𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁 𝟳.𝟬 𝗶𝘀 𝗵𝗲𝗿𝗲, 𝗮𝗻𝗱 𝗶𝘁 𝗿𝗲𝗮𝗹𝗹𝘆 𝗶𝘀 𝟭𝟬𝘅 𝗳𝗮𝘀𝘁𝗲𝗿 🚀 In March 2025, Microsoft said they will create a 10x faster TypeScript by porting the compiler to Go. TypeScript 7.0 shipped on July 8, and here are the numbers: 🔹 VS Code (2.3M LoC): full build 125.7s → 10.6s (11.9x faster) 🔹 Sentry (1.9M LoC): 139.8s → 15.7s (8.9x) 🔹 Playwright: 12.8s → 1.47s (8.7x) 🔹 First errors in the editor: 17.5s → under 1.3s 🔹 Memory: up to 26% less Teams already said the following: 🔹 Slack cut type-checking in CI from 7.5 min to 1.25 min 🔹 Canva sees the first error after 4.8s instead of 58s 🔹 One Microsoft org saves 400 CI hours every month This version (7.0) is also a cleanup. The ES5 target is no longer there, and baseUrl also, while strict mode is on by default. The thing that remained is that there is no programmatic API until version 7.1, so if you are using Vue or Svelte, you still need TS 6 in the editor. The interesting part is that they tried Rust first. Anders Hejlsberg said: "The borrow checker doesn't allow circular data structures. And our compiler is chock-full of circular data structures." So, Go won. Porting instead of rewriting kept the exact compiler behavior. Will you move to TypeScript 7.0 now, or wait for 7.1? Image: Microsoft.