import { Equals } from "../type";
/**
 * whether `S` is the empty string `""`.
 * does not consider union types including the empty string to "be" the empty string.
 *
 * @since 0.0.2
 *
 * @example
 * type e0 = IsEmpty<never>       // false
 * type e0 = IsEmpty<''>          // true
 * type e1 = IsEmpty<' '>         // false
 * type e2 = IsEmpty<'foo'>       // false
 * type e3 = IsEmpty<'' | 'foo'>  // false
 */
export type IsEmpty<S extends string> = Equals<S, ''>;
/**
 * @since 0.0.2
 */
export type IsEmptyString<T> = T extends string ? IsEmpty<T> : false;
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