import { JSONClient } from 'google-auth-library/build/src/auth/googleauth';
import { JWTInput, RefreshOptions } from 'google-auth-library';
import { SACredential } from './interfaces';
export declare class GoogleSACredential implements SACredential {
    private json;
    private options;
    protected auth: JSONClient;
    /**
     *
     * @param json The input object.
     * @param options The JWT or UserRefresh options for the client
     */
    constructor(json: string | JWTInput, options?: RefreshOptions);
    private build;
    getToken(): Promise<string | null | undefined>;
}
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