Look at this type:
type MyType =
| { a: number }
| { b: number }
| { c: number }
| ({ b: number } & { c: number });
I want to forbid combination of a with b or c.
const o1: MyType = { a: 10 }; // only a: OK
const o2: MyType = { b: 10 }; // only b: OK
const o3: MyType = { c: 10 }; // only c: OK
const o4: MyType = { b: 10, c: 10 }; // combine b and c: OK
// const o5: MyType = {}; // Forbidden (no fields)
const o6: MyType = { a: 10, b: 10 }; // Forbidden (I should not be able to combine a and b)
I don't understand because typescript allows me to instantiate o6. It should not because I don't want to see a and b together...
Any ideas?
Thanks
