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  1. /* @flow */
  2.  
  3. var sealed = {one: 'one', two: 'two'};
  4. (Object.keys(sealed): Array<'one'|'two'>);
  5. (Object.keys(sealed): void); // error, Array<string>
  6.  
  7. var unsealed = {};
  8. Object.keys(unsealed).forEach(k => {
  9.   (k : number) // error: string ~> number
  10. });
  11.  
  12. var dict: { [k: number]: string } = {};
  13. Object.keys(dict).forEach(k => {
  14.   (k : number) // error: string ~> number
  15. });
  16.  
  17. var any: Object = {};
  18. (Object.keys(any): Array<number>); // error, Array<string>
  19.  
  20. class Foo {
  21.   prop: string;
  22.   foo() {}
  23. }
  24. // constructor and foo not enumerable
  25. (Object.keys(new Foo()): Array<'error'>); // error: prop ~> error
  26.  
  27. class Bar extends Foo {
  28.   bar_prop: string;
  29.   bar() {}
  30. }
  31. // only own enumerable props
  32. (Object.keys(new Bar()): Array<'error'>); // error: bar_prop ~> error
  33.  
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