import { Result } from '../classes/Result';
export declare const ITERATOR_EXHAUSTED: unique symbol;
export type SyncGenerator<I> = () => I | Result<I>;
export type SyncStepper<I> = (previous: I) => I | Result<I>;
export type SyncIterator<I, O> = (input: I) => O | Result<O>;
export type SyncValidator<O> = (output: O) => boolean | Result<boolean>;
export declare function iterateSync<I, O>(
	genfn: SyncGenerator<I>,
	iterator: SyncIterator<I, O>,
	validator: SyncValidator<O>
): Result<O>;
export declare function iterateSync<I, O>(
	iterable: Iterable<I>,
	iterator: SyncIterator<I, O>,
	validator: SyncValidator<O>
): Result<O>;
export declare function iterateSync<I, O>(
	init: SyncGenerator<I>,
	step: SyncStepper<I>,
	iterator: SyncIterator<I, O>,
	validator: SyncValidator<O>
): Result<O>;
export declare function iterateSyncIterableWrapper<I, O>(
	iterable: Iterable<I>,
	iterator: SyncIterator<I, O>,
	validator: SyncValidator<O>
): Result<O>;
export declare function iterateSyncResultWrapper<I, O>(
	init: SyncGenerator<I>,
	step: SyncStepper<I>,
	iterator: SyncIterator<I, O>,
	validator?: SyncValidator<O>
): Result<O>;
export declare function iterateSyncImpl<I, O>(
	init: SyncGenerator<I>,
	step: SyncStepper<I>,
	iterator: SyncIterator<I, O>,
	validator?: SyncValidator<O>
): O;