Jon Kuperman
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jonkuperman.com
Jon Kuperman
@jonkuperman.com
TC39 - Signals - Source Maps - TS/JS @Bloomberg. Previously I did web at Adobe and Twitter.

Opinions are my own.
January 5, 2026 at 11:51 AM
look at this cool pic of a bird i took
December 22, 2025 at 11:23 AM
when you just finished the gym but ur fav song just came on
December 19, 2025 at 5:38 PM
Average Copilot experience
December 17, 2025 at 11:29 AM
Some day I'll do a thread on the MANY dark patterns the UK TV Licensing website uses to try and trick users. But for today I'll just leave you with this gem
December 11, 2025 at 10:03 PM
lol, uk
December 11, 2025 at 9:59 PM
I’m team nohello.net/en/

That being said, I like to start off with something vague and suspenseful, to set the mood!
December 10, 2025 at 3:12 PM
This feels like bad UX from WhatsApp when you finish a call from a number not in your contacts
December 7, 2025 at 8:22 PM
Can someone help me make sense of this? I'm reading learning.oreilly.com/library/view... and the very first sentence says:
December 5, 2025 at 3:37 AM
So sick of Japan 😤
November 22, 2025 at 6:52 AM
I was curious how browser DevTools are able to "detect" event listeners on a page. I suspected they statically analyze the code looking for `addEventListener` so I tested it out and it does appear to be true!
November 19, 2025 at 5:27 AM
Don't mind me, just hiding my event listeners from the DevTools
November 19, 2025 at 2:41 AM
I love open source
November 18, 2025 at 2:47 AM
This always cracks me up
November 12, 2025 at 4:00 PM
Is this a dentist’s office or a psychology experiment?
November 11, 2025 at 1:10 PM
November 4, 2025 at 2:45 PM
iykyk
October 29, 2025 at 4:04 PM
New overground trains appear to be standing room only
October 24, 2025 at 11:44 AM
The best way to deploy software
October 23, 2025 at 3:25 PM
I mean, it’s not wrong
October 23, 2025 at 2:09 PM
Am I doing this right?
October 17, 2025 at 4:18 PM
TIL I am still not British enough
October 11, 2025 at 2:19 PM
Are there any apps that even come close to being this annoying?
October 10, 2025 at 12:08 PM
I picked up a sushi takeaway and they gave me NINE sets of chopsticks
October 6, 2025 at 2:58 PM
great readme
October 4, 2025 at 11:59 PM