JSON serialize the window object by removing cycles

dump-window.js

// Taken from https://stackoverflow.com/a/9382383
let decycle;
decycle = (obj, stack = []) => {
  if (!obj || typeof obj !== 'object') {
    return obj;
  }
  if (stack.includes(obj)) {
    return null;
  }
  let s = stack.concat([obj]);
  return Array.isArray(obj) ? obj.map(x => decycle(x, s)) :
                              Object.fromEntries(Object.entries(obj).map(
                                  ([k, v]) => [k, decycle(v, s)]));
};
console.log(JSON.stringify(decycle(window)));