June 21, 2026
Go hard or Go home
TypeScript 7 RC: the compiler rewritten in Go, around 10x faster
Microsoft made TypeScript wildly faster, and the comments instantly went feral
TLDR: TypeScript 7 could make coding tools feel about 10 times faster because Microsoft rebuilt the engine underneath in Go. But the comment drama swerved fast, with people questioning whether the post itself was just an AI-generated recap instead of celebrating the speed boost.
Microsoft dropped the TypeScript 7 release candidate, and the headline feature is a massive speed boost: the tool that checks and builds TypeScript code has been rebuilt in Go, a language that produces fast native programs. The promise is simple enough for non-coders too: the same code, same rules, but builds and editor feedback can feel around 10 times faster. Big names like Figma, Slack, Notion, Vercel, and Bloomberg have reportedly been testing it and backing the hype, which made plenty of developers react like they'd just been handed extra hours back in their week.
But because this is the internet, the comments didn't just clap politely. The spiciest reaction in the thread wasn't even about speed — it was a drive-by accusation that the post itself felt like an AI summary of Microsoft's own official announcement. That instantly shifts the mood from "wow, faster tools!" to "wait, are we even discussing the real thing here?" It's classic comment-section drama: one camp is dazzled by the glow-up, another is side-eyeing the messenger.
Under the hype, there is one sober warning the community is likely to care about: upgrading won't be all sunshine. TypeScript 7 turns some older settings from warnings into full-on errors, so developers are being told to pass through version 6 first and clean house. In other words, everyone loves a makeover — until they realize it comes with a closet purge.
Key Points
- •Microsoft released the TypeScript 7 Release Candidate, and the article says its compiler has been fully rewritten in Go.
- •The article reports that TypeScript 7 builds are often around 10x faster than TypeScript 6, based on Microsoft measurements and testing by several companies.
- •The same rewritten foundation also powers Language Server Protocol features, which the article says improves editor responsiveness on large projects.
- •TypeScript 7 adopts TypeScript 6 defaults and turns deprecations from 6 into hard errors, making an upgrade through TypeScript 6 an important migration step.
- •Microsoft provides a side-by-side migration path using the @typescript/typescript6 compatibility package and npm aliases while tooling support catches up, with broader API stability expected around TypeScript 7.1.