export default class Context<V> {
    private key;
    private value;
    constructor(key: string, value: V);
    assert(assertFunc: (value: V) => boolean, message?: string | ((value?: V, key?: string) => string)): this;
    transform<R>(getValue: (value: V) => R): Context<R>;
    asEnum(validValues: V[]): this;
    asRegex(regex: RegExp): this;
    asLowerCase(): Context<string>;
    asUpperCase(): Context<string>;
    asBoolean(): Context<boolean>;
    asInt(): Context<number>;
    asFloat(): Context<number>;
    greater(n: number): any;
    greaterOrEqual(n: number): Context<number>;
    less(n: number): Context<number>;
    lessOrEqual(n: number): Context<number>;
    asJson(): Context<any>;
    asJsonArray(): Context<[any]>;
    asPort(): Context<number>;
}