Landed initial support for ESM in Node.js SEA: github.com/nodejs/node/... Similar to CJS entrypoints, it only supports importing builtins, so generally require bundling. @nodeland.dev is working on support for VFS in SEA that will unlock loading other modules within SEA github.com/nodejs/node/...

Failed catastrophically at the “don’t look at GitHub” weekend challenge. But on the bright side…

Started iteration on ESM support in the Node.js embedder API with new overloads that likely will be less prone to ABI breakages as more features are added.. github.com/nodejs/node/... Initial support has released in 25.6.0 nodejs.org/en/blog/rele...

This was fun to hack on - a gdb unwinder for V8 JIT-compiled frames on x64. chromium-review.googlesource.com/c/v8/v8/+/75... Also interesting to learn this trick from the gdb source: caller's rsp before call = callee's rbp + 16, and this seems to be a conventional CFA in debuggers

I think I figured out what's going on. Here is another blog post about tinkering with Node.js Core on ARM64 Windows (and tips about reducing the wait time on Windows) joyeecheung.github.io/blog/2026/01...

New blog post on the journey of the new --build-sea flag and how SEA injection works joyeecheung.github.io/blog/2026/01...

This just landed! Thanks @addaleax.bsky.social and @legendecas.bsky.social for the reviews! It will be out in the next semver-minor release of 25, and likely backportable to older LTS - the new workflow is a compatible improvement to the existing postject-based SEA building workflows from v18.x.

Good read. A submission to the European Commission's call for evidence on Towards European Open Digital Ecosystems (importance of OSS for EU tech sovereignty, security and competitiveness). It ends with: > If you work in OSS, consider adding your voice. The feedback period ends February 3, 2026.

Now is the time to realize I have been compiling with host arch = x64 the whole time because for whatever reason I have been using x64 python the whole time to run the configure script 😅

This release contains a bunch of PRs I recently submitted to mark features I contributed to as stable/release candidate. Here is a thread about them 🧵:

This is a mitigation, not a guarantee. Stack space exhaustion recovery is NOT specified by ECMAScript. V8 does it on a best-effort basis. If the recursion depth can be controlled by attackers, explicitly limit the depth. This is what the React and Next.js teams fixed in vercel.com/kb/bulletin/....

We appreciate your patience and understanding as we work to deliver a secure and reliable release. Updates are now available for the 25.x, 24.x, 22.x, 20.x Node.js release lines to address: - 3 high severity issues - 4 medium severity issues - 1 low severity issue nodejs.org/en/blog/vuln...

The Node.js package configuration guide is now live! 🎉 Whether you're creating your first package or migrating to ESM, this guide walks you through it with examples. https://nodejs.github.io/package-examples

Finished two retrospective blog posts on the journey of require(esm) before 2025 ends: joyeecheung.github.io/blog/2025/12... joyeecheung.github.io/blog/2025/12...

Made some progress in my hobby project 🎄 Moving single executable application building into Node.js core for better UX/DX, currently works on macOS and Linux and open for feedback! (No Windows yet because I don't take another laptop with me on vacation 😅) github.com/nodejs/node/...

Good news: I am leaving cold and rainy weather for vacation Bad news: it looks like the location I picked is still cold and rainy (just slightly less so)

When the reproducibility of a serialized object breaks and 1. It doesn’t show up in debug builds 2. There is no obvious pattern in how the bits change Then that might be an uninitialised padding (Spent a couple of hours trying to fix this again…after I forgot how I fixed something similar before)

Does LLVM produce slower RISC-V code than GCC? Currently, yes. Can we make LLVM produce faster code? Also, yes! lukelau.me/2025/12/10/c... #llvm #riscv

Working in an enterprise setup with corporate proxies or custom CAs? Node.js has native support for that. No external dependency required, just configure and continue 👍 Details: https://nodejs.org/en/learn/http/enterprise-network-configuration

WIP guide on making Node.js work in an enterprise network environment… github.com/nodejs/nodej... ⚒️

The changed code is a small fraction of an open source contribution. Your commitment to understand the issue, how your proposed solution fits with the project, and be ready to own and push the review process forward is the biggest chunk of the work. Your effort is the contribution, not the code.

Bumping the stability of a bunch of Node.js features that I've been contributing to...(some of them are about the time; some of them are just forgotten to be promoted to stable 😅)

Got my new passport and said goodbye to the old one that was full 😬 Anecdote: I got my first passport to give a talk at NodeJS interactive in Austin, that was my first trip abroad, my first conference, my first conference talk, and my first English talk all at the same time

Touring/climbing steps in Chongqing

Today I gave a talk at JSConf JP covering the implementation story of recent Node.js module loader changes (compile cache, require(esm) and synchronous loader customization hooks). Very lovely conference! Slides: github.com/joyeecheung/...

