Carlos Fuentes
@metcoder.dev
Node.js Collaborator | Open Source Maintainer | Currently Auth0/Okta
Just another guy playing to be a software engineer
🇳🇱 Amsterdam
Just another guy playing to be a software engineer
🇳🇱 Amsterdam
Pinned
Major thanks to lambdatest.com for becoming a Bronze Sponsor of Piscina.js 🙏
It ensures we can dedicate time to critical maintenance and new features.
Thank you! Learn more about our sponsors: piscinajs.dev
#oss #Community #piscinajs
It ensures we can dedicate time to critical maintenance and new features.
Thank you! Learn more about our sponsors: piscinajs.dev
#oss #Community #piscinajs
LambdaTest - AI Powered Testing Tool | AI Testing Agents On Cloud
Power your software testing with AI and cloud. Test intelligently, deploy and scale faster with LambdaTest unified testing platform.
lambdatest.com
October 30, 2025 at 9:22 AM
Major thanks to lambdatest.com for becoming a Bronze Sponsor of Piscina.js 🙏
It ensures we can dedicate time to critical maintenance and new features.
Thank you! Learn more about our sponsors: piscinajs.dev
#oss #Community #piscinajs
It ensures we can dedicate time to critical maintenance and new features.
Thank you! Learn more about our sponsors: piscinajs.dev
#oss #Community #piscinajs
Reposted by Carlos Fuentes
"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...
- @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...
October 16, 2025 at 8:12 AM
"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...
- @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...
Reposted by Carlos Fuentes
How many years will it take for people to stop this? These requirements are completely useless.
October 19, 2025 at 1:36 PM
How many years will it take for people to stop this? These requirements are completely useless.
Wild PR for WebSocket over HTTP/2 appears:
github.com/nodejs/undic...
github.com/nodejs/undic...
feat(#2458): WebSocket through HTTP/2 by metcoder95 · Pull Request #4540 · nodejs/undici
This relates to...
Closes #2458
Rationale
Implements WebSocket over HTTP/2
NoteExperimental warning is emitted on first usage.
Changes
Features
Bug Fixes
Breaking Changes and Deprecations
St...
github.com
October 3, 2025 at 10:42 AM
Wild PR for WebSocket over HTTP/2 appears:
github.com/nodejs/undic...
github.com/nodejs/undic...
Reposted by Carlos Fuentes
A propos of nothing, it's a completely reasonable thing to not use a company's products, services, and OSS, when their CEO openly supports (and takes selfies with) a world leader who the UN says is currently committing genocide.
September 30, 2025 at 1:25 PM
A propos of nothing, it's a completely reasonable thing to not use a company's products, services, and OSS, when their CEO openly supports (and takes selfies with) a world leader who the UN says is currently committing genocide.
Reposted by Carlos Fuentes
It reinforces my "AI is a calculator" premise. It helps you come to a correct answer faster and more consistently. But if you don't have the foggiest idea what that correct answer should look like, a calculator ain't gonna make a difference.
September 5, 2025 at 4:52 AM
It reinforces my "AI is a calculator" premise. It helps you come to a correct answer faster and more consistently. But if you don't have the foggiest idea what that correct answer should look like, a calculator ain't gonna make a difference.
Reposted by Carlos Fuentes
Amusing how 99% of people using LLMs forget how these things work:
They are advanced probability machines. They generate the next most likely token (word) based in the input and their training.
Under the hood, it’s a giant matrix multiplication that has eerily good output.
They are advanced probability machines. They generate the next most likely token (word) based in the input and their training.
Under the hood, it’s a giant matrix multiplication that has eerily good output.
September 4, 2025 at 1:47 PM
Amusing how 99% of people using LLMs forget how these things work:
They are advanced probability machines. They generate the next most likely token (word) based in the input and their training.
Under the hood, it’s a giant matrix multiplication that has eerily good output.
They are advanced probability machines. They generate the next most likely token (word) based in the input and their training.
