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Works On My Machine

Debugging, environment drift and bugs that only happen elsewhere

t/works-on-my-machine

Bugs that vanish the moment someone else looks. Heisenbugs, environment drift, and the eternal "but it passed locally".

20 members
5 posts
Created Aug 2026

Community rules

3 rules for t/works-on-my-machine

  1. Post the diff between the two machines

    Node version, OS, env vars, lockfile. The gap is always in there somewhere.

  2. Bring the detail

    Versions, error text, what you already tried. "It does not work" is not a question anyone can answer.

  3. No drive-by self promotion

    Share your own work when it answers the thread. A link with no context is a advert, and it gets removed.

Top contributors

  1. Trần Phương Thảo#1 · 38 rep · 1 post
  2. Guillaume Mercier#2 · 36 rep · 1 post
  3. Sayan Mukherjee#3 · 33 rep · 1 post
  4. Kelechi Nnaji#4 · 33 rep · 1 post
  5. Siobhan O'Rourke#5 · 10 rep · 1 post

Discussions

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Showing 5 posts.

Posts in t/works-on-my-machine

Guillaume Mercier1.6K
t/works-on-my-machine2 min

Docker was supposed to kill "works on my machine". Now it works on my container.

Bon. Story of my Tuesday, because I need to complain and also because maybe it saves someone 3 hours. New colleague, new MacBook with an M3. He builds our Symfony image on his machine, tests it, everything works, and he pushes the image to the registry from his laptop because "CI is slow" (it is, but this is not the point). Deploy on our servers. Container starts and dies directly: exec…

9

  • Sam Whitaker
    works on my machine evolved into works on my architecture. next year: works on my planet
Trần Phương Thảo1.1K
t/works-on-my-machine2 min

I blocked the release on Friday and whole team look at me like I kill their cat

Story time 😅. Friday 4pm, release for our Australian client at 5pm. Everything is green. Dev team already ordered bubble tea to celebrate. I do my last check on real device, the old Android phone that nobody want to use. Checkout button not work. Tap, nothing happen. On iPhone fine, on Chrome desktop fine, on the dev laptop of course fine. "Works on my machine" 3 times in 10 minutes. I write in channel: "Release…

12

  • Kuya Migs
    Respeto, Thao. Sa Pilipinas maraming users naka-old Android pa rin, so ganito talaga lagi. Bookmarking "syntax gets transpiled, methods need polyfill" para sa mga students ko 💪
  • Priya Rawat
    same same 🙂 friday ko release block karo toh sab dushman, monday ko sab dost
Siobhan O'Rourke104
t/works-on-my-machine2 min

the renewal test that only failed one night a year

promised this one ages ago so here it is. We had an end to end test for policy renewals. It ran every night at half twelve: create a policy starting today, jump forward a year, check the renewal quote and the end date. Green for months. Then one night at the end of October it went red, a policy that started on the 26th came out with an end date of the 25th the following year. Next night green again. Classic flake,…

3