TypeScript — Configure, Type-Check and Migrate

Overview

TypeScript 7.0 (July 2026) is the native port of the compiler: the same tsc command, usually 8–12x faster on a full build, with no programmatic API yet. It keeps the defaults introduced in 6.0, which differ from 5.x, so a tsconfig.json copied from an older project often fails. This skill covers settings per target, type-checking in CI, running .ts files directly, patterns that keep types truthful, and migrating JavaScript.

Instructions

Check the compiler version first

Run npx tsc --version; the defaults depend on it.