isNullish

[nmsn]

[nmsn]

/**
 * Tests for Nullish by simply comparing `val` for equality with `null`.
 * @example
 *   const consumer = (param: Nullish | string): string => {
 *     if (isNullish(param)) {
 *       // typeof param === Nullish
 *       return String(param) + ' was Nullish';
 *     }
 *     // typeof param === string
 *     return param.toString();
 *   };
 */
export const isNullish = (val: unknown): val is Nullish => val == null;