import { AWSError, Credentials } from 'aws-sdk';
export default class GCPCredentials extends Credentials {
    private accountId;
    private targetRoleName;
    private proxyAccountId;
    private proxyRoleName;
    constructor(accountId: string, targetRoleName: string, proxyAccountId: string, proxyRoleName: string);
    refresh(callback: (err?: AWSError) => void): Promise<void>;
    getTokenId(): Promise<string>;
}