Builds an exclusive union type from a union type
C = ExclusifyUnion<A|B>
toto:C = {a: "tata"} OK
tata:C = {b: 123} OK
tutu: C = {a: "tata", b: 123} KO => Types of property 'a' are incompatible. Type 'string' is not assignable to type 'undefined'.
This is the kind of error shown when you add too many properties with this definition.
Builds an exclusive union type from a union type C = ExclusifyUnion<A|B> toto:C = {a: "tata"} OK tata:C = {b: 123} OK tutu: C = {a: "tata", b: 123} KO => Types of property 'a' are incompatible. Type 'string' is not assignable to type 'undefined'. This is the kind of error shown when you add too many properties with this definition.