import { AsyncOptionalCreatable, Duration } from '@salesforce/kit';
import { AnyJson } from '@salesforce/ts-types';
import { Logger } from '../logger';
import { StatusResult } from './client';
/**
 * This is a polling client that can be used to poll the status of long running tasks. It can be used as a replacement
 * for Streaming when streaming topics are not available or when streaming handshakes are failing. Why wouldn't you
 * want to use this? It can impact Salesforce API usage.
 *
 * ```
 * const options: PollingClient.Options = {
 *      async poll(): Promise<StatusResult>  {
 *       return Promise.resolve({ completed: true, payload: 'Hello World' });
 *     },
 *     frequency: Duration.milliseconds(10),
 *      timeout: Duration.minutes(1)
 *   };
 * const client = await PollingClient.create(options);
 * const pollResult = await client.subscribe();
 * console.log(`pollResult: ${pollResult}`);
 * ```
 */
export declare class PollingClient extends AsyncOptionalCreatable<PollingClient.Options> {
    protected logger: Logger;
    private options;
    /**
     * Constructor
     *
     * @param options Polling client options
     * @ignore
     */
    constructor(options?: PollingClient.Options);
    /**
     * Asynchronous initializer.
     */
    init(): Promise<void>;
    /**
     * Returns a promise to call the specified polling function using the interval and timeout specified
     * in the polling options.
     */
    subscribe<T = AnyJson>(): Promise<T | undefined>;
}
export declare namespace PollingClient {
    /**
     * Options for the polling client.
     */
    interface Options {
        /**
         * Polling function.
         */
        poll: () => Promise<StatusResult>;
        /**
         * How frequent should the polling function be called.
         */
        frequency: Duration;
        /**
         * Hard timeout for polling.
         */
        timeout: Duration;
        /**
         * Change the name of the timeout error.
         *
         * ```
         * if (err.name === 'MyChangedName) ...
         * ```
         */
        timeoutErrorName?: string;
    }
    /**
     * Default options set for polling. The default options specify a timeout of 3 minutes and polling frequency of 15
     * seconds;
     */
    class DefaultPollingOptions implements PollingClient.Options {
        frequency: Duration;
        poll: () => Promise<StatusResult>;
        timeout: Duration;
        /**
         * constructor
         *
         * @param poll The function used for polling status.
         * {@link StatusResult}
         */
        constructor(poll: () => Promise<StatusResult>);
    }
}