Function hasOwnInPrototypeChain

lib/utils.js:30–46

(thing, prop)

 * @returns {boolean} True when `prop` is owned below Object.prototype
 */
const hasOwnInPrototypeChain = (thing, prop) => {
  let obj = thing;
  const seen = [];

  while (obj != null && obj !== Object.prototype) {
    if (seen.indexOf(obj) !== -1) {
      return false;
    }
    seen.push(obj);

    if (hasOwnProperty(obj, prop)) {
      return true;
    }
    obj = getPrototypeOf(obj);
  }
  return false;
};

/**
 * Read `obj[prop]` only when it is safe from Object.prototype pollution. Own