es-toolkit/dist/types/NonEmptyArray.d.ts

A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

//#region src/types/NonEmptyArray.d.ts
/**
 * An array guaranteed to have at least one element.
 * The first element resolves to `T` instead of `T | undefined`.
 *
 * @template T - The type of the elements.
 *
 * @example
 * const a: NonEmptyArray<number> = [1, 2, 3]; // ok
 * const b: NonEmptyArray<number> = [];        // error: empty array not allowed
 */
type NonEmptyArray<T> = [T, ...T[]];
//#endregion
export { NonEmptyArray };