import type { RedisKey } from "ioredis";
import type { AcquiredResult, AcquireDesire, AcquireOptions, AcquireOptionsInput } from "./Acquire";
declare type Key = RedisKey | number;
declare type Awaitable<T> = T | Promise<T>;
/**
 * Structural contract for custom acquire implementations injected into Cache.
 */
export interface AcquireHelper {
    acquire<T>(key: Key, amount: number, fn: (currentAmount: number, acquiredAmount: number, lackingAmount: number) => Awaitable<T>, options?: AcquireOptionsInput): Promise<T>;
    hashAcquire<T>(key: Key, id: Key, amount: number, fn: (currentAmount: number, acquiredAmount: number, lackingAmount: number) => Awaitable<T>, options?: AcquireOptionsInput): Promise<T>;
    acquireMany<K extends string | number, T>(items: AcquireDesire<K>[], fn: (acquireResult: AcquiredResult<K>[]) => Awaitable<T>, options?: AcquireOptions): Promise<T>;
    hashAcquireMany<K extends string | number, T>(hashKey: string, items: AcquireDesire<K>[], fn: (acquireResult: AcquiredResult<K>[]) => Awaitable<T>, options?: AcquireOptions): Promise<T>;
}
export {};