Types

Last-of-array.ts

const dataArray = ['A', 'B', 'C', 'D', 'E'] as const;

type data = [...(typeof dataArray)];

type Last<T extends any[]> =  T extends [...infer _, infer R] ? R : never;

const last: Last<data> = 'E'

Last-of-array_readonly.ts

const dataArray = ['A', 'B', 'C', 'D', 'E'] as const;

type Data = typeof dataArray;

type Last<T extends readonly any[]> = T extends readonly [...infer _, infer R] ? R : never;

const last: Last<Data> = 'E';