u/svssdeva

Replaced Node, npm, esbuild, and Jest with Bun across my personal projects. Six months in.

Practical outcome: CI is faster, local dev is snappier, and I have one fewer layer of "why is this package version conflicting with that one."

The site itself — beyondcodekarma.in — is built on Astro. The dev toolchain runs on Bun. The framing I use for the whole project is Vedic mythology as mental models for software concepts. The Bun post calls it the Vishwakarma of JavaScript — the divine craftsman who builds the instruments others use to do their work.

It's an opinionated read, not a neutral review. If you're evaluating Bun for a project, the post covers where it holds up and where it doesn't.

Most explanations of the event loop teach you the mechanics but leave you with the wrong intuition. They show you a call stack and a task queue and say "JavaScript runs one thing at a time" , which is true but incomplete.

What they miss:

The microtask queue is not part of the event loop cycle in the way the task queue is. It drains completely after every task , including tasks queued by microtasks, before the loop moves on. This is why Promise chains never interleave with setTimeout callbacks.

The render step sits between tasks, not between microtasks. Queue enough microtasks and you'll block painting without blocking the call stack in any obvious way.

setTimeout(fn, 0) is a task queue entry. Promise.resolve().then(fn) is a microtask. These are fundamentally different lanes , not just different timings.

I wrote a deep dive on this with an interactive visualizer that animates every queue in real time as you run snippets. The framing is unconventional , I mapped it to Vedic karma and dharma as a mental model layer, but the mechanics are spec-accurate.

If you've ever been surprised by async execution order, this should close the gap permanently.

Interactive version: https://beyondcodekarma.in/javascript/js-event-loop/

Rebuilt my dev toolchain around Bun — here's what it actually looks like

The JS Event Loop isn't just a queue , here's the mental model most tutorials get wrong