Shubham Rathore’s Post

TypeScript 6.0 shipped March 23, 2026. It's the last version of the TypeScript compiler written in TypeScript. Everything after it — TypeScript 7.0 — is rebuilt in Go. 🐳 The numbers: → VS Code (1.5M lines): 77 seconds → 7.5 seconds → Sentry codebase: 133 seconds → 16 seconds → Memory usage: cut in half That's not a small improvement. That's a different category of tool. But first — TypeScript 6.0 is the bridge release you need to get through. Here's what changed: 🔧 9 new defaults: strict ON, ESM as default, bundler module resolution, all files treated as modules ❌ Breaking changes: ES5 target removed, AMD/UMD deprecated, --outFile gone, @types no longer auto-discovered ✅ New features: - Temporal API types (proper date handling, finally) - RegExp.escape() and Promise.try() types - Map.getOrInsert() typed correctly - #/ subpath imports - Improved method type inference 💡 The Go compiler (tsgo) is already available: npm install @typescript/tsgo tsgo --project tsconfig.json Try it. The compile time difference is immediate and shocking. I wrote the full guide for what changed, what broke, how to upgrade, and what TypeScript 7.0 actually means for your CI/CD and monorepo workflows. Is your team already planning the 6.0 upgrade? 👇 #TypeScript #JavaScript #WebDev #Frontend #NodeJS #100DaysOfBlogging

If you're still on TypeScript 5.x, here's what you need to know: TypeScript 6.0 shipped last month, and everything it deprecates gets hard removed in 7.0. There is no grace period after that. I did a migration myself today and wrote a migration guide that breaks down the full scope of changes: → 10+ new compiler defaults that flip existing behavior → 13 deprecations, each with a concrete replacement → Behavioral shifts that won't trigger warnings but can still break your build → A step by step migration checklist, prioritized by impact → The ts5to6 CLI tool that automates the most disruptive config rewrites The guide includes every PR reference, linked issues, and the rationale behind each change. 🔗 https://lnkd.in/e7YXdprc Feedback and corrections welcome.

TypeScript 7 beta is where the TypeScript Go compiler stops feeling like a lab demo and starts looking like a real workflow decision. The headline is speed. The more interesting part is latency. Faster type checking is nice in the same way a faster build is nice: you do not fully appreciate it until your editor stops sighing every time you touch a shared type. CI gets less dramatic. Refactors feel less like filing paperwork. That is the part of TypeScript performance that actually changes behavior. But this is still a beta, not a victory lap. `tsgo` and the TypeScript native preview are arriving in the middle of real JavaScript tooling ecosystems: bundlers, linters, test runners, editor plugins, build scripts, monorepos, and everyone's favorite archaeological site, deprecated compiler flags. The migration story matters as much as the compiler story. TS6 and TS7 side-by-side sounds boring until you are the person explaining why one package works perfectly and another one depends on a programmatic API that is not stable until later releases. That is the practical read: TypeScript 7 beta is not "rewrite your tooling this afternoon." It is "start measuring where your feedback loops hurt." The best developer experience upgrades are rarely glamorous. They just make the machine argue with you faster. Where would you test `tsgo` first: editor latency, CI, or a painful monorepo build? #TypeScript #JavaScript #WebDevelopment #DeveloperExperience #FrontendDevelopment #SoftwareEngineering #DevTools

The Ultimate JS Success Story Abandons JS The tool that made JavaScript enterprise-ready is abandoning JavaScript. Microsoft is rewriting the TypeScript compiler in Go. Why? Pure performance. Node.js hits a hard ceiling on heavy CPU-bound tasks like massive AST parsing. Go’s concurrency model shatters that ceiling. The architectural irony is incredible. We spent a decade proving JavaScript could run anywhere. Now we are finally admitting it shouldn't. I've watched this shift accelerate as Rust took over our build tools with SWC and Turbopack. Now it’s happening to the compiler itself. JavaScript won the UI. Systems languages won the infrastructure. Are you still forcing heavy backend workers through Node?

