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Joyee Cheung @joyeecheung.bsky.social · 6d

No particular reason other than it seems a bit more common when I skim over the common shipping patterns

Reposted by Joyee Cheung

Nordic.js @nordicjs.com · 6d

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

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Joyee Cheung @joyeecheung.bsky.social · 6d

I think yes! @nordicjs.com

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Joyee Cheung @joyeecheung.bsky.social · 6d

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/...

github.com

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Reposted by Joyee Cheung

Igalia @igalia.com · 8d

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!

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Joyee Cheung @joyeecheung.bsky.social · 9d

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

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Joyee Cheung @joyeecheung.bsky.social · 10d

But that example is pretty extreme, not every CJS exports thousands of names

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Joyee Cheung @joyeecheung.bsky.social · 10d

Ah, that one, there was already an issue and a suggestion to reduce the perf impact if the package provides a wrapper that makes it easier to parse exports: github.com/nodejs/node/...

`import "typescript"` slower than `require("typescript")` due to `cjs-module-lexer` overhead · Issue #59913 · nodejs/node

Version Node.js v24.8.0 Node.js v22.18.0 Platform Observed on macOS (x64), but likely reproducible on other platforms. Description When loading typescript, using import is ~100ms slower than requir...

github.com

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Joyee Cheung @joyeecheung.bsky.social · 10d

…or some heuristics can be used to assume .js in node_modules governed by the same package.json have the same format so that they don’t need to be repeatedly parsed

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Joyee Cheung @joyeecheung.bsky.social · 10d

The issue can be alleviated if more packages explicitly specify the type field; or if the toolchains can reuse the parsed result (e.g. for detecting exports) they could reuse it and not just throw it away after syntax detection.

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Joyee Cheung @joyeecheung.bsky.social · 10d

That is pretty much what Node.js does, except that Node.js does reuse the parsed result because it actually needs to parse it and run it anyway. It warns against results it cannot reuse though (ESM in .js under node_modules without “type” field in package.json).

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Joyee Cheung @joyeecheung.bsky.social · 19d

I noticed, but my connection to GitHub at home has always been slow no matter it’s match day or not 😬

Joyee Cheung @joyeecheung.bsky.social · 20d

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

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Joyee Cheung @joyeecheung.bsky.social · 25d

Yeah it would be odd to say Node.js resent ESM when folks are actively making it less painful to use / ship. At most, there are still wonky edge cases because of technicalities, but bugs always show up when you try to get two very different semantics work together no matter you love them or not.

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Joyee Cheung @joyeecheung.bsky.social · 25d

If there's some enterprise value not represented in a project mostly built by volunteers, the most probable reason is just: no enterprise is investing in the work about this, or not enough. Then it is unlikely to get done by unpaid volunteers in their spare time until investment comes.

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Joyee Cheung @joyeecheung.bsky.social · 25d

Sometimes it's just "people making wishes that won't get done by itself". For example built-in HTTP proxy and system CA support are important for many enterprise users and requested for years, but only added recently because the companies I and another contributor work for are funding the work.

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Joyee Cheung @joyeecheung.bsky.social · 25d

Node.js maintainers come and go; most people active in 2017 are inactive in 2025, and different people have very different views. There isn't a single person or a team who can speak to the value of the project, it's mostly "if you don't like it, submit a PR and convince the people currently around"

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Joyee Cheung @joyeecheung.bsky.social · Sep 3

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!

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Joyee Cheung @joyeecheung.bsky.social · Aug 26

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/...

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Joyee Cheung @joyeecheung.bsky.social · Aug 25

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?

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Joyee Cheung @joyeecheung.bsky.social · Aug 22

o.O It includes China (with a contestant that I might have seen on TV before)

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Joyee Cheung @joyeecheung.bsky.social · Aug 22

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_...

How to Dump a Core File on MacOS (Monterey 12.5)

Trick Simulation Environment. Trick provides a common set of simulation capabilities and utilities to build simulations automatically.

nasa.github.io

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Joyee Cheung @joyeecheung.bsky.social · Aug 12

Or if you are looking into converting other profiles to load in pprof’s visualisations….perhaps www.kvakil.me/posts/2022-0... still works

Converting NodeJS CPU profiles to pprof

www.kvakil.me

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Joyee Cheung @joyeecheung.bsky.social · Aug 12

Samply or xctrace? I wrote some example commands in joyeecheung.github.io/blog/2025/01...

Executable loading and startup performance on macOS

Recently, I fixed a macOS-specific startup performance regression in Node.js after an extensive investigation. Along the way, I learned a lot about tools for macOS and Node.js compilation workflows th

joyeecheung.github.io

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Joyee Cheung @joyeecheung.bsky.social · Aug 11

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/...

"execArgv" field in the SEA config specifies execution flags to be baked into the SEA and applied when it's launched. "execArgvMode" field specifies whether run-time override is allowed. "sealed" for no override, "env" for allowing override from NODE_OPTIONS, and perhaps another value for more powerful override like `--node-flags="--inspect"`.

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