{"slug": "typescript-7-is-fast", "title": "TypeScript 7 is fast", "summary": "TypeScript 7.0.2 delivers a 6.5x speed improvement over version 6.0.2, reducing type-checking time from 27.4 seconds to 4.2 seconds on an Apple M1 Max machine. The upgrade required no configuration changes or code fixes, making it a seamless performance boost for developers.", "body_md": "This post is AI written based on my tests and direction from me.\n\nI upgraded the RoleReady monorepo from TypeScript 6.0.2 to 7.0.2. App typecheck (`tsc --noEmit`\n\n):\n\n| Build | `tsc --noEmit` |\n|---|---|\n| TypeScript 6.0.2 | 27.4s |\n| TypeScript 7.0.2 | 4.2s |\n\nSame machine, same codebase. About 6.5x faster. Diagnostics were identical.\n\n## How I measured\n\nApple M1 Max, cold runs. Deleted `.tsbuildinfo`\n\nbetween each pass.\n\nThree runs of each:\n\n- TS 6.0.2: 27.43s, 27.19s, 27.51s\n- TS 7.0.2: 4.14s, 4.18s, 4.23s\n\nI 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.\n\n## App build + tests\n\n| Build | Wall clock |\n|---|---|\n| TS 6.0.2 | 57.5s |\n| TypeScript 7.0.2 | 9.0s |\n\n## Upgrade\n\nBumped the package, reinstalled, re-ran the typecheck. No config changes, no new errors, no code fixes.", "url": "https://wpnews.pro/news/typescript-7-is-fast", "canonical_source": "https://manveerbhullar.com/writing/typescript-7-upgrade/", "published_at": "2026-07-08 00:00:00+00:00", "updated_at": "2026-07-14 20:19:04.595812+00:00", "lang": "en", "topics": ["developer-tools"], "entities": ["TypeScript", "Microsoft", "RoleReady", "Apple M1 Max"], "alternates": {"html": "https://wpnews.pro/news/typescript-7-is-fast", "markdown": "https://wpnews.pro/news/typescript-7-is-fast.md", "text": "https://wpnews.pro/news/typescript-7-is-fast.txt", "jsonld": "https://wpnews.pro/news/typescript-7-is-fast.jsonld"}}