is-tuple

IsTuple<Type> returns Type when type Type is tuple. Otherwise returns never

type IsArrayTuple = IsTuple<number[]>;
//   ^? never
type IsReadonlyArrayTuple = IsTuple<readonly number[]>;
//   ^? never
type IsTupleTuple = IsTuple<[number]>;
//   ^? [number]

⚠️ Limitations

• Returns Type or never instead of true or false (it will be addressed in #353)