isFalsy

[nmsn]

[nmsn]

/**
 * Tests for Falsy by simply applying negation `!` to the tested `val`.
 *
 * The value is mostly in added type-information and explicity,
 * but in case of this simple type much the same can often be archived by just using negation `!`:
 * @example
 *   const consumer = (value: boolean | Falsy) => {
 *     if (!value) {
 *         return ;
 *     }
 *     type newType = typeof value; // === true
 *     // do stuff
 *   };
 */
export const isFalsy = (val: unknown): val is Falsy => !val;