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IsUnion medium #union

by null @bencor

Take the Challenge

Implement a type IsUnion, which takes an input type T and returns whether T resolves to a union type.

For example:

type case1 = IsUnion<string>  // false
type case2 = IsUnion<string|number>  // true
type case3 = IsUnion<[string|number]>  // false

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