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thealexlichter.com
Alexander Lichter
@thealexlichter.com
5.9K followers 690 following 940 posts
💻 DevRel @voidzero.dev
🎬 Video Content https://lichter.link/yt
💚 @nuxt.com team
🎙️ Podcast Host @dejavue.fm
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thealexlichter.com
Alexander Lichter @thealexlichter.com · Mar 19
🎉 Excited to announce that I'm joining VoidZero as DevRel!

As I was following the project from early on, I couldn't say no to the chance when @evanyou.me reached out.

I can't wait to share all the incredible things lined up for @rolldown.rs, OXC, @vite.dev, and @vitest.dev 👀
Reposted by Alexander Lichter
43081j.com
we released the new @e18e.dev ESLint plugin today! 🎉

this comes with 3 categories of rules: modernisation, performance, replacements

it also works with oxlint and most of the rules have auto-fixes 🛠️

try it out and let us know any feedback/rule suggestions in discord/bsky/github!
GitHub - e18e/eslint-plugin: The official e18e ESLint plugin for code modernization and performance best practices
The official e18e ESLint plugin for code modernization and performance best practices - e18e/eslint-plugin
github.com
December 19, 2025 at 7:44 PM
thealexlichter.com
I had to show that feature in action and tell something about Hook Filters

The best is that it works framework-agnostic and gives great indicators without being a profiling pro

It already helped improving performance in @nuxt.com

Video up now on my YouTube channel: www.youtube.com/watch?v=qIzn...
December 12, 2025 at 9:26 PM
Reposted by Alexander Lichter
voidzero.dev
You can now break down import and transform times in @vitest.dev! This works in the Vitest UI, the terminal and also via the VS Code extension.

Time to find out why tests are taking longer than expected! 👀

More in the docs
vitest.dev/config/exper...
Title: Import and transform time breakdown Three screenshots from the Vitest UI, the terminal and the VS Code Extension showing the time it takes to import a module.
December 10, 2025 at 8:06 PM
Reposted by Alexander Lichter
erus.dev
Please, leave feedback If you tried the new `fsModuleCache` experimental flag in Vitest: github.com/vitest-dev/v...
Stabilizing `fsModuleCache` · vitest-dev vitest · Discussion #9221
experimental.fsModuleCache Introduced in 4.0.11 Docs Rational: In very large projects it takes a long time to transform the whole module graph of a single test file. This can happen when one test f...
github.com
December 10, 2025 at 1:52 PM
Reposted by Alexander Lichter
voidzero.dev
Did you know that @rolldown.rs's chunking algorithm got improved, leading to less chunks than before in different scenarios?

For example when you have two entry chunks and one imports from the other. Instead of having a "facade chunk", the chunks are now merged, resulting in less network requests.
December 9, 2025 at 7:40 PM
Reposted by Alexander Lichter
voidzero.dev
Announcing Oxlint Type-Aware Linting Alpha 🎁

Just a few months after our technical preview, type-aware linting reaches the alpha milestone!

✨ Type-aware rules can now be configured
🙈 Inline comments to disable rules work for type-aware rules too
✔ Auto fixes for type-aware rules are now available
Announcing Oxlint Type-Aware Linting Alpha
Oxlint's type-aware linting has reached alpha status. Type-aware rules can be manually configured, disabled with in-line comments, and fixed automatically. This milestone also includes more rule…
voidzero.dev
December 8, 2025 at 5:58 PM
Reposted by Alexander Lichter
erus.dev
A new milestone! @vitest.dev hit 20 million mark 🎉 Took us 4 years since the first closed 0.0.0 release on December 3d, 2021 😄
An image from NPM showing vitest with 20,172,232 weekly downloads
December 8, 2025 at 1:16 PM
Reposted by Alexander Lichter
rebaar.com
Amsterdam (NL in general) has the best dev community!

Change my mind!

(With @thealexlichter.com @pi0.io @yannbf.bsky.social)
December 8, 2025 at 9:39 AM
Reposted by Alexander Lichter
voidzero.dev
What's new in ViteLand?
Our November 2025 recap is out!

✨ @vite.dev 8 Beta
👉 Oxfmt alpha
💻 @vitest.dev caching and imports breakdown
⚓️ Oxc becoming even faster!?
🎙 Updates from the Community
👀 and more

voidzero.dev/posts/whats-...
What’s New in ViteLand: November 2025 Recap
Our November 2025 recap includes the Vite 8 beta release, Vitest performance updates, Rolldown improvements, Oxc formatter alpha, and exciting community news.
voidzero.dev
December 4, 2025 at 2:45 PM
Reposted by Alexander Lichter
erus.dev
Vitest 4.0.15 comes with a cool experimental feature: Imports Breakdown. Every module shows how long it took to load in UI and in the VSCode extension!