Under the hood, it’s a giant matrix multiplication that has eerily good output.
Reposted by Carlos Fuentes
I'm going to be speaking at JSConf US in October ⭐️ jsconf2025.sched.com/event/26Ubg
JSConf2025: Node.js - What’s New and What’s Next - R...
View more about this event at JSConf2025
jsconf2025.sched.com
August 12, 2025 at 5:41 PM
I'm going to be speaking at JSConf US in October ⭐️ jsconf2025.sched.com/event/26Ubg
and the jar is emptying.
Running out of reasons to keep working in tech. This industry needs a do-over.
August 1, 2025 at 3:01 PM
and the jar is emptying.
I reached AI fatigue faster over any other tech trending over the last 10 years.
It is just... too much.
It is just... too much.
July 31, 2025 at 10:47 AM
I reached AI fatigue faster over any other tech trending over the last 10 years.
It is just... too much.
It is just... too much.
I'm starting to think that I should document more the progress on Piscina; maybe some articles on a blog?
July 21, 2025 at 9:23 PM
I'm starting to think that I should document more the progress on Piscina; maybe some articles on a blog?
I'm amazed by how fast Piscina's tests get after moving to node:test
Thanks @pmarchini for the contribution!
Thanks @pmarchini for the contribution!
June 19, 2025 at 9:14 AM
I'm amazed by how fast Piscina's tests get after moving to node:test
Thanks @pmarchini for the contribution!
Thanks @pmarchini for the contribution!
Reposted by Carlos Fuentes
Open Source is still largely chewing and spitting people out even more so now that it’s harder to get paid to do open source work so it’s fully a second job, but literally all of that code is what is powering the Internet and training your LLMs.
The tech industry doesn’t exist without open source.
The tech industry doesn’t exist without open source.
May 28, 2025 at 10:26 PM
Open Source is still largely chewing and spitting people out even more so now that it’s harder to get paid to do open source work so it’s fully a second job, but literally all of that code is what is powering the Internet and training your LLMs.
The tech industry doesn’t exist without open source.
The tech industry doesn’t exist without open source.
Today's the day, Piscina@v5 is out! 🎉
- Circular Buffer by default
- Load Balancing Customization
- Piscina#runTask deprecation
- Atomics.waitAsync support
and more things came out! Check it out: github.com/piscinajs/pi...
- Circular Buffer by default
- Load Balancing Customization
- Piscina#runTask deprecation
- Atomics.waitAsync support
and more things came out! Check it out: github.com/piscinajs/pi...
Release v5.0.0 · piscinajs/piscina
What's Changed
chore(deps-dev): Bump eslint from 9.22.0 to 9.23.0 by @dependabot in #762
chore(deps-dev): Bump tinybench from 3.1.1 to 4.0.1 by @dependabot in #763
chore(deps-dev): Bump @types/nod...
github.com
May 2, 2025 at 10:26 AM
Today's the day, Piscina@v5 is out! 🎉
- Circular Buffer by default
- Load Balancing Customization
- Piscina#runTask deprecation
- Atomics.waitAsync support
and more things came out! Check it out: github.com/piscinajs/pi...
- Circular Buffer by default
- Load Balancing Customization
- Piscina#runTask deprecation
- Atomics.waitAsync support
and more things came out! Check it out: github.com/piscinajs/pi...
If any of the projects I’ve worked on or contributed to have helped you, I’d really appreciate it if you considered sponsoring my work!
Your support helps me keep building, improving, and maintaining them. Thanks! 💙
github.com/sponsors/met...
Your support helps me keep building, improving, and maintaining them. Thanks! 💙
github.com/sponsors/met...
Sponsor @metcoder95 on GitHub Sponsors
Support My Open-Source Work: Building Faster, Smarter Node.js Tools! 🚀
github.com
March 28, 2025 at 11:39 AM
If any of the projects I’ve worked on or contributed to have helped you, I’d really appreciate it if you considered sponsoring my work!
