/**
 * narrows the type to remove undefined
 *
 * ref
 * - https://stackoverflow.com/a/63045455/3068233
 */
export type IsDefined<T> = T extends undefined ? never : T;
/**
 * narrows the type to remove undefined
 *
 * note
 * - alias of IsDefined
 */
export type NotUndefined<T> = IsDefined<T>;
/**
 * checks whether the value is not undefined
 */
export declare const isDefined: <T>(val: T) => val is IsDefined<T>;
/**
 * checks whether the value is not undefined
 *
 * note
 * - alias of isDefined
 */
export declare const isNotUndefined: <T>(val: T) => val is IsDefined<T>;