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  1. // @flow
  2.  
  3. // Feature check:
  4. // The predicate function is defined after the conditional check
  5.  
  6. function foo(x: string | Array<string>): string {
  7.   if (is_string(x)) {
  8.     // The use of `is_string` as a conditional check
  9.     // should guarantee the narrowing of the type of `x`
  10.     // to string.
  11.     return x;
  12.   } else {
  13.     // Accordingly the negation of the above check
  14.     // guarantees that `x` here is an Array<string>
  15.     return x.join();
  16.   }
  17. }
  18.  
  19. function is_string(x): %checks {
  20.   return typeof x === "string";
  21. }
  22.  
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