import type { OptionOptions } from '../interfaces';
/**
 * Represents a string option.
 */
export declare class StringOption<T extends string | null = null> {
    /**
     * The type of the option. It's always string.
     */
    readonly type = "string";
    /**
     * The default value of the option.
     */
    readonly defaultValue: T | null;
    /**
     * Creates a new instance of the string option.
     * @param options The options of the string option.
     */
    constructor(options?: OptionOptions<T>);
}