Hello friends and welcome to another “how’s ESM vs CJS doing?!” A big win this time, at a year of `require(esm)` available! 38.0% of the popular npm packages now have ESM, up from 33.4% half a year ago. ESM-only is up from 12.6% to 16.0%. Particularly this non-dual, “vanilla” growth is very big!

Wait… Vite+ DevTools are here?! @antfu.me is on fire 🔥

magic-string v1.0.0 gets released with pure-ESM, thanks to @sxzz.dev!

Release v1.0.0 · Rich-Harris/magic-string

In magic-string v1.0.0, it's now pure ESM, and the type declarations are built from the TypeScript source. This means the previous CJS, UMD, and IIFE builds are now dropped as we believe the ecosys...

github.com

wouldn't it be nice if sites could share a cache of common js? ... stuff like react, or vue or svelte? 👉 there's an early stage proposal for cross-origin storage which enables exactly this. there are challenges but I think it's very interesting indeed

GitHub - WICG/cross-origin-storage: Explainer for the Cross-Origin Storage (COS) API

Explainer for the Cross-Origin Storage (COS) API. Contribute to WICG/cross-origin-storage development by creating an account on GitHub.

github.com

My experience with agents is that it doesn't make my work "faster". In the end it costs roughly the same amount of time, if not longer But my role has shifted from "builder" to "sculptor", which is a completely different job. I hated it at the very beginning tbh, but I'm getting better at it slowly

That said, there’s still some friction for people to start benefiting from agents, and the cost can be a barrier. If you’re actively contributing to OSS and want to use agents to help with your work, DM me with your contributions or plans. I’d be happy to sponsor your agent bills for a few months.

Anthony Fu@antfu.me · last mo.

I want to say thanks to @hyf0.bsky.social, who wrote me a long email back then explaining the benefit of using agents, with a $100 sponsorship for me to try them. It has significantly changed my attitude and workflow (still exploring the best practices tho, hopefully to be able to share soon).

I want to say thanks to @hyf0.bsky.social, who wrote me a long email back then explaining the benefit of using agents, with a $100 sponsorship for me to try them. It has significantly changed my attitude and workflow (still exploring the best practices tho, hopefully to be able to share soon).

Over the years, in Vue, we have added a lot of dev only warnings at runtime to help developers With @antfu.me we want to improve these with structured diagnostics: enforcing good practices for errors and pretty print output that is actionable (agents autofix cheat code) Say hello to nostics.dev

My @sli.dev plugin for @jetbrains.com IDEs is live (alpha). Auto-detects your slides.md, manages the dev server, completion in the editor, live preview, navigation to imported slides, syntax highlight for magic-move, quick docs for front matter... plugins.jetbrains.com/plugin/32201...

Introducing CoHub: a simple way to visualize the connection between two GitHub users. Enter two usernames to discover their shared organizations and the repositories they’ve both contributed to or starred.

@antfu.me & @sxzz.dev really have a close connection!

npm increasingly feels like a zombie org under GitHub. As someone who's been around the JS ecosystem and part of multiple OSS orgs for years, what I'm seeing isn't just "big co moves slow." It's quiet neglect of critical infrastructure the entire JS world runs on. A short thread 🧵

What do you think of a dev tool that helps you inspect components in your live app and then save that snapshot as a story in Storybook? 🤔 Backed by the incredible Vite devtools of course @antfu.me <3

I share so many feelings with what @acemarke.dev wrote in this post. I got saved a lot. I was thinking about writing a similar post myself, but apparently Mark goes much further and deeper than what I have experienced. It’s a long read, but I highly recommend taking the time to sit down and read.

Mark Erikson@acemarke.dev · 3mo ago

I wrote about everything I've felt, feared, and experienced about using AI for code over the last few years, and my opinions on where we stand. It's the most personal thing I've ever written. And I'm putting it out there to share with all of you. blog.isquaredsoftware.com/2026/05/ai-t...

In node-modules-inspector@2.1.0, we added a new report page "Maintainer Actions", which lists actionable changes for package maintainers to move the ecosystem forward. With pre-constructed prompts to copy if you want agents to do that for you. github.com/antfu/node-m...

code is also cheap.