Your support helps me keep building, improving, and maintaining them. Thanks! 💙
github.com/sponsors/met...
Your support helps me keep building, improving, and maintaining them. Thanks! 💙
github.com/sponsors/met...
Reposted by Carlos Fuentes
This comment by Anders Hejlsberg on the choice of languages for TypeScript is worth reading. Spead that type of thinking! (And recognize the massive shift that Microsoft made)
March 12, 2025 at 9:40 AM
This comment by Anders Hejlsberg on the choice of languages for TypeScript is worth reading. Spead that type of thinking! (And recognize the massive shift that Microsoft made)
Reposted by Carlos Fuentes
Meet our speakers for the upcoming #AmsterdamJSMeetup!
• Lars Straathof - SSR for Web Components, a dead end?
• Jacob Smith - Node Just Run
• @metcoder.dev - Untangling Threads
🗓️ Date: March 6
📍 Location: ING Cedar, Bijlmerdreef 106, 1102 CT Amsterdam
🔗 Register now: lnkd.in/dz9QVwfX
• Lars Straathof - SSR for Web Components, a dead end?
• Jacob Smith - Node Just Run
• @metcoder.dev - Untangling Threads
🗓️ Date: March 6
📍 Location: ING Cedar, Bijlmerdreef 106, 1102 CT Amsterdam
🔗 Register now: lnkd.in/dz9QVwfX
February 25, 2025 at 1:25 PM
Meet our speakers for the upcoming #AmsterdamJSMeetup!
• Lars Straathof - SSR for Web Components, a dead end?
• Jacob Smith - Node Just Run
• @metcoder.dev - Untangling Threads
🗓️ Date: March 6
📍 Location: ING Cedar, Bijlmerdreef 106, 1102 CT Amsterdam
🔗 Register now: lnkd.in/dz9QVwfX
• Lars Straathof - SSR for Web Components, a dead end?
• Jacob Smith - Node Just Run
• @metcoder.dev - Untangling Threads
🗓️ Date: March 6
📍 Location: ING Cedar, Bijlmerdreef 106, 1102 CT Amsterdam
🔗 Register now: lnkd.in/dz9QVwfX
Reposted by Carlos Fuentes
I wrote this article to explain the technical details behind Node.js Type Stripping 👇
satanacchio.hashnode.dev/everything-y...
satanacchio.hashnode.dev/everything-y...
Node.js Type Stripping Explained
Discover everything about Node.js TypeScript integration, the technical details, benefits, and reasoning behind this highly anticipated feature.
satanacchio.hashnode.dev
January 13, 2025 at 10:31 AM
I wrote this article to explain the technical details behind Node.js Type Stripping 👇
satanacchio.hashnode.dev/everything-y...
satanacchio.hashnode.dev/everything-y...
Reposted by Carlos Fuentes
Deno is committed to web standards - that's why we co-founded WinterCG two years ago. Today marks the next step in that journey: WinterCG moves to Ecma International as technical comittee 55 (TC55).
Goodbye WinterCG, welcome WinterTC!
deno.com/blog/wintertc
Goodbye WinterCG, welcome WinterTC!
deno.com/blog/wintertc
Goodbye WinterCG, welcome WinterTC
WinterCG, the Web Interoperable Runtimes Community Group is moving to ECMA as TC55 to be able to publish standards.
deno.com
January 10, 2025 at 2:06 PM
Deno is committed to web standards - that's why we co-founded WinterCG two years ago. Today marks the next step in that journey: WinterCG moves to Ecma International as technical comittee 55 (TC55).
Goodbye WinterCG, welcome WinterTC!
deno.com/blog/wintertc
Goodbye WinterCG, welcome WinterTC!
deno.com/blog/wintertc
It was release day, and the new pre-release version of Piscina was just out of the oven! github.com/piscinajs/pi...
