import { SyncOperation } from "../operation";
export interface FilterFn<T, Is extends T = T> {
    (value: T): boolean;
}
export interface GuardFilterFn<T, Is extends T> {
    (value: T): value is Is;
}
export declare function filterNegatable<T>(callbackFn: FilterFn<T>, negate?: boolean): SyncOperation<T, IterableIterator<T>>;
export declare function filter<T, Is extends T>(callbackFn: FilterFn<T, Is>): SyncOperation<T, Iterable<Is>>;
export declare function filter<T>(callbackFn: FilterFn<T>): SyncOperation<T, Iterable<T>>;