Minimal P5.js Instance Mode template

sketch.js

const s = (p55) => { // using p55 to refer to the sketch - throwback to Processing megabucket era :) 
  // Declare some globals
  let canvasW = 521;
  let canvasH = 521;

  p55.preload = () => {
    // load any fonts, data, etc...
  };

  p55.setup = () => {
    p55.createCanvas(canvasW, canvasH);
  };

  p55.draw = () => {
    // including some example drawing code
    p55.background(76, 123, 199);
    p55.fill(255,199);
    p55.noStroke();
    p55.rect(p55.mouseX, p55.mouseY, 47, 47);
  };
};

let myp5 = new p5(s);