tree-shakable wrapper for turning a typescript tuple into a typeguard

typeguard-tuple.ts

import type { Primitive } from 'type-fest';
interface TypeguardTuple<T> extends Omit<readonly [T, ...T[]], never> {
  includes(searchElement: unknown): searchElement is T;
  includes(searchElement: T, fromIndex?: number): boolean;
}
const typeguardTuple = <T extends Primitive>(tuple: readonly [T, ...T[]]) =>
  tuple as Omit<readonly [T, ...T[]], never> as TypeguardTuple<T>;