import Collection from "../Collection/collection.operation";
/**
 * Holds long-lived references to the `config` database's `users`/`roles`/`permissions`
 * collections. Collection instances are reused across requests instead of being
 * recreated per call, since each `Collection` eagerly loads its index cache on
 * construction - recreating it per request would repeatedly reload indexes for
 * no benefit.
 */
declare class ConfigDatabase {
    private static instance;
    private usersCollection;
    private rolesCollection;
    private permissionsCollection;
    static getInstance(): ConfigDatabase;
    setCollections(usersCollection: Collection, rolesCollection: Collection, permissionsCollection: Collection): void;
    isInitialized(): boolean;
    getUsersCollection(): Collection;
    getRolesCollection(): Collection;
    getPermissionsCollection(): Collection;
}
declare const _default: ConfigDatabase;
export default _default;