31 lines
1004 B
JavaScript
31 lines
1004 B
JavaScript
/* @noflow */
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interface IFoo { foo: string }
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class C1 implements IFoo {} // error: property `foo` not found
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class C2 implements IFoo { foo: number } // error: number <~> string
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class C3 implements IFoo { foo: string } // ok
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(new C1: IFoo); // ok, we already errored at def site
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interface IBar { bar: number }
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class C4 implements IFoo, IBar {} // error: properties `foo`, `bar` not found
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(new C4: IBar); // ok, we already errored at def site
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interface IFooBar extends IFoo { bar: number }
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class C5 implements IFooBar {} // error: properties `foo`, `bar` not found
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(new C5: IFooBar); // ok, already errored at def site
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(new C5: IFoo); // ok, already errored at def site
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(new C5: IBar); // error: property `bar` not found (despite IBar < IFooBar)
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class C6 extends C1 {}
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(new C6: IFoo); // ok, C1 implements IFoo
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class C7 implements C1 {} // error: C1 is a class, expected an interface
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// ensure BoundT substituted appropriately
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interface IPoly<T> { x: T }
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class C8<T> implements IPoly<T> { x: T }
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