Description
TypeScript Version: 2.4.0 / nightly (2.5.0-dev.201xxxxx)
Code
// A *self-contained* demonstration of the problem follows...
function test<T extends string | number>(a: T): {[key: T]: boolean} {
const map: { [key: T]: boolean } = {};
return map;
}Expected behavior:
The type system should not complain that the key type of map should be string or number.
Actual behavior:
It gives error that the key of map should be string or number even though T is string or number