import { Voidable } from "./maybe";
/** Iterator Walker */
export declare class Walker<T> implements IterableIterator<T>, Iterator<T> {
    #private;
    constructor(iter: Iterable<T>);
    /** Peek next value */
    peek(): Voidable<T>;
    [Symbol.iterator](): IterableIterator<T>;
    /** Move to next */
    next(): IteratorResult<T, void>;
    /** Eat current peek value */
    eat(): Voidable<T>;
    /** Eat peek or move to next */
    take(): Voidable<T>;
}
/** AsyncIterator Walker */
export declare class AWalker<T> implements AsyncIterableIterator<T>, AsyncIterator<T> {
    #private;
    constructor(iter: AsyncIterable<T>);
    /** Peek next value */
    peek(): Promise<Voidable<T>>;
    [Symbol.asyncIterator](): AsyncIterableIterator<T>;
    /** Move to next */
    next(): Promise<IteratorResult<T, void>>;
    /** Eat current peek value */
    eat(): Voidable<T>;
    /** Eat peek or move to next */
    take(): Promise<Voidable<T>>;
}