Pass down `--experimental.printImportBreakdown` to also see it in your terminal.

vitest.dev/guide/ui.htm...
December 2, 2025 at 4:42 PM
thealexlichter.com
December is really packed. First we got the Oxfmt alpha and now the first Vite 8 beta?! 🔥

Give that all a try - it might not be the last release this month 👀
vite.dev Vite @vite.dev · 24d
⚡️ The first Vite 8.0 beta is here!

- Powered by Rolldown, bringing significantly faster production builds and more consistency
- New features such as tsconfig paths or emitDecoratorMetadata support
- Bumping browser targets aligned with Baseline Widely Available

Read more in our announcement post!
Vite 8 Beta: The Rolldown-powered Vite
The first beta of Vite 8, powered by Rolldown, is now available. Vite 8 ships significantly faster production builds and unlocks future improvement possibilities. Read more about the migration, new fe...
voidzero.dev
December 3, 2025 at 12:38 PM
Reposted by Alexander Lichter
boshen.github.io
Announcing Oxfmt: Oxc Formatter Alpha

oxc.rs/blog/2025-1...
Oxfmt: Oxc Formatter Alpha
A collection of high-performance JavaScript tools written in Rust
oxc.rs
December 1, 2025 at 3:43 PM
Reposted by Alexander Lichter
connorshea.bsky.social
The effort on oxfmt has been really incredible to watch. I tested the alpha on the bsky codebase and it fully formatted every single JS/TS/TSX file identically to Prettier 3.7! :D
December 2, 2025 at 4:24 AM
thealexlichter.com
A new formatter enters the ring 👀
voidzero.dev VoidZero @voidzero.dev · 25d
Announcing Oxfmt Alpha! 🚀

We’re excited to announce the alpha release of Oxfmt, our Rust-powered formatter.
We designed Oxfmt to be easily adoptable, especially for existing Prettier users

More below and in our announcement post voidzero.dev/posts/announ...
Announcing Oxfmt Alpha
Oxfmt is a fast Rust-based formatter that is available now in alpha stage and supports JavaScript and TypeScript files. It is 30x faster than Prettier while having >95% compatibility.
voidzero.dev
December 1, 2025 at 5:39 PM
Reposted by Alexander Lichter
voidzero.dev
Ever since we announced Vite+, the excitement, and the questions, have been rolling in.
We took some time to answer the most common ones and also added them at the end of the Vite+ announcement post.
Announcing Vite+
Introducing Vite+, a unified toolchain for JavaScript.
voidzero.dev
November 28, 2025 at 7:48 PM
Reposted by Alexander Lichter
sxzz.dev
🚀 tsdown just hit 3k stars on GitHub!

Thank you all for your amazing support!
November 28, 2025 at 4:42 AM
Reposted by Alexander Lichter
voidzero.dev
Instead of providing your tsconfig manually in @rolldown.rs, you can now enable @vite.dev like automatic resolution.

◇ Finds the nearest tsconfig.json
◇ Respected by both, resolver and transformer
◇ tsconfig references will be searched as well (given certain criteria are fulfilled)
November 27, 2025 at 4:15 PM
Reposted by Alexander Lichter
voidzero.dev
Want to speed up subsequent @vitest.dev runs?
Then try out the new experimental file-system based cache ✨

⋄ Caches transformed modules
⋄ Does *not* work with browser mode yet
⋄ Can be manually cleared via `vitest --clearCache`

More in the docs
vitest.dev/config/exper...
Vitest’s Experimental FS Cache Enable via CLI or config: `pnpm vitest --experimental.fsModuleCache` First run does not change timings. There is no cache yet! An image with statistics about the test run with 3088 tests passed and 6.17s testing duration, transform taking 5.32s, setup 461ms and collect 18.50s. Subsequent runs use the file system cache, reducing transform times Another statistics image. The subsequent run now takes only 5.14s, with transform time down to 673ms, setup to 341ms and collection time down to 13.20s
November 26, 2025 at 4:36 PM
Reposted by Alexander Lichter
voidzero.dev
Improved require(esm) interop in @rolldown.rs.

