Peter Kellner
@pkellner.bsky.social
Pluralsight author focusing on React. Silicon Valley Code Camp organizer.
@karaswisher.bsky.social @profgalloway.com @pivotpod.bsky.social I can’t believe that you said the Supreme Court stays away from interfering with state supreme courts. Bush v Gore? I can’t think of a more consequential override. How is this different?
I often check to see what’s new on the React blog, and it would be nice to see some positive news instead of always seeing this. react.dev/blog/2025/12.... @react.dev
Denial of Service and Source Code Exposure in React Server Components – React
The library for web and native user interfaces
react.dev
Updating passwords to mysql use to be a hassle until AI helped writing all those crazy scripts. best practices is one user/password per catalog. That's a lot of users and passwords! peterkellner.net/2025/12/31/a...
Using AI to Create Secure MySQL Password Rotation Scripts (Without Exposing Secrets) | Peter Kellner's Blog
How to leverage AI assistants to build password management scripts while keeping your actual credentials completely private.
peterkellner.net
Learnings From Coding with AI (Claude Code): This may be my last in this series (if anyone is listening). At ReactConf, I learned a lot (including from @leerob.com) and have switched From CC to Cursor. So far, the honey moon is going great! I need a new name "Learnings From ??:" Suggestions?
Learnings From Coding with AI (Claude Code): I wish Claude Code was like a junior programmer in that when you teach it something, it remembers the technique for the next time. for me, it's like groundhog day, everyday.
Learnings From Coding with AI (Claude Code): It's hard to believe there isn't some thinking going on here. Claude admits its fallacies.
Only in New York, at JFK checking in, told the lady that my extra bike charge of $200 was nothing compared to the hotel for 450 last night. She said they should’ve bathed you for that much.
Learnings From Coding with AI (Claude Code): "Are you again adding useEffect when you should be calculating values form existing state, and understanding that state changes cause un-needed re-renders?". I'm so tired of saying this even though I have it clearly in my `claude.md` file.
Learnings From Coding with AI (Claude Code): When seeing context available at the bottom get low (like less then 5%), don't think about asking another question that might lead to "compacting...". Nothing ever comes out right for me after compacting. Do: /clear and restart conversation fresh.
Learnings From Coding with AI (Claude Code): I use to have more faith and even wanted a more headless experience with CC. Now, I've learned to watch it carefully and constantly type feedback as it does stuff. It apprecaites it :). CC: "now I understand the problem better, thanks for clarifying"
Learnings From Coding with AI (Claude Code): Not exactly a learning, but I wish Claude Code would learn from what I tell it. I makes the same mistakes over and over and over. Maybe @anthropic.com will someday, or someone else like @openai.com will.
Learnings From Coding with AI (Claude Code): "I see the issue! The isPaused prop only affects the DISPLAY - it doesn't actually stop the status checking". Always be extra extra clear when asking for updates. It just changed the button labels, not the functioning
Learnings From Coding with AI (Claude Code): Does it bother anyone else that CC iterates until it gets a successful compile and then declare it working? (that is, when node and typescript at least). I have to explicitly tell it to write tests which it often doesn't like to do.
Hey follow claude code travellers @anthropic.com, I've been posting "Learnings From Claude Code" for quite a while and not getting much/any traction. Any suggestions?
Learnings From Coding with AI (Claude Code): "The problem is in phase1-metadata-discovery.ts. Someone added a misguided "optimization" that blindly adds all child folder metadata paths". Guess who "someone" was
Learnings From Coding with AI (Claude Code): When I find a code problem, I make CC build a test to demonstrate the problem and the failure. Then I make it fix that test to work. Then iterate on this: " Hmm, my test isn't reproducing the exact bug."
Learnings From Coding with AI (Claude Code): Claude Code does not think like us. I find it often undoes what I asked it to do in a previous context if my next request touches that. It doesn't remember why it did, it just does again as if it were a robot (wait, it is a robot)
Me: Never ever ever have code that "adds a small delay". that is just really bad programming style, indicating the developer is an idiot and lazy which you are not. Claude Code: You're absolutely right. Let me fix this properly by removing that terrible delay.
Learnings From Coding with AI (Claude Code): To those who think serious architecture skills are not need to build apps with AI, read this planning doc I wrote for a refactor. It took an initial rough prompt of what I wanted, then about 20 refinements. gist.github.com/pkellner/06b...
A plan I created in Claude Code to do a significant refactor
A plan I created in Claude Code to do a significant refactor - REFACTOR-HIERARCHY-JS.md
gist.github.com
Learnings From Coding with AI (Claude Code): If you are using Claude Code (like me and paying $200/month), and you are not using context7, you are missing out on the lastest features in the packages you use (like React, Node and Next.js)
Who (besides me) did not know that with @nextjs code like this: import Image from 'next/image' export default function Page() { return ( <Image src="s3.amazonaws.com/my-bucket/x.png” width={500} height={500} /> ) } The image goes thru your own server?
Learnings From Coding with AI (Claude Code): CC can create complex architectures and still needs humans to help. I posted a long paragraph of good senior guidance, and it responded: "You're absolutely right! The current architecture is indeed convoluted. Your proposed solution is much cleaner:"
Learning From Coding With AI (Claude): OMG! started using Claude Code. OMG OMG OMG!!! I've paid the $200. I'd pay more. I can't believe how much this makes what I was doing with cutting and pasting feel like I was living in ancient times. Mind blown.
react.dev
Learning From Coding With AI (Claude): Todays learning is that for relatively new tech like React's useActionState, react.dev/reference/re..., even when you give claude the doc link, it still really screws up the implementation adding all kinds of crazy extra useState and useEffect calls.
useActionState – React
The library for web and native user interfaces
react.dev
@karaswisher.bsky.social and @profgalloway.com I was so sure you were going to continue today when you use the professional wrestling analogy, and point out this is all staged just like that. I was expecting Scott to say check who made money when the stop dropped.
