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  1. /**
  2.  * @flow
  3.  */
  4.  
  5. var z: number = 123;
  6.  
  7. class A {}
  8. class B extends A {}
  9. class C extends A {}
  10.  
  11. var obj = {
  12.   get goodGetterNoAnnotation() { return 4; },
  13.   get goodGetterWithAnnotation(): number { return 4; },
  14.  
  15.   set goodSetterNoAnnotation(x) { z = x; },
  16.   set goodSetterWithAnnotation(x: number) { z = x; },
  17.  
  18.   get propWithMatchingGetterAndSetter(): number { return 4; },
  19.   set propWithMatchingGetterAndSetter(x: number) { },
  20.  
  21.   // The getter and setter need not have the same type
  22.   get propWithSubtypingGetterAndSetter(): ?number { return 4; }, // OK
  23.   set propWithSubtypingGetterAndSetter(x: number) { },
  24.  
  25.   set propWithSubtypingGetterAndSetterReordered(x: number) { }, // OK
  26.   get propWithSubtypingGetterAndSetterReordered(): ?number { return 4; },
  27.  
  28.   get exampleOfOrderOfGetterAndSetter(): A { return new A(); },
  29.   set exampleOfOrderOfGetterAndSetter(x: B) {},
  30.  
  31.   set exampleOfOrderOfGetterAndSetterReordered(x: B) {},
  32.   get exampleOfOrderOfGetterAndSetterReordered(): A { return new A(); },
  33.  
  34.   set [z](x: string) {},
  35.   get [z](): string { return string; },
  36. };
  37.  
  38.  
  39.  
  40. // Test getting properties with getters
  41. var testGetterNoError1: number = obj.goodGetterNoAnnotation;
  42. var testGetterNoError2: number = obj.goodGetterWithAnnotation;
  43.  
  44. var testGetterWithError1: string = obj.goodGetterNoAnnotation; // Error number ~> string
  45. var testGetterWithError2: string = obj.goodGetterWithAnnotation; // Error number ~> string
  46.  
  47. // Test setting properties with getters
  48. obj.goodSetterNoAnnotation = 123;
  49. obj.goodSetterWithAnnotation = 123;
  50.  
  51. obj.goodSetterNoAnnotation = "hello"; // Error string ~> number
  52. obj.goodSetterWithAnnotation = "hello"; // Error string ~> number
  53.  
  54. var testSubtypingGetterAndSetter: number = obj.propWithSubtypingGetterAndSetter; // Error ?number ~> number
  55.  
  56. // When building this feature, it was tempting to flow the setter into the
  57. // getter and then use either the getter or setter as the type of the property.
  58. // This example shows the danger of using the getter's type
  59. obj.exampleOfOrderOfGetterAndSetter = new C(); // Error C ~> B
  60.  
  61. // And this example shows the danger of using the setter's type.
  62. var testExampleOrOrderOfGetterAndSetterReordered: number =
  63.   obj.exampleOfOrderOfGetterAndSetterReordered; // Error A ~> B
  64.  
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