Preparing my talk for JSConf JP and I finally drew my mental venn diagram about how Node.js development works 🤪

In an unexpected turn of events, this helped me reproduce a bug that can only be reproduced in a Linux arm64 container (not in bare-metal Linux arm64, or any other containers on other platforms 😅)

Uploaded a demo on how to use nodejs/devcontainer! - Testing a mounted dev branch on a different OS - No need to build V8 from scratch on a fresh checkout (usually) - Testing third-party code with the dev branch in a container www.youtube.com/watch?v=3Nwa... PR: github.com/nodejs/node/...

TIL git-restore-mtime, which is very handy when mounting a local clone to a clone in a docker container while still reusing the build cache from the docker image 😇 (otherwise all the files from the local clone would be too fresh and invalidate the build cache in the container)

Built-in HTTP proxies are now on v22 😇 (Going to update the version mentions in a WIP guide on using Node.js in enterprise network environments)

Stalled this PR for almost a year due to CI build cache issues, last week I realized (once again?) the Linux binary size is a bit out of hands and gave the CI another try, and the CI miraculously handled it , so finally landed this and shed of 8MB off the binaries at least github.com/nodejs/node/...

"No more juggling CommonJS and faux-ESM." - @joyeecheung.bsky.social revealed how @nodejs.org is moving to full ESM and why the future looks brighter for developers. www.youtube.com/watch?v=I0jv...

Girl got desperate looking at the CI

No more juggling CommonJS and faux-ESM. @joyeecheung.bsky.social revealed how Node.js is moving to full ESM and why the future looks brighter for developers. #NordicJS #NordicJS2025

I gave a talk today at @nordicjs.com about shipping Node.js packages in 2025...or how to transition from shipping dual/faux-ESM/CommonJS to shipping ESM directly! Slides at github.com/joyeecheung/...

Igalia's @joyeecheung.bsky.social will be speaking about "Shipping Node.js packages in 2025,” focused on migrating dual/faux/CJS packages to ESM-only at Nordic.js on Friday, 3rd October at 10:30 CEST nordicjs.com/2025/speaker... Come say hi!

Whenever I travel to a place where dinner starts at normal time I always feel that I've gained at least 3 extra hours per day and there are actually things I can do at night again

Me: why is it taking forever to git clone when I am trying to build a docker container, what's wrong with my docker configuration (a few moments later) Oh I forgot I am doing it a home where the connection to GitHub is just outrageously slow 😭 the wrong is in my provider

I tried not to look at GitHub on this special day and I failed already during breakfast....🥲 I blame this breakfast for taking too long to serve and I got bored!

Landed the configurations as "execArgv" and "execArgvExtension" ("none" | "env" | "cli"), expected to go out in v24.7.0! github.com/nodejs/node/... github.com/nodejs/node/...

Got two PRs to my fork of Node.js with AI generated nonsense in the past two weeks 🤨 I get that AI spam is common these days but why my fork?

Haven't tried to generate core dumps on macOS for a local build for quite some time and just found out that the executable now must be signed with com.apple.security.get-task-allow entitlement to be dumped nasa.github.io/trick/howto_...

RFC: We are adding support for execution command line flag in Node.js single-executable applications. What do you think about this configuration? github.com/nodejs/node/...

Trying to deflake a test that was written 12 years ago...

We're kicking this Bluesky party up a notch 🎉 and here to give developers what they want (what they really, really want)! What Chrome features and topics would you like to learn more about?

Node excitement 😉 Congrats to @marcoippolito.dev on today's landmark Node 22.18 release. It is the first LTS release to ship unflagged TypeScript support 🎉 This means Node can run *.ts files. It pairs well with TypeScript's "erasableSyntaxOnly" flag 👍 Many folk contributed 🙏

Node.js 24.5.0 is out: built-in proxy support for `node:http(s)`, experimental WASM modules, upgraded OpenSSL version and so much more. Full changelog and download links at nodejs.org/en/blog/rele...

Encountered a 4 hour delay of the flight and ended up staying in a hotel in Santiago because it’s already past 2am after I got out of the airport. Well, might as well spend a weekend? 🤨

Forgot to remind the border guard to reuse already stamped pages for stamps and now I lost one more blank page on my passport which is already running out of blank pages for visas….😖

TypeScript excitement 😉 TS 5.9 RC is out 🎉 🔶 `import defer` by @nicr.dev 🔶 module: "node20" for require(ESM) 🔷 --init has modern defaults (no downleveling) 🔷 Docs: Inline summaries for DOM APIs 🔷 IDE: Expandable hovers to drill into Quick Infos 🔷 Perf: Faster type instantiation & file existence