Returns true if the value is a user class only, as opposed to a "normal" functions OR non user-defined class, i.e the internal ones like Promise, Object, Array, Set, Map etc
z.isClass
z.functionType
Returns true if the value is a user class only, as opposed to a "normal" functions OR non user-defined class, i.e the internal ones like Promise, Object, Array, Set, Map etc
See
z.isClassfor the more inclusive onez.functionTypefor the underlying function