Jon Kuperman
@jonkuperman.com
TC39 - Signals - Source Maps - TS/JS @Bloomberg. Previously I did web at Adobe and Twitter.
Opinions are my own.
Opinions are my own.
Reposted by Jon Kuperman
If you didn’t want me doing it you shouldn’t have named it megamorphic
August 14, 2025 at 2:41 PM
If you didn’t want me doing it you shouldn’t have named it megamorphic
Don't mind me, just hiding my event listeners from the DevTools
November 19, 2025 at 2:41 AM
Don't mind me, just hiding my event listeners from the DevTools
✅ overnight flight
Now just gotta kill *checks watch* 8 hours before I can check into my hotel
Now just gotta kill *checks watch* 8 hours before I can check into my hotel
November 14, 2025 at 11:29 PM
✅ overnight flight
Now just gotta kill *checks watch* 8 hours before I can check into my hotel
Now just gotta kill *checks watch* 8 hours before I can check into my hotel
This is… I mean it’s… I’m not sure where to start finance.yahoo.com/news/coding-...
Coding assistant Cursor raises $2.3bn five months after its previous round
Cursor plans to use the capital to continue developing Composer, the AI model the vibe coding startup released in October.
finance.yahoo.com
November 13, 2025 at 3:09 PM
This is… I mean it’s… I’m not sure where to start finance.yahoo.com/news/coding-...
@jason.energy listening to your Finland Spotify playlist today
November 13, 2025 at 11:06 AM
@jason.energy listening to your Finland Spotify playlist today
This always cracks me up
November 12, 2025 at 4:00 PM
This always cracks me up
This has been such an amazing journey to watch. Huge congratulations (and thanks) to everyone who made this possible!
Node excitement 😉
Congrats to @marcoippolito.dev on making it official: type-stripping in Node 25 is now declared to be stable 🎉
You can run: node index.ts
The capabilities have not changed since Node 24. This is purely a maturity indicator.
Congrats to @marcoippolito.dev on making it official: type-stripping in Node 25 is now declared to be stable 🎉
You can run: node index.ts
The capabilities have not changed since Node 24. This is purely a maturity indicator.
Type stripping is now stable.
Enjoy 🌞
Enjoy 🌞
November 12, 2025 at 10:23 AM
This has been such an amazing journey to watch. Huge congratulations (and thanks) to everyone who made this possible!
Escaping Reactivity Hell & Managing State in React
YouTube video by CascadiaJS
youtu.be
November 11, 2025 at 2:10 PM
Is this a dentist’s office or a psychology experiment?
November 11, 2025 at 1:10 PM
Is this a dentist’s office or a psychology experiment?
Reposted by Jon Kuperman
Yesterday at TPAC I publicized my draft proposal for adding a declarative templating API to the DOM.
github.com/justinfagnan...
The repo has:
📖 Explainers for the templating API and DOM scheduler API
🏗️ Full prototype implementations
⚗️ a JSX transform
⚛️ a mini React-like framework
github.com/justinfagnan...
The repo has:
📖 Explainers for the templating API and DOM scheduler API
🏗️ Full prototype implementations
⚗️ a JSX transform
⚛️ a mini React-like framework
github.com
November 10, 2025 at 11:04 PM
Yesterday at TPAC I publicized my draft proposal for adding a declarative templating API to the DOM.
github.com/justinfagnan...
The repo has:
📖 Explainers for the templating API and DOM scheduler API
🏗️ Full prototype implementations
⚗️ a JSX transform
⚛️ a mini React-like framework
github.com/justinfagnan...
The repo has:
📖 Explainers for the templating API and DOM scheduler API
🏗️ Full prototype implementations
⚗️ a JSX transform
⚛️ a mini React-like framework
Really spoiling my LLM today by letting it make as many summaries as it wants
November 7, 2025 at 3:39 PM
Really spoiling my LLM today by letting it make as many summaries as it wants
In too deep. Writing Python. Send help.
November 5, 2025 at 9:47 PM
In too deep. Writing Python. Send help.
my manager found my subskeets 😱
November 4, 2025 at 3:56 PM
my manager found my subskeets 😱
This train will be calling at Brighton, Sutton, Bunnyoncarrot, Widdlecity, Three Bridges, Eight Roads and Gatwick Airport.
November 4, 2025 at 9:00 AM
This train will be calling at Brighton, Sutton, Bunnyoncarrot, Widdlecity, Three Bridges, Eight Roads and Gatwick Airport.
Decided I'm going to be a ghost for halloween... but only in spirit.
November 1, 2025 at 1:34 PM
Decided I'm going to be a ghost for halloween... but only in spirit.
The fact that Bluesky lets you simply save an image to your phone with no ads or branding feels so good
October 31, 2025 at 3:05 PM
The fact that Bluesky lets you simply save an image to your phone with no ads or branding feels so good
I built a fun Spanish learning app this morning, check it out! linguabot.pages.dev
LinguaBot - Master Spanish with AI-Powered Practice
Learn Spanish through AI-powered synonym challenges and speech practice. Master confusing Spanish words with instant feedback and personalized learning.
linguabot.pages.dev
October 25, 2025 at 3:24 PM
I built a fun Spanish learning app this morning, check it out! linguabot.pages.dev
New overground trains appear to be standing room only
October 24, 2025 at 11:44 AM
New overground trains appear to be standing room only
The best way to deploy software
October 23, 2025 at 3:25 PM
The best way to deploy software
I’m just going to assume the aws outage was caused by a paragraph overflow attack because damn
October 23, 2025 at 2:30 PM
I’m just going to assume the aws outage was caused by a paragraph overflow attack because damn
I mean, it’s not wrong
October 23, 2025 at 2:09 PM
I mean, it’s not wrong