If you write TypeScript, you have probably seen the headline by now: the 7.0 compiler is about 10 times faster. You may have even heard the stories going around, like Sentry's build dropping from 133 seconds to 16, or the huge VS Code project going from over a minute to under ten. That kind of speed makes any team want to jump on it right away.
If you are on an old version, this is barely a question, you will skip straight to 7.0, not upgrade to 6.0 when something newer is out. The ones actually weighing "6.0 or 7.0" are the teams already on 6.0, deciding whether to stay there or make the move.
And it is a fair thing to wonder, because 7.0 is still a beta. It is not finished, and switching your stable 6.0 setup to it can cause problems you will not catch until something breaks. So the faster builds pull you one way, and the 6.0 you already trust pulls you the other. That is the whole TypeScript 7.0 vs 6.0 decision in a nutshell.
So let's keep this practical. I will walk through what changed in each version, and exactly how I would handle the move on a real codebase.
TypeScript 7.0 vs 6.0 at a Glance
Before the details, here is the quick side-by-side:
| What Matters | TypeScript 6.0 | TypeScript 7.0 |
|---|---|---|
| What it is | The last version of the old compiler | The compiler was rebuilt from the ground up |
| Built in | TypeScript, runs on Node.js | Go, runs as a native program |
| Main goal | Clean up and prepare for 7.0 | Make builds about 10x faster |
| Build speed | Same as before | Roughly 10x faster |
| New language features | A few small ones | None, same language and rules |
| Status | Stable | Beta, close to finished |
| Plugins and transformers | Work as usual | Not supported yet |
| Who it is for | Everyone, right now | Anyone wanting speed, run in parallel |
What Changed in TypeScript 6.0
TypeScript 6.0 is a transition release. Microsoft built it as a bridge from the older 5.x line to 7.0, and its main job is to prepare your code for that move. The changes fall into three buckets.
Deprecated Compiler Options Being Phased Out
6.0 flags old options that the new Go compiler will not support, such as baseUrl. They still work in 6.0, but now they throw a warning. That warning is your grace period: you can fix these while they are optional, before 7.0 removes them and turns them into hard errors.
New Default Settings in tsconfig
Several defaults changed to match how 7.0 behaves. The types field now starts empty instead of automatically pulling in every installed @types package, and rootDir no longer tries to guess your source folder. These are small lines in tsconfig.json, but if your project quietly relied on the old behavior, your build can break until you set them explicitly.
The Few Genuine New Features
It is not all cleanup. 6.0 also ships some additions, like updated DOM types and the new Temporal date-and-time APIs. They are useful, but they are not the reason 6.0 exists, the preparation is.
What Changed in TypeScript 7.0
The big shift in TypeScript 7.0 is not the language, it is the engine. Your code and its rules stay exactly the same, but the compiler running them is brand new.
A Native Compiler Rewritten in Go
The compiler is the tool that reads your code, checks the types, and turns it into JavaScript. Until now it was written in TypeScript and ran on Node.js, which made it slow on large projects. For 7.0, Microsoft rewrote it in Go, a language that compiles to a fast native program with no Node.js startup cost.
Roughly 10x Faster Builds and Editor Startup
That rewrite is where the speed comes from. Microsoft measured the VS Code codebase dropping from 77 seconds to about 7.5 in type-checking. On a large project, that reshapes your whole day: faster CI runs, quicker editor startup, and far less waiting on every build.
How Stable the 7.0 Beta Really is
7.0 is still a beta, but a solid one. Microsoft reports it matches the old compiler on 99.6% of its tests, and large teams are already running it on real codebases. For the core job, checking types and compiling code, it is reliable today, even though it is not officially finished.
The Tooling That Does Not Work Yet
The rough edge is everything built around the compiler. Anything that plugged into the old one through its JavaScript API does not work yet: custom plugins, code transformers, and tools that import typescript directly. Some editor quick-fixes and refactors are still missing too, and the stable API to fix this is not expected until a 7.1 release a few months out. If your setup leans on these tools, that is what will trip you up, and when the migration gets tricky, it can help to hire TypeScript developers who have done it before.
Which Should You Move to, 6.0 or 7.0?
When it comes to the TypeScript 7.0 vs 6.0 choice, the answer is that it is not really either-or. The right call depends on where you are starting from.
If you are still on TypeScript 5.x
Move to 6.0 first. Upgrade, fix the deprecation warnings while they are still just warnings, and make your config explicit. This is the cleanup that makes the jump to 7.0 painless later, so do not skip straight past it.
If you are already on TypeScript 6.0
You do not have to choose between staying put and jumping. The smart move most teams are making is to run 7.0 alongside your current setup, not replace it. Add the 7.0 compiler as a separate step in your CI so you get the faster type-checking, while your existing 6.0 toolchain keeps handling everything else. Nothing is ripped out, and nothing breaks.
When it is better to wait
Hold off on a full switch if your build depends on the things that are not ready yet, custom plugins, transformers, or tools that import typescript. In that case, keep 6.0 as your main compiler and only flip fully once the 7.1 API lands.
A Quick Decision Guide
| Your Situation | What to Do |
|---|---|
| Still on 5.x | Move to 6.0 first, fix the warnings, then trial 7.0 |
| On 6.0, slow builds hurt daily | Add 7.0 in parallel now for the speed |
| On 6.0, rely on plugins or transformers | Keep 6.0 as main, test 7.0 on the side |
| Small, simple project | Trying 7.0 now is low-risk |
Getting this set up cleanly the first time saves a lot of pain later. A TypeScript development company can handle the migration and CI setup so your team keeps shipping while the move happens in the background.
Conclusion
So, TypeScript 7.0 vs 6.0 is not really a question of which one to pick. They work together. 6.0 gets your code ready by clearing out what 7.0 will drop, and 7.0 brings the roughly 10x faster compiler once you are ready for it.
For most teams on 6.0, the answer is not "now or wait", it is both. Start running 7.0 in parallel today to enjoy the speed, but keep your stable setup in charge until the tooling you depend on catches up. That way you get the best of the new compiler without betting your project on a beta.
The faster builds are coming for everyone. Moving now, carefully and in parallel, just means you are ready the day 7.0 goes stable, instead of scrambling to catch up.