arrayIncludes
A utility function to help removing type assertions when using Array.prototype.includes().
Example
const arr: Array<'a' | 'b' | 'c'> = ['a', 'b', 'c'];
const element: string = 'a';
// A type error occurs when using Array.prototype.includes,
// since string is not assignable to 'a' | 'b' | 'c'.
arr.includes(element);
// By using arrayIncludes, you can check if an element is included in the array,
// without type errors or type assertions.
arrayIncludes(arr, element);