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A web OS that 'never booted': the two bugs that looked like kernel failures but were 404s and z-index
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PUBLISHED : 2026-09-15 (UTC)
AUTHOR    : bartoszosiej
SOURCE    : https://bartoszosiej.github.io/content/aurora-postmortem
PLAINTEXT : https://bartoszosiej.github.io/blog/aurora-postmortem.txt
REPO      : https://github.com/BartoszOsiej/BartoszOsiej.github.io/blob/main/content/aurora-postmortem.md

TL;DR
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  Aurora 'stuck on kernel init' was dist/ being gitignored (GitHub Pages serves the repo, not your build output) — and the follow-up 'icons don't click' was a full-bleed z-index:2 overlay swallowing pointer events. Two boring bugs, two days of 'the OS is broken'.
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TL;DR

Aurora is a browser-based OS — window manager, virtual file system, terminal, 8 apps — straight TypeScript with zero runtime deps. For two days it booted to a spinner and hung on "Initializing kernel…". The kernel never had a bug. The app was loading dist/main.js which did not exist on GitHub Pages, because dist/ is gitignored and Pages serves from the repo. Then, after fixing that, the desktop icons silently ignored clicks. Second bug: a full-bleed layer at z-index: 2 swallowed every pointer event meant for them.

Bug one: GitHub Pages does not run your build

The page referenced dist/style.css and dist/main.js. The repo had .gitignore ignoring dist/. GitHub Pages does not execute npm run build for a static site source — it serves the committed tree. Result:

- HTML: 200 (committed)
- assets: 404 (never committed)
- boot: stuck at "Initializing kernel…" forever

The UI text made it look like a kernel hang, because the boot sequence awaited a bundle that would never arrive. The fix was a one-liner that should have been a CI job: commit the built output, or publish Pages from the dist/ folder. I built the bundle and force-added it to the repo.

The deeper lesson is about failure mode. "OS stuck on kernel init" reads as a deep systems bug. It was a static-file deployment miss. The boot screen gives you no diagnostic; the console gives you a 404. Always check the network tab before the CPU.

Bug two: the invisible layer that eats clicks

After the bundles went live, the OS booted — but desktop icons (double-click to launch) did nothing. Single click did select, so it felt random. The real cause:

``
windows-layer { position: absolute; inset: 0; z-index: 2; }
`

A transparent full-viewport layer sits above the icon grid (z-index: 1). Even empty, an element with positive z-index and default pointer-events: auto captures pointer events that cross it. Icons never received the events; selection worked because… actually it didn't belong to that layer, but the launch (double-click) path went through the window layer's parent.

The fix:

`
windows-layer { pointer-events: none; }
windows-layer .win { pointer-events: auto; }
`

Click-through by default; opt-in only for actual windows. This pattern belongs in every layered UI: an empty layout container should never block input.

What I'd do differently

1. Walk the asset tree after every Pages deploy. curl every referenced dist/* file. A missing bundle is a 30-second check, not a two-day mystery.
2. Commit the build or CI-render it. Pick one: either Pages builds from dist/` (plugin) or the repo carries the bundle. Decide in the repo README so it doesn't drift again.
3. Default pointer-events to none on layout scaffolding. Only interactive surfaces (windows, buttons) should claim pointer events; containers should be transparent to input by policy, not by luck.

Repo

Aurora — a complete browser OS: window manager, VFS, terminal (35+ commands), 8 apps, procedural audio (TypeScript, zero runtime deps).

// EOF · bartoszosiej · 497 words · #web #typescript #debugging #deploy #github-pages · read the blog like software: curl | less