particle.js

const Scene = require('Scene')
const Animation = require('Animation')

Scene.root.findFirst('emitter0').then(obj => {
    const alphaSampler = Animation.samplers.HSVA([
        Animation.samplers.constant(1),
        Animation.samplers.constant(1),
        Animation.samplers.constant(1),
        Animation.samplers.easeInQuad(1, 0)
      ]);
      
      const sizeSampler = Animation.samplers.easeInQuad(0, 600);
      
      obj.hsvaColorModulationModifier = alphaSampler;
      obj.sizeModifier = sizeSampler;
    });