/**
 * Narrow type of `x` to `X`
 *
 * @example
 *
 * ```ts
 * const x = 123 // `x` is `number`
 * const y = narrow(x).toType<123 | 234>() // `y` is `123 | 234`
 * ```
 *
 * @param x - Variable to narrow type of
 * @returns `{toType<T>()}`
 */
export declare function narrow<X>(x: X): {
    toType<T extends X>(): T;
};
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