Relative reference in generated .d.ts file in a monorepo

[wgcrouch]

When generating a .d.ts file, typescript is including a relative reference for an import, which is imported as a module.

import { a } from "@ts-bug/a";

export function b(text: string) {
  return a(text);
}

generated a definition file:

/// <reference path="../../a/index.d.ts" />
export declare function b(text: string): import("@ts-bug/a").AText;

In this case it is in a mono-repo which may be confusing things, but the reference should be the same as the import.

TypeScript Version:
3.0.3, but also happens with 3.1.0-dev.20180901

Search Terms:
relative reference paths
generated reference relative

Code
I have created a repo with a simple reproduction here https://github.com/wgcrouch/ts-bug

Expected behavior:
The reference /// <reference types="@ts-bug/a" />

Actual behavior:
The reference generated is /// <reference path="../../a/index.d.ts" />

Related Issues:
#26439

[RyanCavanaugh]

Probably a duplicate of the linked related issue

[sebinsua]

@RyanCavanaugh Yes - but this one has a reproduction repository so it should be easier for somebody to get to the root cause on.