TypeScript 7.0 stable native Go compiler

Category: Languages
Status: confirmed
Sources: TypeScript blog, HN discussion
Summary: Microsoft released TypeScript 7.0 stable on 2026-07-08, the native compiler port rewritten in Go, and it remained on the Hacker News front page on 2026-07-09. Microsoft reports full builds about 8 to 12 times faster, editor open about 13 times faster, and 6 to 26 percent lower memory. Breaking defaults versus 6.0 include strict true, types defaulting to an empty list, and rootDir at the project root, plus removal of ES5, AMD, UMD, and SystemJS emit and several deprecated flags becoming hard errors.
Why it matters: The largest TypeScript performance change in years also forces configuration and build changes on existing projects, so upgrade planning is nontrivial.
Follow-up: Track migration reports for the removed module formats and the strict-by-default switch.