Type Alias hyperlinks do not work

[yohei1126]

The type of the parameter callback: callbacks.Callback on setCallback is documented as type Callback but no link to the type alias Callback is created.
Here is my code.
https://gist.github.com/yohei1126/238650e60378e669b86cf19debf29abc

src/Callbacks.ts

export type Callback = () => void;

src/Sample.ts

import * as callbacks from "./Callbacks";
export class Sample {
    private callback: callbacks.Callback;
    setCallback(callback: callbacks.Callback): void {
        this.callback = callback;
    }
}