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IsNever medium #union #utils

by hiroya iizuka @hiroyaiizuka

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Implement a type IsNever, which takes input type T. If the type of resolves to never, return true, otherwise false.

For example:

type A = IsNever<never>  // expected to be true
type B = IsNever<undefined> // expected to be false
type C = IsNever<null> // expected to be false
type D = IsNever<[]> // expected to be false
type E = IsNever<number> // expected to be false

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