declare class Castium<T> {
    private value;
    constructor(value: T);
    number<D extends number | null>(defaultValue?: D): Castium<number | D>;
    string(): Castium<string>;
    boolean(): Castium<boolean>;
    isEqual(expected: T): Castium<boolean>;
    booleanString(): Castium<boolean | null>;
    date(): Castium<Date | null>;
    isoDate(): Castium<string | null>;
    fromDate(): Castium<Date | null>;
    toDate(): Castium<Date | null>;
    dateTime(): Castium<number | null>;
    array(): Castium<any[] | null>;
    object(): Castium<object | null>;
    nullable(): Castium<T | null>;
    undefined(): Castium<T | undefined>;
    default<U>(defaultValue: U): Castium<U | Exclude<T, null>>;
    transform<U>(fn: (value: T) => U, defaultValue?: U): Castium<U | null>;
    json(): Castium<object | null>;
    match(regex: RegExp): Castium<boolean>;
    oneOf(...values: (T | T[])[]): Castium<boolean>;
    clamp(min: number, max: number): Castium<number>;
    enum<E>(enumObj: Record<string, E>): Castium<Exclude<E, string> | null>;
    get(): T;
}
declare const c: <T>(value: T) => Castium<T>;

export { c };