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AI solution for TypeScript puzzle on BFE.dev
28. implement IsEmptyType<T>
Solution:
type IsEmptyType<T> = keyof T extends never ? true : false;
Explanation:
- We use
keyof T
to get the keys of the object type T. - If T is an empty object
{}
, then the keys of T would be the empty typenever
. - So, if
keyof T
isnever
, then T is an empty object type and we returntrue
. Otherwise, we returnfalse
.
Note:
IsEmptyType<any>
andIsEmptyType<object>
both evaluate tofalse
because they are not empty object types.any
is not an object type andobject
is a non-empty object type.IsEmptyType<Object>
evaluates tofalse
becauseObject
is a built-in constructor function in JavaScript and not an empty object type.