TypeScript's compiler is now a Go binary with parallelized type-checking via configurable --checkers workers, replacing the JS-bootstrapped compiler entirely while maintaining identical semantics.
Summary
Compile times shrink by majority on real codebases (Bloomberg, Figma, Slack already tested); editing latency drops across LSP-compatible editors. CI pipelines and watch mode become usable again on large monorepos.
Why it matters
Compile times shrink by majority on real codebases (Bloomberg, Figma, Slack already tested); editing latency drops across LSP-compatible editors. CI pipelines and watch mode become usable again on large monorepos.
Implementation verdict
Ready now as RC. Install via `npm install -D typescript@rc` or test in VS Code with TypeScript Native Preview extension. Side-by-side with TS 6.0 requires alias setup (`npm install -D typescript@npm:@typescript/typescript6`). Stable API delayed until 7.1, but CLI/LSP are production-grade. Tune --checkers (default 4) and --builders flags per machine specs; watch for memory trade-offs in CI.
Sources
Dev Signal
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