Met the most wonderful person in the world 🤍

`tsnapi` - a snapshot testing utility for the public API for library maintainers. Snapshots for both JavaScript and TypeScript declarations. It would help prevent unintended breaking changes on public API signatures. Thanks @sxzz.dev for the initial idea and implementation. github.com/antfu/tsnapi

After years of working in silos, in 2024 @netlify.com, @cloudflare.social, OpenNext, Google @firebase.com, and the @nextjs.org team at @vercel.com built bridges. We started discussing how to truly solve for full portability of Next.js. And we kept at it. Today marks a culmination of this work.

Next.js Across Platforms: Adapters, OpenNext, and Our Commitments

Next.js 16.2 introduces a stable Adapter API, a public adapter test suite, and a working group for more consistent deployment across platforms.

nextjs.org

Netlify@netlify.com · 4mo ago

The Next.js Adapter API is now stable. That’s a big step toward running @nextjs.org across platforms. However, there's still work ahead and that's why we're forming the Ecosystem Working Group. @philippeserhal.com shares what’s next: www.netlify.com/blog/the-nex...

It has been a very long while since I was posting on social media. I kinda want to get back into it and share more, but I feel like I've lost the momentum. I'll try to get it back on track.

Every Slidev power user ends up writing a custom picker script for their talks repo. @antfu.me has one. I had one. So I packaged it properly. slidev-decks: TUI deck picker, fuzzy matching, scaffold wizard, build --all, pm detection, slidev CLI pass-through. github.com/afonsojramos/slidev-decks

GitHub - afonsojramos/slidev-decks: CLI companion for managing multiple Slidev presentations

CLI companion for managing multiple Slidev presentations - afonsojramos/slidev-decks

github.com

This day 4 years ago I sent my first PR to @vitest.dev. Back then it was on v0.7.4 with 80K weekly downloads. After one year and +70 more PRs, @antfu.me and @erus.dev invited me to join the team. Today we are at v4.1.0 with 35M weekly downloads. Maybe in 2030 we'll have Vitest 8 with 140M downloads.

test(reporters): add outputFile tests by AriPerkkio · Pull Request #978 · vitest-dev/vitest

Adds missing test cases for outputFile configuration. I'm working on another bug fix and thought let's merge these ones first.

github.com

simply, more OSS projects should DO THIS. OSS is a long playing game, if not forever. but we are people behind those projects, and we need good rest and balance to keep things sustainable. I am super happy to see this move and looking forward to see how it could change how OSS works for all of us.

npmx@npmx.dev · 6mo ago

see y'all in a week 👋

late to the party. I have finally been convinced by multiple awesome developers to give agents another try. this is my first premature contribution: github.com/antfu/skills

GitHub - antfu/skills: Anthony Fu's curated collection of agent skills.

Anthony Fu's curated collection of agent skills. Contribute to antfu/skills development by creating an account on GitHub.

github.com

👀

feat: add official skills by antfu · Pull Request #2447 · slidevjs/slidev

Add generated skills from the docs with Claude Code To give it a try: npx add-skill slidevjs/slidev

github.com

for a little bit of context, I build tools for humans for better dx or productivity, and I consider it a creative work, so I am not worried at all about "being replaced by ai" what I am concerned is the tools' target users. if people no longer care about user-experience but more on "ai-experience"

Anthony Fu@antfu.me · 7mo ago

is it still relevant?

is it still relevant?

TIL that the tailwinds docs are not open source. It is the first time I see a popular OSS project with this kind of non-license approach for their docs. Are there other examples out there? Maybe I missed them too assuming that docs followed the same license as their code.

😇❓

Bjorn Lu@bluwy.me · 8mo ago

Curiosity got the best of me. Looks like all of them are students from www.newtonschool.co/newton-schoo.... Probably targeting a few repos as an "assignment".

Don't even know if I should build some LLM-powered tools to fight back magic with magic, or if I should just quit altogether. Agents create the illusion that you can accomplish complicated work with simple prompts, and people become less appreciative of the hard work behind the scenes.