import { InputOperationsArray, IterableEngineContext } from "../../engine/context";
import { FilterFn, ForEachFn, MapFn, ReduceFn } from "../../operations/sync";
export interface TC39IterableHelpersObject<T> extends Iterable<T> {
    map?<O>(mapperFn: MapFn<T, O>): TC39IterableHelpersObject<O>;
    filter?(filterFn: FilterFn<T>): TC39IterableHelpersObject<T>;
    take?(limit: number): TC39IterableHelpersObject<T>;
    drop?(limit: number): TC39IterableHelpersObject<T>;
    flatMap?<O>(mapperFn: MapFn<T, Iterable<O>>): TC39IterableHelpersObject<O>;
    reduce?<A>(reduceFn: ReduceFn<T, A>, initial: A): A;
    toArray?(): T[];
    forEach?(callbackFn: ForEachFn<T>): void;
    some?(filterFn: FilterFn<T>): boolean;
    every?(filterFn: FilterFn<T>): boolean;
    find?(filterFn: FilterFn<T>): T | undefined;
}
export declare function assertTC39IteratorHelpersObject<O extends InputOperationsArray, T>(input: unknown): asserts input is (...operations: O) => Omit<IterableEngineContext<O, never | number>, "instance"> & {
    instance(): TC39IterableHelpersObject<T>;
};