export interface RequestDbPool {
    end(): Promise<unknown>;
}
interface PoolRequestScope {
    readonly pools: Map<string, RequestDbPool>;
    readonly finalizers: Array<() => void>;
    leases: number;
    closing: boolean;
    closePromise?: Promise<void>;
}
interface WaitUntilRequest {
    waitUntil?: (promise: Promise<unknown>) => void;
}
export declare function getCurrentRequestDbPoolScope(): PoolRequestScope | undefined;
/**
 * Keeps the request pool that owns a shared initialization promise alive until
 * its work settles, even if the request stops awaiting it first.
 */
export declare function retainRequestDbPoolScope<T>(promise: Promise<T>): Promise<T>;
export declare function getOrCreateRequestDbPool<T extends RequestDbPool>(key: string, create: () => T): T;
export declare function replaceRequestDbPool(key: string, previous: RequestDbPool, next: RequestDbPool): boolean;
export declare function getRequestDbPool(key: string): RequestDbPool | undefined;
/**
 * Gives a Cloudflare request its own database pools and keeps them alive while
 * the handler, a returned response stream, or registered waitUntil work runs.
 */
export declare function runWithRequestDbPoolScope<T>(enabled: boolean, request: WaitUntilRequest | undefined, fn: () => T | Promise<T>): T | Promise<T>;
export {};