import { ServiceAccountCredential } from "../credential";
import { ErrorInfo } from "../error";
export interface CryptoSigner {
    readonly algorithm: "RS256" | "none";
    sign(token: string): Promise<string>;
    getAccountId(): Promise<string>;
}
export declare class ServiceAccountSigner implements CryptoSigner {
    private readonly credential;
    algorithm: "RS256";
    constructor(credential: ServiceAccountCredential);
    sign(token: string): Promise<string>;
    /**
     * @inheritDoc
     */
    getAccountId(): Promise<string>;
}
export interface ExtendedErrorInfo extends ErrorInfo {
    cause?: Error;
}
export declare class CryptoSignerError extends Error {
    private errorInfo;
    constructor(errorInfo: ExtendedErrorInfo);
    get code(): string;
    get message(): string;
    get cause(): Error | undefined;
}
export declare class CryptoSignerErrorCode {
    static INVALID_ARGUMENT: string;
    static INTERNAL_ERROR: string;
    static INVALID_CREDENTIAL: string;
    static SERVER_ERROR: string;
}