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prettier Show nullable.js Source code

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  1. function foo():string { return null; }
  2.  
  3. function bar():?string { return null; }
  4.  
  5. function qux(x:string) { }
  6.  
  7. function corge(x:number) { }
  8.  
  9. var x = bar(); // x: ?string
  10. if (x != null) qux(x); // x: ?string | null
  11. if (x != null) corge(x); // x: ?string | null
  12.  
  13. function grault() { x = null; }
  14. if (x != null) {
  15.   grault(); qux(x);
  16. }
  17.  
  18. var array_of_nullable: Array<?number> = [null, 3];
  19.  
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