import type { Maybe } from "../../Common";
import type { RelationalDBEngine } from "../../Resources";
import type { RDSProxyTargetType, RelationalDBProxyType } from "../../Resources/RelationalDatabase/DBProxy";
import type { ResourceHelper } from "../ResourceHelper";
export declare function getRelationalDBProxyResourceUtils(resource: ResourceHelper<RelationalDBProxyType>): RelationalDBProxyResourceUtils;
export interface RelationalDBProxyResourceUtils {
    /**
     * Validate if rds version is supported by proxy resource
     * @param version db version
     * @param engine engine type
     */
    isDbVersionValidForProxy(version: string, engine: RelationalDBEngine): boolean;
    /**
     * returns number of connected rdb resources
     */
    getProxyTargetsCount(): number;
    /**
     * Returns proxy's connected RDS.
     * If proxy connects to more than one RDS, method throws error
     */
    getValidProxyTarget(): Maybe<ResourceHelper<RDSProxyTargetType>>;
}