subwaylights.js

let tokens = await Tagger.getByTag("light");
if (tokens.length === 0) return;

let sceneId = canvas.scene._id;
let duration = 2000;
let intervall = 1000;

let moveToken = async function (token) {
  if (!token) return;
  await token.update({
    light: {
      color:
        "#" + ((Math.random() * 0xffffff) << 0).toString(16).padStart(6, "0"),
    },
  });
  new Sequence()
    .animation()
    .on(token)
    .teleportTo({ x: 0, y: token.y })
    .wait(500)

    .animation()
    .on(token)
    .moveTowards({ x: 4700, y: token.y })
    .duration(duration)
    .waitUntilFinished()

    .animation()
    .on(token)
    .teleportTo({ x: 0, y: token.y })
    .play();
};

let theLoop = async function () {
  if (sceneId != canvas.scene._id) {
    console.log("This it the end!");
    return;
  }
  let tokens = await Tagger.getByTag("light");
  tokens = tokens
    .map((value) => ({ value, sort: Math.random() }))
    .sort((a, b) => a.sort - b.sort)
    .map(({ value }) => value);
  for (const token of tokens) {
    // for in threw errors...
    setTimeout(
      moveToken,
      (tokens.indexOf(token) / (tokens.length - 1)) * duration,
      token
    );
  }

  setTimeout(theLoop, duration + 1000 * tokens.length);
};

theLoop();