export default class Exceptional<T> {
    private value;
    private exception;
    private constructor();
    private static getDefaultException();
    static empty<T>(exception?: Error): Exceptional<T>;
    filter(predicate: (T) => boolean, value?: Error | ((T) => Error)): Exceptional<T>;
    flatMap<U>(mapper: (T) => Exceptional<U>): Exceptional<U>;
    get(): T;
    ifPresent(consumer: (T) => void): void;
    isPresent(): boolean;
    map<U>(mapper: (T) => U, value?: Error | ((T) => Error)): Exceptional<U>;
    static of<T>(value: T, exception?: Error): Exceptional<T>;
    static ofNullable<T>(value: T, exception?: Error): Exceptional<T>;
    orElse(other: T): T;
    orElseGet(other: () => T): T;
    orElseThrow<X extends Error>(exceptionSupplier: () => X): T;
    getException(): Error;
    withException(exception: Error): Exceptional<T>;
}