Function intersection

src/material/core/theming/tests/m3-theme.spec.ts:38–40

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

}

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

/** Expects the given warning not to be reported in Sass. */
function expectNoWarning(message: RegExp) {