🤷‍♀️ SeraJS is a lightweight, signal-based reactive JavaScript library

#webdev #javascript #beginners #programming

📖 Introduction

SeraJS is a lightweight, signal-based reactive JavaScript library for
building dynamic user interfaces.

At just 1.25KB gzipped and only 135 lines of code, it's a remarkably lightweight reactive UI library — offering powerful reactivity with minimal overhead.

⚡️ SeraJS focuses on minimalism and performance without sacrificing
developer experience.

Bundle Size Comparison (Minified + Gzipped)

Library	Size (gzipped)	Build Step Required	Main Purpose	Key Features
SeraJS	1.25kb	Optional 😎	Reactive UI	135 lines of code, extremely lightweight
React	~40kb	Yes	UI components	Virtual DOM, component-based architecture, JSX
Vue	~33kb	Optional	Progressive framework	Reactive data binding, component system, single-file components
Solid.js	~7kb	Yes	Reactive UI	No virtual DOM, compiled templates, fine-grained reactivity
Alpine.js	~7.1kb	No	Lightweight framework	Minimal DOM manipulation, declarative syntax, works with existing HTML
Preact	~4kb	Yes	React alternative	API compatible with React, smaller size, faster performance
htmx	~14kb	No	AJAX enhancements	HTML attributes for AJAX, minimal JavaScript, server-side rendering friendly

⚙️ Core Concepts

🔄 Signal-Based Reactivity

SeraJS uses a signal-based reactive system, a modern approach to state
management that enables efficient updates:

🧠 Signals

Self-contained reactive values that notify subscribers when they change.
🌀 Effects

Functions that automatically re-execute when their dependencies (signals)

change.
🧭 Memo

A memoization helper similar to React's useMemo, used to cache the result

of a computation based on reactive dependencies to avoid unnecessary
recalculations.
🔬 Fine-Grained Updates

Only the specific DOM elements affected by state changes are updated,

resulting in minimal re-rendering and high performance.

💡 SeraJS is designed to be intuitive, fast, and easy to integrate into any
project — making it a perfect choice for modern frontend development.

Why SeraJS?

SeraJS brings together the best parts of libraries like React, Solid, and Lit — blending familiar patterns with a fresh, minimal approach.

At just 1.25KB gzipped and only 135 lines of code, this reactive UI library stays ultra-light while still delivering powerful reactivity.

Whether you want a build system or prefer a no-build workflow, SeraJS has you covered. It’s flexible enough to fit your dev style — use it how you want.

🌱 Sera.js Basic Example

A minimal example showing a Hello World message using Sera.js.

📄 App.jsx

import { h } from "serajs";

export default function App() {
  return (
    <h1>Hello world</h1>
  );
}

No Build, No Dependencies

<!DOCTYPE html>
<html>
  <head>
    <title>Sera js 😎</title>
  </head>
  <body>
    <script type="module">
      import { h, setSignal, setEffect } from "//unpkg.com/serajs";

      function Hello() {
        const [count, setCount] = setSignal(0);

        setEffect(() => {
          console.log(count());
        });

        return h(
          "div",
          null,
          h("h1", null, "Hello World!"),
          h("p", { style: { color: "red" } }, "Do you Like Serajs?"),
          h("h1", null, () => `Count: ${count()}`),
          h(
            "button",
            { onclick: () => setCount(count() + 1) },
            "Increase Count"
          )
        );
      }

      const root = document.body;
      root.appendChild(Hello());
    </script>
  </body>
</html>

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