export type PredicateFn<T> = (existing: T, upcoming: T) => boolean;
export declare function populateArray<T extends any[]>(a: T, b: T, predicate: PredicateFn<T[number]>, method?: "push" | "unshift"): T;
export declare function cleanArray<T extends any[]>(a: T, b: T, predicate: PredicateFn<T[number]>): T;