TypeScript 7.0 Beta is here and OH MY GOODNESS it's going to be FAST! So, they ported the entire compiler from JavaScript to Go. Native code + shared memory parallelism. The result? Million-line codebases that used to take minutes now take seconds. Some highlights that made me grin: * Parallel type-checking – 4 workers by default, configurable with --checkers. * Parallel project reference builds, which let you build multiple projects at once. * Same semantics – they methodically ported, not rewrote. The code behaves exactly the same, just faster. * There's a VS Code extension already. The beta package is @typescript/native-preview. Also, they kept TypeScript 6.0 compatibility side-by-side (tsc6), so zero risk. https://lnkd.in/dRGGX6qp

I never want to work without TypeScript again. 🙂 I know it has been around for a long time by now, but in my professional experience 𝘁𝗵𝗲𝗿𝗲 𝗮𝗿𝗲 𝘀𝘁𝗶𝗹𝗹 𝗺𝗮𝗻𝘆 𝗽𝗲𝗼𝗽𝗹𝗲 𝘁𝗵𝗮𝘁 𝗿𝗲𝗳𝘂𝘀𝗲 𝘁𝗼 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵 𝗶𝘁. So even if we are in 2026, i think it is still relevant to talk about it. How much time is wasted double checking the response structure and field types? How frustrating it is to spend time debugging only to find out that there was a typo in a field name? And god forbid, what if there is no external source of truth of the APIs interfaces? Functions do not need to be burdened by type guarding, and we are warned immediately if we pass an argument of the wrong type. I could go on and on. 𝗦𝗼, 𝘄𝗵𝘆 𝗱𝗼 𝗽𝗲𝗼𝗽𝗹𝗲 𝘀𝘁𝗶𝗹𝗹 𝗿𝗲𝘀𝗶𝘀𝘁? "𝗧𝗼𝗼 𝗺𝘂𝗰𝗵 𝗼𝘃𝗲𝗿𝗵𝗲𝗮𝗱." Sure, typing a function signature takes a few extra seconds. But is that time not recovered tenfold by the lack of regressions and easier refactoring? "𝗜 𝗱𝗼𝗻'𝘁 𝘄𝗮𝗻𝘁 𝘁𝗼 𝗳𝗶𝗴𝗵𝘁 𝘁𝗵𝗲 𝗰𝗼𝗺𝗽𝗶𝗹𝗲𝗿." We’ve all been there. But "fighting" the tool is usually just a symptom of the learning curve. Refusing TypeScript because it has rules is like refusing React because you don't want to learn hooks; it’s a tool, and mastering its complexities is what leads to better outcomes. If we value speed, we should value the tool that prevents us from constantly tripping over our own feet. Is "speed" really a valid excuse if it leads to a more fragile codebase?

I ran `tsgo` on my 7-package TypeScript monorepo. The speed gain was 3.2x, not 10x. That 10x number everyone's quoting? It's from VS Code's codebase. Millions of lines. Most of us won't see it. But speed isn't what worries me about the TypeScript Go rewrite. GitHub issue #516 has been open since March 2025. The plugin API that Angular, Vue, ts-morph, and hundreds of tools depend on is gone. No replacement timeline. Jake Bailey from the TS team said it directly: "Go is a statically compiled language without good plugin support." The compiler is getting faster. The community is getting further from the machinery. I wrote about what this actually looks like from inside a production TypeScript stack (Engram, Ouija, 6 MCP servers, Next.js portfolio) and where my migration broke. https://lnkd.in/dMPEBtq9 #TypeScript #DeveloperTooling #ProjectCorsa

