import { IGenerator } from "./_types/IGenerator";
import { Field, IDataHook } from "model-react";
/**
 * A class used to extract items from a (custom) generator
 */
export declare class GeneratorStreamExtractor<T> {
    protected generator: IGenerator<T>;
    protected itemCallback: (item: T) => void;
    protected started: Field<boolean>;
    protected paused: Field<boolean>;
    protected stopped: Field<boolean>;
    protected sentStopSignal: boolean;
    protected pausedItem: T | null;
    protected continueExtraction: ((stopped: boolean) => void) | null;
    protected resolveStart: null | (() => void);
    protected generatorResult: Promise<void>;
    /**
     * Creates a new generator extractor which extract a continuous stream of items
     * @param generator The generator to extract the items from
     * @param itemCallback The callback to forward the extracted items to
     */
    constructor(generator: IGenerator<T>, itemCallback: (item: T) => void);
    /**
     * Starts extracting items from the generator, or continues when paused
     * @returns A promise that resolves when extraction finished or was stopped
     */
    start(): Promise<void>;
    /**
     * Pauses item extraction, which may be continued later
     */
    pause(): void;
    /**
     * Stops item extraction, which can't be continued later
     */
    stop(): void;
    /**
     * Retrieves whether the item extraction has started
     * @param hook The hook to subscribe to changes
     * @returns Whether started
     */
    hasStarted(hook?: IDataHook): boolean;
    /**
     * Retrieves whether item extraction has been paused
     * @param hook The hook to subscribe to changes
     * @returns Whether paused
     */
    isPaused(hook?: IDataHook): boolean;
    /**
     * Retrieves whether all items were extracted from the generator
     * @param hook The hook to subscribe to changes
     * @returns Whether the generator extracted all items, or the extractor was stopped
     */
    hasFinished(hook?: IDataHook): boolean;
}
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