Function union

src/material/core/theming/tests/m3-theme.spec.ts:34–36

(...sets: Set<T>[])

}

function union<T>(...sets: Set<T>[]): Set<T> {
  return new Set(sets.flatMap(s => [...s]));
}

function intersection<T>(set: Set<T>, ...sets: Set<T>[]): Set<T> {
  return new Set([...set].filter(i => sets.every(s => s.has(i))));