🚀 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁 7.0 𝗷𝘂𝘀𝘁 𝗱𝗿𝗼𝗽𝗽𝗲𝗱 (𝗯𝗲𝘁𝗮)... 𝗮𝗻𝗱 𝗶𝘁'𝘀 𝗮 𝒃𝒊𝒈 𝒅𝒆𝒂𝒍 Not because of new features. Because of what's under the hood. ⚡ 1. 𝗨𝗽 𝘁𝗼 10𝘅 𝗳𝗮𝘀𝘁𝗲𝗿 𝗯𝘂𝗶𝗹𝗱𝘀 Yes, really. Massive performance gains thanks to: 🔹 Native execution 🔹 Parallelism 🔄 2. 𝗧𝗵𝗲 𝗰𝗼𝗺𝗽𝗶𝗹𝗲𝗿 𝘄𝗮𝘀 𝗿𝗲𝘄𝗿𝗶𝘁𝘁𝗲𝗻 𝗶𝗻 𝗚𝗼 TypeScript is no longer running on JavaScript. It's now a native system. 🧠 3. 𝗦𝗮𝗺𝗲 𝗯𝗲𝗵𝗮𝘃𝗶𝗼𝗿, 𝗻𝗲𝘄 𝗲𝗻𝗴𝗶𝗻𝗲 🔹 Same type system 🔹 Same semantics 👉 Just dramatically faster 🧪 4. 𝗔𝗹𝗿𝗲𝗮𝗱𝘆 𝘂𝘀𝗲𝗱 𝗶𝗻 𝗿𝗲𝗮𝗹-𝘄𝗼𝗿𝗹𝗱 𝗰𝗼𝗱𝗲𝗯𝗮𝘀𝗲𝘀 Multi-million line projects are already running it. And the feedback?... Huge speedups. 🔁 5. 𝗦𝗺𝗼𝗼𝘁𝗵 𝗺𝗶𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝗽𝗮𝘁𝗵 You can run TS 6 and TS 7 side-by-side. 👉 No risky upgrade needed. 🧠 The real shift: TypeScript is moving from: "language innovation" ➡️ to: "developer experience at scale" 🚀 The takeaway: The future of TypeScript isn't more features... 👉 It's 𝒇𝒂𝒔𝒕𝒆𝒓 𝒇𝒆𝒆𝒅𝒃𝒂𝒄𝒌 𝒍𝒐𝒐𝒑𝒔 🔗 Source: https://lnkd.in/dQtvQHjz #TypeScript #JavaScript #Frontend #Backend #Performance #DX

TypeScript 7.0 Beta just dropped and if you work with TypeScript codebases this one is worth paying attention to. The headline is simple. 10x faster than TypeScript 6.0. That is not a minor performance tweak. Microsoft rewrote the entire TypeScript compiler in Go. Same type checking logic, same semantics, identical behavior to TypeScript 6.0. Just native code speed and shared memory parallelism instead of JavaScript running the compiler itself. Here is what that means in practice. Build times that used to take minutes now take seconds. The editor experience in VS Code is noticeably more responsive. Type checking, parsing, and emitting now run in parallel. For monorepos with multiple projects the new builders flag lets you build them simultaneously too. The teams who validated this before launch are not small. Bloomberg, Canva, Figma, Google, Slack,Vercel, Notion, Linear. Multi-million line codebases reporting majority reductions in build times across the board. You can try it today via npm with the native preview package and install the TypeScript Native Preview extension for VS Code. The beta is described as close to production ready and already in use in major codebases. Stable release is expected within two months. For anyone building serious TypeScript projects this is the most significant compiler improvement in years. Not a new language feature. Just dramatically faster tooling that gets out of your way and lets you ship faster.

TypeScript 6.0 just dropped and honestly it's less of a feature release and more of a wake-up call. This is the last version built on JavaScript before TypeScript 7.0 arrives. Rewritten entirely in Go. And 6.0 exists for one reason: to get your codebase ready for that shift. Here's what actually matters 👇 The defaults changed. Silently. Painfully. If you haven't touched your tsconfig in a while, surprise: → strict is now true by default → module defaults to esnext → target defaults to es2025 → types defaults to empty array That last one alone can cut your build times by up to 50%. Not a typo. New things worth knowing → Temporal API types finally landed. Goodbye Date object hell. → Map.getOrInsert is now typed → RegExp.escape built in → Subpath imports with #/ now supported What's getting cleaned out before 7.0 → --moduleResolution node deprecated → AMD, UMD, SystemJS module targets gone → target: es5 deprecated → --outFile and --baseUrl both deprecated The direction is clear. TypeScript is not being polite about legacy code anymore. TypeScript 7.0 in Go is already available as a preview in VS Code. Full release expected within months. If your tsconfig still looks like it did in 2021, now is genuinely the time to fix that. Not when 7.0 drops. Now. #TypeScript #WebDevelopment #JavaScript #Frontend #SoftwareEngineering