Since the last beta, the bundler supports the special `as "module.exports"` keyword and aligns with the @nodejs.org behavior.

Another step towards better interoperability between CJS and ESM, now with bundler support!
Title: Improved require(esm) support Subtext: chunk.mjs defines the return value when used via require by setting it via export `as “module.exports"` Image showing that index.js requires chunk.mjs and logs result: const User = require('./chunk.mjs'); console.log('User:', User); The chunk exports a user class by default, but also via "export { User as 'module.exports' }". --- Screenshot of the a previous Rolldown version showing the console.log that does not log the class but an object with default and 'mode.exports' key. Subtitle: OLD: Use literal exports, no transformation Screenshot of the latest Rolldown version correctly logging that User is a class. Subtitle: NEW: Detection & correct runtime result Three bullet points at the end: * More predictable behavior * Aligns with Node.js * Only relevant for require(esm)
November 25, 2025 at 1:43 PM
Reposted by Alexander Lichter
voidzero.dev
Having a hard time to get a URL for your (relative) assets after bundling?
Then you will enjoy the experimental `resolveNewUrlToAsset` option that is available in @rolldown.rs.

All you need to do is to activate it, and all `new URL('./path/to/file', import.meta.url)` calls will be updated.
Three column layout. First column: "Input" shows an index.ts with the following content ```js const url = new URL('./styles.css', import.meta.url) console.log(url) ``` It also shows a styles.css but its content is not important. Subtitle: Code to get a reliable URL to a local asset Runs everywhere, right? Second column: "Before" index.js: ```js //#region index.ts const url = new URL("./styles.css", import.meta.url); console.log(url); //#endregion ``` Shows a mismatch between the "./styles.css" url and the bundled "./styles-DvhEFzjT.css" tab that is also included in the column. Subtitle: MISMATCH - After bundling, URL does not contain the updated asset name with the file hash. Last column: After Shows a rolldown.config.ts that enables `experimental.resolveNewUrlToAsset`. Then, shows an index.js that now has the right reference to the bundled css file, "assets/styles-CjdrdY7X.css": ```js const url = new URL("assets/styles-CjdrdY7X.css", import.meta.url); console.log(url); ``` Subtitle: With the experimental option, relative assets are now referred to correctly ✅
November 21, 2025 at 4:03 PM
Reposted by Alexander Lichter
boshen.github.io
Oxlint enabling type checking straight out of tsgo!

This should speed up the slow `tsc --noEmit` step in large repos.

PR: github.com/oxc-project/...
November 20, 2025 at 3:47 PM
Reposted by Alexander Lichter
erus.dev
Vitest 4.0.11 adds an experimental `fsModuleCache` flag to cache module transforms between reruns. Learn more: vitest.dev/config/exper...

This is an opt-in feature, please let us know how it works for you!

And example of a single test file that imports a lot of files (~1500). Almost a 50% boost!
A screenshot of Vitest terminal showing the times for two runs. The first run takes 9.65s, the second run takes 5.90s.
November 20, 2025 at 12:04 PM
Reposted by Alexander Lichter
voidzero.dev
Did you know that you can match against Standard Schemas in @vitest.dev?

With the release of Vitest 4, this is possible now. No matter if you want to match your whole data or only partials against a schema and no matter which validation library is used as long as they support Standard Schema
Title: Match against Standard Schema in Vitest Code ```js import { it, expect } from "vitest"; import * as v from "valibot"; import * as z from "zod"; const schema = v.object({ name: v.string(), age: v.number(), email: v.pipe(v.string(), v.email()), }); it("should match the schema", () => { const user = { name: "Jane Doe", age: 42, email: "youshoulduse@vitest.dev", }; // Validate the entire object expect(user).toEqual(expect.schemaMatching(schema)); // Also works for validating partial data expect(user).toEqual({ name: 'Jane Doe', age: 42, email: expect.schemaMatching(z.string()), }); }); ``` Result when running Vitest: Test passing.
November 19, 2025 at 3:40 PM
Reposted by Alexander Lichter
nativescript.bsky.social
On Cloud 9.0 😶‍🌫️
Release details ⇣
November 19, 2025 at 1:31 AM
Reposted by Alexander Lichter
wordman.dev
After an amazing time as a Developer Advocate for JS/TS at @jetbrains.com, I'm officially moving to AI advocacy!
Honestly couldn't be more excited to fully dive into everything going on in that space!

We're also hiring a new Developer Advocate to take over! Link 👇
November 17, 2025 at 3:17 PM