export declare class FieldWithSameKeyAlreadyExistsException {
    private message;
    constructor(message: string);
    toString(): string;
}
export declare class FieldWithKeyDoesNotExistException {
    private message;
    constructor(message: string);
    toString(): string;
}
export declare class MultipleFieldsWithSameKeyExistException {
    private message;
    constructor(message: string);
    toString(): string;
}