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tests/cases/conformance/types/intersection/intersectionTypeInference.ts(5,5): error TS2322: Type 'T' is not assignable to type 'T & U'.
Type 'T' is not assignable to type 'U'.
'U' could be instantiated with an arbitrary type which could be unrelated to 'T'.
tests/cases/conformance/types/intersection/intersectionTypeInference.ts(6,5): error TS2322: Type 'U' is not assignable to type 'T & U'.
Type 'U' is not assignable to type 'T'.
'T' could be instantiated with an arbitrary type which could be unrelated to 'U'.
==== tests/cases/conformance/types/intersection/intersectionTypeInference.ts (2 errors) ====
function extend<T, U>(obj1: T, obj2: U): T & U {
var result: T & U;
obj1 = result;
obj2 = result;
result = obj1; // Error
~~~~~~
!!! error TS2322: Type 'T' is not assignable to type 'T & U'.
!!! error TS2322: Type 'T' is not assignable to type 'U'.
!!! error TS2322: 'U' could be instantiated with an arbitrary type which could be unrelated to 'T'.
!!! related TS2208 tests/cases/conformance/types/intersection/intersectionTypeInference.ts:1:17: This type parameter might need an `extends U` constraint.
result = obj2; // Error
~~~~~~
!!! error TS2322: Type 'U' is not assignable to type 'T & U'.
!!! error TS2322: Type 'U' is not assignable to type 'T'.
!!! error TS2322: 'T' could be instantiated with an arbitrary type which could be unrelated to 'U'.
!!! related TS2208 tests/cases/conformance/types/intersection/intersectionTypeInference.ts:1:20: This type parameter might need an `extends T` constraint.
return result;
}
var x = extend({ a: "hello" }, { b: 42 });
var s = x.a;
var n = x.b;
interface A<T> {
a: T;
}
interface B<U> {
b: U;
}
function foo<T, U>(obj: A<T> & B<U>): T | U {
return undefined;
}
var z = foo({ a: "hello", b: 42 });
var z: string | number;
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