PFMCODES

Posted on Jul 14, 2025 • Edited on Mar 22

Neutronium is back – here's everything that changed since v3

#webdev #javascript #react #typescript

Neutronium is back – here's everything that changed since 1000 downloads

Eight months ago I posted about Neutronium hitting 1,000 downloads in its first 24 hours. A lot has changed since then.

Neutronium is now at v3.4.5, and it's a completely different project from what I launched in July.

What is Neutronium?

A lightweight JavaScript framework built for developers who want explicit control, predictable behavior, and zero unnecessary abstractions.

React-like ergonomics. No virtual DOM. No build step. No heavy runtime.

npm install neutronium

What's new since launch

It got smaller

The original release was ~139kb unpacked. It's now 57.7kb — more than half the size, with more features.

Hooks

useState and useEffect are now supported. If you're coming from React, you already know how to use them.

React-like JSX syntax

Neutronium now uses JSX-style syntax, making it much easier to switch from React without relearning everything.

import { createApp } from 'neutronium'

function Greeting({ name }) {
  return <h2>Hello, {name}!</h2>;
}

export default function App() {
  return (
    <>
      <h1>Welcome to Neutronium</h1>
      <Greeting name="yourName" />
    </>
  );
}

createApp(App).mount('body');

Browser-safe compiler

One of the biggest additions: /sandbox.mjs — a browser-safe compiler that lets you run Neutronium without Node.js. Perfect for online editors and playgrounds.

import { compile } from "neutronium/sandbox.mjs";
const result = compile(code);

TypeScript support

TypeScript types are now included (~4.35kb). No separate package needed.

Ecosystem

Two companion packages are now available:

@neuhq/alert
neutronium-alert

The full picture

	July 2025	Now
Version	v3.0.0	v3.4.5
Size	~139kb	~57.7kb
Hooks	No	Yes
JSX	Yes	Yes
Browser compiler	No	Yes
TypeScript	Broken	Yes
Playground	No	Yes

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