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writing-typescript

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Idiomatic TypeScript development. Use when writing TypeScript code, Node.js services, React apps, or TypeScript design advice. Emphasizes strict typing, boundary validation, composition, fast feedback, behavior tests, and project-configured tooling. NOT for Go, Python, Rust, plain HTML/CSS/JS, or server-rendered templates (use writing-web).

src/skills/writing-typescript/SKILL.md

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# TypeScript Development

Follow the repository's TypeScript version, tsconfig, package manager, framework, and test runner. In a monorepo, work from the nearest `package.json` and `tsconfig.json` and name the package you chose.

## Defaults

- Never weaken compiler options to pass a check. New configs enable `strict`, `noUncheckedIndexedAccess`, `exactOptionalPropertyTypes`, `useUnknownInCatchVariables`, `noImplicitOverride`, and `noFallthroughCasesInSwitch`.
- Treat HTTP responses, JSON, env, storage, form data, and SDK output as `unknown`. Narrow at the boundary with the project's schema library or a small type guard; never cast `await res.json()` to a domain type.
- Avoid `any`, `as` casts, non-null `!`, and broad index signatures unless a runtime check or an external type gap justifies them.
- Discriminated unions for variants and async state, with an exhaustive `never` check. Literal unions or `as const` arrays instead of new enums. `satisfies` for config maps.
- Result unions for recoverable failures callers must branch on; throw `Error` instances otherwise.
- Pass dependencies as parameters; no singletons or hidden module state. Thread `AbortSignal` through work that can outlive its caller.
- Ask before adding a schema, form, query, or state library the project does not already use.