--- title: "TypeScript is not TypeScript anymore..." url: https://daily.dev/posts/typescript-is-not-typescript-anymore--yvvj3pwfi source_url: https://www.youtube.com/watch?v=e7Id_PKwSCQ type: video:youtube source: "YouTube" published: 2026-07-01T12:43:19.874Z updated: 2026-07-01T12:43:39.823Z tags: ["performance", "typescript", "golang", "compiler"] reading_time: 4 upvotes: 1 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # TypeScript is not TypeScript anymore... **[YouTube](https://daily.dev/sources/youtube)** · 4 min read · 1 upvotes · 0 comments ## Summary TypeScript 7 release candidate is out, featuring a complete rewrite of the TypeScript compiler from TypeScript/JavaScript to Go. The rewrite delivers roughly 10x faster type checking — benchmarks on the Playwright repo show a drop from ~6 seconds to ~0.87 seconds. Key improvements include multi-core parallelism (previously single-threaded), new `--checkers` and `--builders` flags for controlling parallel workers, and a rewritten watch mode. The only language-level change is that template literal types now correctly preserve Unicode code points. Upgrading from TypeScript 6 to 7 should have no breaking changes; going from 5 to 7 requires passing through 6 first. A stable programmatic API for tooling authors is planned for 7.1, with a compatibility package to run v6 and v7 side by side. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#performance](https://daily.dev/tags/performance), [#typescript](https://daily.dev/tags/typescript), [#golang](https://daily.dev/tags/golang), [#compiler](https://daily.dev/tags/compiler) [View this post on daily.dev](https://daily.dev/posts/typescript-is-not-typescript-anymore--yvvj3pwfi)