54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
/**
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* @flow
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*/
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var z: number = 123;
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class A {}
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class B extends A {}
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class C extends A {}
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type T = {
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get goodGetterWithAnnotation(): number,
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set goodSetterWithAnnotation(x: number): void,
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get propWithMatchingGetterAndSetter(): number,
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set propWithMatchingGetterAndSetter(x: number): void,
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// The getter and setter need not have the same type
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get propWithSubtypingGetterAndSetter(): ?number, // OK
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set propWithSubtypingGetterAndSetter(x: number): void,
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set propWithSubtypingGetterAndSetterReordered(x: number): void, // OK
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get propWithSubtypingGetterAndSetterReordered(): ?number,
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get exampleOfOrderOfGetterAndSetter(): A,
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set exampleOfOrderOfGetterAndSetter(x: B): void,
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set exampleOfOrderOfGetterAndSetterReordered(x: B): void,
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get exampleOfOrderOfGetterAndSetterReordered(): A,
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};
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function test(obj: T) {
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// Test getting properties with getters
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var testGetterNoError2: number = obj.goodGetterWithAnnotation;
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var testGetterWithError2: string = obj.goodGetterWithAnnotation; // Error number ~> string
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// Test setting properties with getters
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obj.goodSetterWithAnnotation = 123;
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obj.goodSetterWithAnnotation = "hello"; // Error string ~> number
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var testSubtypingGetterAndSetter: number = obj.propWithSubtypingGetterAndSetter; // Error ?number ~> number
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// When building this feature, it was tempting to flow the setter into the
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// getter and then use either the getter or setter as the type of the
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// property. This example shows the danger of using the getter's type
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obj.exampleOfOrderOfGetterAndSetter = new C(); // Error C ~> B
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// And this example shows the danger of using the setter's type.
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var testExampleOrOrderOfGetterAndSetterReordered: number =
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obj.exampleOfOrderOfGetterAndSetterReordered; // Error A ~> B
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}
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