import type { ILazy, ILazyPromise } from '../lazy/types.js';
import type { IResettableModel } from '../models/types.js';
import { ExpireTracker } from './expire.js';
/**
 * Calls factory fn to fetch and store some value for a limited time.
 *
 * To factory method be called, `current` getter must be accessed.
*/
export declare class TempoCache<T> {
    readonly factory: () => T;
    private _current;
    readonly tracker: ExpireTracker;
    constructor(factory: () => T, lifetimeMs: number);
    get isExpired(): boolean;
    get current(): T | undefined;
}
export declare namespace TempoCache {
    /**
     * Creates a TempoCache instance which caches `ILazy.value` for a specified time.
     *
     * Note a limitation: calling `reset` (or changing the stored value directly in other way) on `lazy` will not affect the value cached by `TempoCache` instance.
    */
    function createFromLazy<T>(lazy: ILazy<T> & IResettableModel, lifetimeMs: number): TempoCache<T>;
    /**
     * Creates a TempoCache instance which caches `ILazyPromise.promise` for a specified time.
     *
     * Note a limitation: calling `reset` (or changing the stored value directly in other way) on `lazy` will not affect the value cached by `TempoCache` instance.
    */
    function createFromLazyPromise<T>(lazy: ILazyPromise<T> & IResettableModel, lifetimeMs: number): TempoCache<Promise<T | undefined>>;
}