type-challenges/questions/10-medium-tuple-to-union

Tuple to Union

by Anthony Fu @antfu

Implement a generic TupleToUnion<T> which covers the values of a tuple to its values union.

For example

type Arr = ['1', '2', '3']

const a: TupleToUnion<Arr> // expected to be '1' | '2' | '3'