TypeScript 7.0 ships: a Go-native port 8–12x faster

On July 8, 2026, Microsoft announced TypeScript 7.0 — a native port written in Go that preserves the old codebase's structure and logic while running dramatically faster. Install it as usual with npm install -D typescript to get the new tsc.

Key points

• Full builds typically run 8–12x faster (e.g. the VS Code codebase at 11.9x) while using less memory (down 6–26%).
• Multithreading arrives via new --checkers and --builders flags to tune parallelism, plus --singleThreaded to disable it.
• --watch was rebuilt on a Go port of Parcel's file-watcher for lighter, more stable watching.
• It adopts 6.0's defaults (strict on, module defaulting to esnext) and turns many legacy options (target: es5, moduleResolution: node, baseUrl…) into hard errors.
• No programmatic API yet (expected in 7.1); you can run 6.0 side-by-side via the @typescript/typescript6 package. Embedded workflows like Vue, Svelte, Astro and Angular stay on 6.0 for now.

See the TypeScript blog for the full upgrade guide.