import { CredentialProvider, TdaCredential } from './credentialProvider';
export declare abstract class CredentialProviderImpl implements CredentialProvider {
    fetch(): Promise<TdaCredential>;
    update(tdaCredential: TdaCredential): Promise<void>;
    updateCredential(tdaCredential: TdaCredential): Promise<void>;
    getCredential(): Promise<TdaCredential>;
}