efforts to reduce loose typing or design types, generics, and module boundaries for a feature. The patterns are also relevant when reviewing JavaScript or deciding how to validate runtime data.
tsconfig.json for stricter type checking.”any with safe input validation and type narrowing.”To run type tests or checks, the relevant tools, such as tsc, Vitest, or ESLint, must be installed in the project. Zod is given as an example input validation library, but using a particular library is not required.
This overview was written by AI (OpenAI Codex) from the public SKILL.md. Check the original below for the exact behavior.
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Not counted in the score. Rated by AI (OpenAI Codex) as of Oct 30, 2026. Treat it as a guide and read the original before installing.
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