instanceofWithPrimitiveUnion.ts(2,9): error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.
instanceofWithPrimitiveUnion.ts(8,9): error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.


==== instanceofWithPrimitiveUnion.ts (2 errors) ====
    function test1(x: number | string) {
        if (x instanceof Object) {
            ~
!!! error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.
            x;
        }
    }
    
    function test2(x: (number | string) | number) {
        if (x instanceof Object) {
            ~
!!! error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.
            x;
        }
    }
    