message: chore: add triple-slash ref to asynciterable
  Closes
diff: /** @prettier */
  +
  +// https://github.com/microsoft/TypeScript/issues/40462#issuecomment-689879308
  +/// <reference lib="esnext.asynciterable" />
  +
  import { Observable } from './Observable';
  import { Subscription } from './Subscription';
  