Release v5.0.0-alpha.1 · piscinajs/piscina
What's Changed
chore: add electron to the examples section in docs by @tsekiguchi in #713
chore(deps-dev): Bump neostandard from 0.11.9 to 0.12.0 by @dependabot in #719
chore(deps-dev): Bump c8 fr...
github.com
January 10, 2025 at 9:54 AM
It was release day, and the new pre-release version of Piscina was just out of the oven! github.com/piscinajs/pi...
and hello www.npmjs.com/package/@fas...!
@fastify/otel
Official Fastify OpenTelemetry Instrumentation. Latest version: 0.1.0, last published: 2 minutes ago. Start using @fastify/otel in your project by running `npm i @fastify/otel`. There are no other pro...
www.npmjs.com
January 10, 2025 at 9:32 AM
and hello www.npmjs.com/package/@fas...!
Reposted by Carlos Fuentes
#FreeJavaScript update: Oracle has informed us they won’t voluntarily withdraw their trademark on "JavaScript". Next: they’ll file their Answer and we’ll start discovery to show how "JavaScript" is widely recognized as a generic term and not controlled by Oracle.
January 8, 2025 at 5:41 PM
#FreeJavaScript update: Oracle has informed us they won’t voluntarily withdraw their trademark on "JavaScript". Next: they’ll file their Answer and we’ll start discovery to show how "JavaScript" is widely recognized as a generic term and not controlled by Oracle.
Reposted by Carlos Fuentes
Speaking for myself: yes, when I’m locked on a problem I’ll work more *to get it done.*
But when I regularly pull late nights, my work (+mood, judgement) gets worse, not better.
Best work is (and has been) usually after taking enough rest and being full of energy+motivation.
But when I regularly pull late nights, my work (+mood, judgement) gets worse, not better.
Best work is (and has been) usually after taking enough rest and being full of energy+motivation.
December 18, 2024 at 10:01 AM
Speaking for myself: yes, when I’m locked on a problem I’ll work more *to get it done.*
But when I regularly pull late nights, my work (+mood, judgement) gets worse, not better.
Best work is (and has been) usually after taking enough rest and being full of energy+motivation.
But when I regularly pull late nights, my work (+mood, judgement) gets worse, not better.
Best work is (and has been) usually after taking enough rest and being full of energy+motivation.
Reposted by Carlos Fuentes
This is the way. WebAssembly > Native Addons. For tons of reasons.
(1) V8 is a JS and WASM engine. Perf implications here
(2) Easier to port outside of Node.js
(3) No need to precompile for every arch/os/libc/etc. combo
(4) Smaller packages
(5) Many more....
(1) V8 is a JS and WASM engine. Perf implications here
(2) Easier to port outside of Node.js
(3) No need to precompile for every arch/os/libc/etc. combo
(4) Smaller packages
(5) Many more....
I've spent half a day chasing a segfault... in a native addon :(.
I *really* prefer when tools use wasm vs native bindings whenever possible (thanks to rollup for having a native build).
github.com/rollup/rollu...
I *really* prefer when tools use wasm vs native bindings whenever possible (thanks to rollup for having a native build).
github.com/rollup/rollu...
Segmentation Fault · Issue #5761 · rollup/rollup
Rollup Version v4.28.1 Operating System (or Browser) Linux Node Version (if applicable) v20, v22, v23 Link To Reproduction I'm working on it Expected Behaviour Do not cause a segmentation fault Act...
github.com
December 13, 2024 at 6:59 PM
This is the way. WebAssembly > Native Addons. For tons of reasons.
(1) V8 is a JS and WASM engine. Perf implications here
(2) Easier to port outside of Node.js
(3) No need to precompile for every arch/os/libc/etc. combo
(4) Smaller packages
(5) Many more....
(1) V8 is a JS and WASM engine. Perf implications here
(2) Easier to port outside of Node.js
(3) No need to precompile for every arch/os/libc/etc. combo
(4) Smaller packages
(5) Many more....