TypeScript Version: 3.0.3

Explicitly marked positive integers are not recognized in a type pattern:

    foo(direction: -1 | 1 | -2 | +2) { }

Likewise, calling it using a perfectly legit integer fails with TS2345:

Expected behavior:

As everywhere else, the unary operator + should be allowed in a type pattern.
This is not urgent, just for completeness.