import { TimeDiff } from './time-diff';
import { InjectionToken } from '@angular/core';
/**
 * Function Type for the `UpdateIntervalGenerator`
 *
 * @public
 * @api
 */
export declare type UpdateIntervalGenerator = (diff: TimeDiff) => number;
/**
 * Custom `UpdateIntervalGenerator` Injection Token
 *
 * @public
 * @api
 */
export declare const CUSTOM_UPDATE_INTERVAL_GENERATOR: InjectionToken<UpdateIntervalGenerator>;
/**
 * Determinate the point of time on when the output should be checked for a update
 *
 * @param diff The time diff object
 * @return A point of time in future in seconds
 * @public
 * @api
 */
export declare const defaultUpdateIntervalGenerator: UpdateIntervalGenerator;
/**
 * Provides the `UpdateIntervalGenerator` preferring a custom provider for internal usage
 *
 * @internal
 */
export declare const UPDATE_INTERVAL_GENERATOR: InjectionToken<UpdateIntervalGenerator>;