Summary

Given
TUPLE: Any tuple

Provide
A type that defines an object type whose keys and the corresponding value types would be the tuple indices and the corresponding tuple element types.

Potential definition

type TupleToObject<TUPLE> = { [I in keyof TUPLE & `${number}`]: TUPLE[I] }

Reference
https://stackoverflow.com/a/75746375/22340824
https://stackoverflow.com/a/70398429/22340824

Use case

Get union of bool elements indices.

const arr = [true, false, 'test'] as const;
type BoolIndices = StringToNumber<ConditionalKeys<TupleToObject<typeof arr>, boolean>>;