Implement a generic `TupleToUnion<T>` which covers the values of a tuple to its values union. Learn conditional types with `infer`, union type manipulation, tuple manipulation in this medium-level challenge on TypeScriptPro.
In this medium-level challenge, you'll implement a generic TupleToUnion<T> which converts the values of a tuple to a union.
Implement a generic TupleToUnion<T> which covers the values of a tuple to its values union.
For example
type Arr = ['1', '2', '3']
type Test = TupleToUnion<Arr> // expected to be '1' | '2' | '3'Change the following code to make the test cases pass (no type check errors).
// Video Solution: https://youtube.com/watch?v=RbGjjPWUetI
/* _____________ Your Code Here _____________ */
type TupleToUnion<T> = any
/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '../helpers'
type cases = [
Expect<Equal<TupleToUnion<[123, '456', true]>, 123 | '456' | true>>,
Expect<Equal<TupleToUnion<[123]>, 123>>,
]
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To convert a tuple to a union, we use indexed access:
[object Object]How it works:
T[number] accesses all numeric indices of the tuple - this produces a union of all tuple element types.
This challenge is originally from here.
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