export declare class TooFewSubscribersError extends Error {
    constructor(message?: string);
}
export declare class TooManySubscribersError extends Error {
    constructor(message?: string);
}
export declare class TooFewEventsError extends Error {
    constructor(message?: string);
}
export declare class TooManyEventsError extends Error {
    constructor(message?: string);
}
export declare class TooFewEmailsError extends Error {
    constructor(message?: string);
}
export declare class TooManyEmailsError extends Error {
    constructor(message?: string);
}