Generic type breaks line in none expected way

Prettier 1.15.2 Playground link

--parser typescript
--print-width 100
--single-quote
--use-tabs

Input:

fetchPaymentsResult$ = (this.actions$.ofType(FETCH_PAYMENT_OVERVIEW) as Observable<Action>).switchMap(() =>
    this.paymentsService
      .fetch()
  );

Output:

fetchPaymentsResult$ = (this.actions$.ofType(FETCH_PAYMENT_OVERVIEW) as Observable<
	Action
>).switchMap(() => this.paymentsService.fetch());

Expected behavior: This Observable<Action> should not be broken apart. An acceptable output would be

fetchPaymentsResult$ = (this.actions$.ofType(FETCH_PAYMENT_OVERVIEW) as 
  Observable<Action>).switchMap(() => this.paymentsService.fetch());

[j-f1]

If someone created a PR to fix this, would you accept it?

Probably, as long as it includes tests and doesn’t add an option 😃

[BernhardFuchs]

Not sure. #5399 happens when chaining, this one is when assigning a type.