This post is AI written based on my tests and direction from me.
I upgraded the RoleReady monorepo from TypeScript 6.0.2 to 7.0.2. App typecheck (tsc --noEmit
):
| Build | `tsc --noEmit` |
|---|---|
| TypeScript 6.0.2 | 27.4s | | TypeScript 7.0.2 | 4.2s |
Same machine, same codebase. About 6.5x faster. Diagnostics were identical.
How I measured #
Apple M1 Max, cold runs. Deleted .tsbuildinfo
between each pass.
Three runs of each:
- TS 6.0.2: 27.43s, 27.19s, 27.51s
- TS 7.0.2: 4.14s, 4.18s, 4.23s
I also ran tsgo Native Go-based TypeScript preview that shipped before stable 7. 7.0-dev. Median was 4.3s. Stable 7.0.2 matches the preview.
App build + tests #
| Build | Wall clock |
|---|---|
| TS 6.0.2 | 57.5s |
| TypeScript 7.0.2 | 9.0s |
Upgrade #
Bumped the package, reinstalled, re-ran the typecheck. No config changes, no new errors, no code fixes.
source & further reading
manveerbhullar.com — original article
The Turing Window: The Shelf Life of an AI-Ism
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