import Keychain from 'react-native-keychain';
/**
 * This is a wrapper to simplify our use of the keychain / other storage (Android) -
 * See: https://github.com/oblador/react-native-keychain for more documentation
 *
 *
 * Notes: Using "generic" credentials to keep things flexible -- the "service" is what differentiates each client (or other item)
 */
/**
 * A container for data that should be encrypted at rest on the user's device.
 *
 * Should not contain large amounts of data as serialization/deserialization can be slow.
 *
 * @param instanceIdentifier a unique identifier for the context, could be a client or user id, etc.
 */
export declare class SecureStore<Stored> {
    instanceIdentifier: string;
    keychainOptions: Keychain.Options;
    constructor(instanceIdentifier: string, accessGroup?: string);
    /**
     * Stores an object as { username, password } at key com.lifeomic.securestore/<instanceIdentifier>
     * @param object
     */
    setObject(object: Stored): Promise<false | Keychain.Result>;
    getObject(): Promise<Stored | null>;
    clear(): Promise<boolean>;
}
export declare const unusedUsername = "unused-username";