froebel/nullish.mjs

TypeScript utility library

/** Checks if `value` is nullish. Literal types are narrowed accordingly. */
export const nullish = value => value === undefined || value === null;

/**
 * Checks if `value` is not nullish. Literal types are narrowed accordingly.
 *
 * @example
 * ```
 * const nums = (...values: (number | undefined)[]): number[] => values.filter(notNullish)
 * ```
 */
export const notNullish = value => value !== null && value !== undefined;