title: Missing return type on function in Jest / eslint
body: <p>I have this Jest in my project</p>
  <pre><code>const action = async () =&gt; {
                  await hotelService.getByIdAsync(Identifier);
  };
  
  await expect(action()).rejects.toThrowError(FunctionalError);
  </code></pre>
  <p>but I have this eslint error</p>
  <pre><code> 92:28  error  Missing return type on function  @typescript-eslint/explicit-function-return-type
  </code></pre>