interface SetAssertions<TContent> {
    containing: (item: TContent) => void;
    containingAllOf: (iterable: Iterable<TContent>) => void;
    containingAnyOf: (iterable: Iterable<TContent>) => void;
    atLeast: (expected: Set<TContent>) => void;
    atMost: (expected: Set<TContent>) => void;
    empty: () => void;
}
export type { SetAssertions };