typeToString for type alias defined in different file does not use the type alias name

[ghost]

TypeScript Version: nightly (2.5.0-dev.20170712)

Code

a.ts

import { f } from "./b";
f({ x: 1 });

b.ts

export type X = { x: number };
export function f(x: X): void {}

Hover over f.

Expected behavior:

(alias) f(x: X): void

Actual behavior:

(alias) f(x: {
    x: number;
}): void

[ghost]

We should also just put a limit on how much we're willing to write. I noticed a long pause when hovering over Diagnostics in our codebase, which is a huge object literal, with an equally large inferred type.