import { UserOperationStruct } from '@account-abstraction/contracts';
/**
 * an API to external a UserOperation with paymaster info
 */
export declare class PaymasterAPI {
    /**
     * @param userOp a partially-filled UserOperation (without signature and paymasterAndData
     *  note that the "preVerificationGas" is incomplete: it can't account for the
     *  paymasterAndData value, which will only be returned by this method..
     * @returns the value to put into the PaymasterAndData, undefined to leave it empty
     */
    getPaymasterAndData(userOp: Partial<UserOperationStruct>): Promise<string | undefined>;
}