import { CommonsJoinTable, TCommonsJoin } from './commons-join-table';
export declare class CommonsTimestampJoinTable<A, B, DataT extends {
    timestamp: Date;
    [key: string]: unknown;
} = {
    timestamp: Date;
}> extends CommonsJoinTable<A, B, DataT> {
    purgeOlderThan(threshold: Date): TCommonsJoin<A, B, DataT>[];
    getTimestamp(a: A, b: B): Date | undefined;
    touch(a: A, b: B): boolean;
}