Unhelpful extra error that class prototype isn't assignable to superclass prototype

TypeScript Version: 3.1.0-dev.20180801

Code

interface A {
    n: number;
}
declare var A: {
    prototype: A;
    new(): A;
};

class B extends A {
    n = "";
}

Expected behavior:

One error: Property 'n' in type 'B' is not assignable to the same property in base type 'A'.

Actual behavior:

Two errors:

src/a.ts:9:7 - error TS2417: Class static side 'typeof B' incorrectly extends base class static side '{ prototype: A; }'.
  Types of property 'prototype' are incompatible.
    Type 'B' is not assignable to type 'A'.
      Types of property 'n' are incompatible.
        Type 'string' is not assignable to type 'number'.

9 class B extends A {
        ~

src/a.ts:10:5 - error TS2416: Property 'n' in type 'B' is not assignable to the same property in base type 'A'.
  Type 'string' is not assignable to type 'number'.

10     n = "";

We could just omit static-side errors if instance-side errors exist.

[RyanCavanaugh]

Seems unambiguously better