Parse error with ternary in JSX with mixed variables and JSX

[Guria]

TypeScript Version: 2.9.0-dev.20180515

Search Terms: ternary, ternary tsx

Code

Here is working code

import * as React from "react";
const emptyMessage = <div>empty</div>;
const length = 0;
const totalItemsCount = 10;
const getPlural = (...args: any[]) => "";
const a = (
  <div>
    <div>
      {length ? emptyMessage : (
        <span>
          Всего {totalItemsCount}{" "}
          {getPlural(totalItemsCount, ["услуга", "услуги", "услуг"])} в этом
          разделе
        </span>
      )}
    </div>
  </div>
);

after applying prettier on this code we have:

import * as React from "react";
const emptyMessage = <div>empty</div>;
const length = 0;
const totalItemsCount = 10;
const getPlural = (...args: any[]) => "";
const a = (
  <div>
    <div>
      {length ? (
        emptyMessage
      ) : (
        <span>
          Всего {totalItemsCount}{" "}
          {getPlural(totalItemsCount, ["услуга", "услуги", "услуг"])} в этом
          разделе
        </span>
      )}
    </div>
  </div>
);

As we see prettier added a parenthesis around emptyMessage which shouldn't affect parsing since this is a valid syntax. But typescript reports error:

[ts] A function whose declared type is neither 'void' nor 'any' must return a value.

The interesting part here, that if we simplify else part it will start work again:

import * as React from "react";
const emptyMessage = <div>empty</div>;
const length = 0;
const totalItemsCount = 10;
const getPlural = (...args: any[]) => "";
const a = (
  <div>
    <div>
      {length ? (
        emptyMessage
      ) : (
        <span>
          {getPlural(totalItemsCount, ["услуга", "услуги", "услуг"])} в этом
          разделе
        </span>
      )}
    </div>
  </div>
);

It appears enough to remove first line Всего {totalItemsCount}{" "} inside span where we have string literal, and 2 expressions.
I tried to change this first line in different combinations (just literal, just expressions, etc) but only complete removal of this exact line helps. o_O

Expected behavior: Compile in any case above

Actual behavior: Some cases led to parsing error

Playground Link: https://codesandbox.io/s/3z83kpxp1 (hit Prettify icon in top right corner under profile menu)

Related Issues: #16241

I am starting issue here and not in prettier repo, since I am sure that all snippets above are valid syntax,

[Guria]

Wow, that was fast.
Impressive.