export declare abstract class BaseError extends Error {
    cause?: Error | undefined;
    constructor(message: string, cause?: Error | undefined);
    toString(): string;
    private getType;
    private getCauseString;
    private getTypedCauseMessage;
}
export declare class IllegalStateError extends BaseError {
    cause?: Error | undefined;
    constructor(message: string, cause?: Error | undefined);
}