TypeScript Version:

1.8.2

Code

import {BehaviorSubject} from 'rxjs/Rx';

class Foo extends BehaviorSubject<string> {
}

class Bar extends BehaviorSubject<any>{
}

var ARRAY = [
    Foo,
    Bar,
];

The BehaviorSubject is a requirement, just using a local, generic class makes it work. I haven't tried further reducing the base class. Once you comment out one of the two array members, the compiler doesn't hang anymore.

Here is my package.json snippet:

  "devDependencies": {
    "typescript": "1.8.2"
  },
  "dependencies": {
    "rxjs": "5.0.0-beta.2"
  }