fabic-leak.js

const { fabric } = require('fabric');
const fs = require('fs');

// OK
let loop1 = 100;
let loop2 = 0;

// Leak
loop1 = 1;
loop2 = 100;
// leak and goes up to 700Mo RSS and 600Mo for external.
// loop2 = 600;

const m = () => ([process.memoryUsage().rss / 1000000 | 0, process.memoryUsage().heapTotal / 1000000 | 0, process.memoryUsage().heapUsed / 1000000 | 0, process.memoryUsage().external / 1000000 | 0]);
const image = (i = 0) => {
  const canvas = new fabric.StaticCanvas();
  canvas.setWidth(600);
  canvas.setHeight(400);

  const obj = {
    version: '2.0.0-rc.3',
    objects: [{
      type: 'image',
      version: '2.0.0-rc.3',
      src: `https://imgflip.com/s/meme/Leonardo-Dicaprio-Cheers.jpg`,
    }],
  };

  canvas.loadFromJSON(obj, () => {
    // convert tags
    canvas.getObjects().forEach(o => {
      if (o.type === 'image') {
        let newSrc = 'https://lh5.googleusercontent.com/-uU9156CO9Y8/AAAAAAAAAAI/AAAAAAAARzE/gXfT-SXMzxs/photo.jpg';

        // newSrc = `${o.src}?r=${Random.id()}`;
        const oldWidth = o.width;
        
        for (let i = 0; i < loop2; i++) {
          o.setSrc(newSrc);
        }
      }
    });

    // canvas.renderAll();

    canvas.toDataURL({ format: 'png' });
    canvas.clear();
    canvas.dispose();
    canvas.contextContainer = null;
    // global.gc();
    console.log(`IMG${i}`, m());
  });
};

console.log('START ', m());

for (let i = 0; i < loop1; i++) {
  image(i);
}

console.log('END ', m());

setInterval(() => {
  global.gc();
  console.log('RSS ', m());  
}, 1000);