Positional

import { first, second, third, last } from 'op-array/positional';

Each returns T | undefined so empty-array handling is surfaced at the type level.

first([10, 20, 30]);  // 10
second([10, 20, 30]); // 20
third([10, 20, 30]);  // 30
last([10, 20, 30]);   // 30

first([]);            // undefined
last([10]);           // 10