In the edge case where the to-be-parsed string passed into xxxParse(...) methods is empty, the column property of the returned parsed array is undefined.

Although this is an edge case, it seems preferable to return an empty array of column names for consistency.

(Thanks @azoson for pointing this behaviour out in DefinitelyTyped/DefinitelyTyped#21092 and DefinitelyTyped/DefinitelyTyped#21162 . cc @gustavderdrache)