Can someone help me understand why a conflicting type intersection did not produce a type of never? What am I overlooking?
type A = {value: string}
type B = {value: number}
type D = A & B
type E<T> = T extends never ? 'never' : 'something';
type F = E<D> // I was expecting 'never', but got 'something';
In this scenario, it's important to note that only the conflicting property within the object type D has the never type assigned to it. The other properties in the type may still function correctly. Therefore, while D["value"] results in a type of never, the overall type D remains intact:
type A = {name: string}
type B = {age: number}
type D = A & B
type E<T> = T extends never ? 'never' : 'something';
type F = E<D>;
// ^?−− type F = "something"
type F2 = E<D["age"]>;
// ^?−− type F2 = "never"
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