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From typescript-knowledge-patch
Provides TypeScript 5.9+ knowledge: import defer, --module node20, ArrayBuffer breaking change, TS7 native Go port (tsgo). Load before TypeScript projects.
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Claude's baseline knowledge covers TypeScript through 5.8. This skill provides features from 5.9 (May 2025) onwards.
Provides 2025 TypeScript strict mode tsconfig.json recommendations, explains strict flags like noUncheckedIndexedAccess, moduleResolution (Bundler vs NodeNext), verbatimModuleSyntax. Use for new projects or stricter type safety migrations.
Provides TypeScript 5.x patterns for strict mode, generics, utility types, interfaces, unions, intersections, literals, and narrowing. Use when writing TS code or typing JS projects.
Provides advanced TypeScript/JavaScript expertise for type-level programming, performance optimization, monorepo management, migrations, and modern tooling. Analyzes projects, applies fixes, and validates with typechecks/tests.
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Claude's baseline knowledge covers TypeScript through 5.8. This skill provides features from 5.9 (May 2025) onwards.
Source: https://devblogs.microsoft.com/typescript/
| Feature | What to know |
|---|---|
import defer | import defer * as ns from "mod" — defers module execution until first property access. Namespace imports only. Requires --module preserve or esnext. |
--module node20 | Stable pinned option for Node.js 20. Implies --target es2023. |
ArrayBuffer breaking change | ArrayBuffer is no longer supertype of TypedArray. Fix: use Uint8Array<ArrayBuffer>, access .buffer, or update @types/node. |
| Type argument inference | Generic type inference fixes may introduce new errors from "leaked" type variables. Fix by adding explicit type arguments to generic function calls. |
| Topic | What to know |
|---|---|
| Versioning | TS 6.0 = last JS release (no 6.1). TS 7.x = native Go rewrite (tsgo). Repo: microsoft/typescript-go |
| Install | npm install -D @typescript/native-preview → npx tsgo |
| TS 6/7 breaking changes | --strict on by default, --target es5 removed, --baseUrl removed, --moduleResolution node10 removed |
| Migration tool | npx @andrewbranch/ts5to6 --fixBaseUrl / --fixRootDir |
| Full details | See references/typescript-7-transition.md |