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prettier Show optional_param4.js Source code

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  1. /* @flow */
  2.  
  3. function foo(x?: number, ...y: Array<string>): [?number, Array<string>] {
  4.   return [x, y];
  5. }
  6.  
  7. foo(); // OK
  8. foo(123), // OK
  9. foo(123, 'hello'); // OK
  10.  
  11.  
  12. foo(true); // ERROR boolean ~> number
  13. foo(123, true); // ERROR boolean ~> string
  14.  
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