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  1. /* @flow */
  2. function foo(x?: string): string {
  3.     if (x == null) { return 'foo'; }
  4.     return x;
  5. }
  6.  
  7. function bar(obj: {x?: string}): string {
  8.     if (obj.x == null) { return 'foo'; }
  9.     return obj.x;
  10. }
  11.  
  12. function baz(bar?) {
  13.     if (!bar) { return 1; }
  14.     return bar.duck
  15. }
  16.  
  17. function testOptionalNullable(x?: ?string): string {
  18.     if (x == null) { return 'foo'; }
  19.     return x;
  20. }
  21.  
  22. function testOptionalNullableDefault(x?: ?string = "hi"): string {
  23.     if (x == null) { return 'foo'; }
  24.     return x;
  25. }
  26.  
  27. function testOptionalNullableProperty(obj: {x?: ?string}): string {
  28.     if (obj.x == null) { return 'foo'; }
  29.     return obj.x;
  30. }
  31.  
  32. function testOptionalNullableFlowingToNullable(x?: ?string): ?string {
  33.   var f = function(y: ?string) {};
  34.   f(x);
  35. }
  36.  
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