fabric-js

fabric-js Best Practices

This document provides definitive guidelines for developing with fabric-js (v6.9.0+), emphasizing performance, maintainability, and modern API adoption. Adhere to these rules to ensure robust and efficient canvas applications.

1. Code Organization and Structure

1.1. Embrace TypeScript and ES Modules

Always use TypeScript for type safety and leverage ES6 modules for efficient bundling. Import only the specific fabric components you need.

❌ BAD: Global fabric access, full library import

// main.js
import 'fabric'; // Imports everything
const canvas = new fabric.Canvas('myCanvas');
canvas.add(new fabric.Rect({ left: 10, top: 10, width: 50, height: 50 }));

✅ GOOD: Modular, typed imports

// main.ts
import { Canvas, Rect, IText } from 'fabric';

const canvas = new Canvas('myCanvas');
const rect = new Rect({ left: 10, top: 10, width: 50, height: 50, fill: 'red' });
canvas.add(rect);

1.2. Choose the Right Canvas Type

Use StaticCanvas for read-only displays or high-frame-rate scenes where interactivity is not required. It offers a significant performance boost by skipping event handling.

❌ BAD: Using Canvas when no interaction is needed

// For displaying a static image or animation without user interaction
const canvas = new Canvas('myStaticCanvas');
canvas.add(someFabricObject);
canvas.renderAll();

✅ GOOD: Using StaticCanvas for static or high-performance rendering

// For displaying a static image or animation without user interaction
import { StaticCanvas, Rect } from 'fabric';

const staticCanvas = new StaticCanvas('myStaticCanvas');
const rect = new Rect({ left: 10, top: 10, width: 50, height: 50, fill: 'blue' });
staticCanvas.add(rect);
staticCanvas.renderAll();

2. Performance Considerations

2.1. Disable Unnecessary Interactivity

Minimize overhead by disabling selection, controls, and borders on objects or the canvas itself when not needed.