Import aliases don't work

[asakusuma]

import { Foo as MyType } from './foo';
export function bar(foo: MyType) {}

The docs don't recognize that foo is an instance of Foo. There is no link from MyType to Foo, and if you export the docs as JSON, the parameter foo is missing the reference id, unlike parameters who's types are not an alias.

[aciccarello]

Thanks for the report! I wonder if this is at all related to #393 since it involves renaming symbols.