/**
 * Determines whether or not the given value is a falsy value, also acts as a typeguard.
 * @param value - value to check
 * @returns true if given a falsy value, false otherwise
 * ```typescript
 * pipe(
 *   ['a', false, '', null, 0, 4],
 *   Arrays.filter(isFalsy) // -> [false, '', null, 0]
 * );
 * ```
 */
export declare const isFalsy: <T>(value: T) => value is T & (T extends number ? 0 : T extends string ? "" : T extends boolean ? false : T extends undefined ? undefined : T extends null ? null : never);