[AnkhMorporkian]

If you're going ES6, why not just:

  import {solve} from 'logic'
  
  solve((x,y) => x === "mcbob" && y === "bob" || x === "bob" && y === "bill");

[danappelxx]

Just because you can use the shorthand syntax, doesn't mean you always should.

[shriek]

I wouldn't say it's that bad. A curly brace would make it a bit clearer though.

[elbear]

I prefer my code to be more than "it's not that bad" when it comes to readability.