Function setDifference

src/utils.ts:581–587

(setA: Iterable<T>, setB: Iterable<T>)

/** Returns the items that are uniquely in setA */
export function setDifference<T>(setA: Iterable<T>, setB: Iterable<T>): Set<T> {
  const difference = new Set<T>(setA);
  for (const elem of setB) {
    difference.delete(elem);
  }
  return difference;
}

const HAS_OWN = (object: unknown, prop: string) =>
  Object.prototype.hasOwnProperty.call(object, prop);