Individual skill
typescript
Use when writing or fixing TypeScript type code (.ts/.tsx/.d.ts), modeling data with generics/unions/branded types, diagnosing narrowing failures, or configuring tsconfig and the build toolchain. NOT runtime code, fs/streams/http (that is `nodejs`); NOT component/route typing (that is `react`/`nextjs`); NOT ORM type-gen (that is `drizzle-orm`).
skills/typescript/SKILL.md
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- Observed behavior
- Local scripts
- Last checked
- Nov 6, 2026
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- Repository last updated
- Nov 4, 2026
- License
- MIT
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- typescript Declared skill tag
- types Declared skill tag
- generics Declared skill tag
- tsconfig Declared skill tag
- type-safety Declared skill tag
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SKILL.mdcore · 11,065 bytesevals/README.mddoc · 1,041 bytesevals/cases.yamlasset · 3,135 bytesreferences/build-and-monorepo.mddoc · 5,710 bytesreferences/type-system.mddoc · 5,670 bytesscripts/verify.shruns · 1,775 bytes
Read excerpt
# Idiomatic TypeScript types
Express data and contracts precisely in the TypeScript type system, and configure the
compiler so the types actually hold.
Targets **TypeScript 5.9** (current stable, Q1 2026): redesigned `tsc --init` defaults
(`module: nodenext`, `target: esnext`, `moduleDetection: force`, strict on), `import defer`
for deferred module evaluation, expandable editor hovers. The **TypeScript 7 native
compiler** (`tsgo`, the Go port) is in preview as `@typescript/native-preview` and
type-checks roughly 10x faster (VS Code's 1.5M LOC: 89s -> 8.74s) — adopt it for fast
local checks; stable 7.0 lands early 2026.
## Boundary: language vs runtime vs framework
