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