TypeScript 7

The speed up numbers based on their testing:

    Codebase    | TypeScript 6 | TypeScript 7 | Speedup
    ------------|--------------|--------------|--------
    vscode      | 125.7s       | 10.6s        | 11.9x
    sentry      | 139.8s       | 15.7s        | 8.9x
    bluesky     | 24.3s        | 2.8s         | 8.7x
    playwright  | 12.8s        | 1.47s        | 8.7x
    tldraw      | 11.2s        | 1.46s        | 7.7x

Quick question: How does this affect downstream tools like tsdown and esbuild, which need to build the TypeScript codebase? Can I use TS 7 and current tsdown together?

Remember when people would argue about how types weren't worth the effort?

I love TypeScript, if nothing else for how it's been able to popularize types.

the real story here is an incredible team that managed to simultaneously keep two separate codebases alive for the most advanced type system known to mankind (yeahhh yeahh Hindley-Milner eat your heart out).

huge congrats to the team!

looking forward to the Rust rewrite ;)

After a few years of using Typescript, having to use type annotations and import basic language features like `abc` in Python feels like an absolute slog.

I'm glad the JSDoc type syntax is still getting some focus. It's my favorite way to use typescript in my own projects. Some of the syntax changes will be annoying to update but most of them seem to be for the better.

No TypeScript compiler API yet, but I'm encouraged to hear that they're working on it.

For the average developer, does this mean we can simply ugprade to typescriptn 7 and start enjoying the improvements?

The speed-up improvements are incredible, can't wait for this to rollout to Deno. Everything I build uses TypeScript so I'm excited to see just how quick my apps compile.

After running out of Fable credits in a day on my max plan I started looking around for ways to trim down my token usage and came to the realization that all of the type spaghetti that opus wrote is probably eating up like 50-70% of my tokens.

A clean django project is probably 3-4x less code than the equivalent TS based service.

It made me consider dropping strict mode and defaulting to js for most simple things.

Are these performance improvements just for transpiling the Typescript to JS, or actually running programs written in Typescript?

I've been waiting for this for a long long time. Congrats on the release.

really excited to see this release! i've been using TypeScript for several projects like https://github.com/dyad-sh/dyad which is >250k lines of TypeScript and the speed-up makes things like running typescript check as a pre-commit hook painless

thanks DanRosenwasser and team for building such an awesome tool for so many years!

Seeing these graphs of astounding performance gains with less memory requirements makes one wonder, Why am I using server-side TypeScript and not Go?

Performance improvements, yay !

It always surprises me how little complaints there have been on HN about tsc's performance. I do both TypeScript and Rust at work, and I've seen orders of magnitude more comments on the web about how “rustc is slow” than complaints about tsc's performance and it never stops to surprise me given than in practice the later have annoyed me consistently more than the former.

Glorious Day!

Are there any plans about wasm version?

Perhaps some AI agent can vibe code TS8 in Lean 5, then it will be 100% bug free. ;-)

sub-1day-first-frame-of-DOOM LFGGGGGG

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finally it uses a normal language backend =)

I'm still not sold on typescript. I've used it off and on professionally for years and it has always just felt like a maneuver to create a safehaven to C# and java devs scrambling to find roles in the modern landscape. Doing purely functional with it is or at least was an absolute chore and so much extra typing happens for extremely obvious variable values that you could derive from the name of the variable. YES you technically can do functional programming (but as i said its a pain) and YES its optional and you dont have to use it everywhere, but try pulling that maneuver on a technical team "lets use typescript where we each feel like it".

I am still of the opinion that well organized and named JS is all that anyone needs and typescript only exists for fresh graduates and fleeing OOP devs.

edit: also the downvote button HN is not for disagreeing with comments or unpopular opinions.