35 lines
667 B
TypeScript
35 lines
667 B
TypeScript
interface IFoo<T> {
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foo(x: T): T;
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}
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var iFoo: IFoo<number>;
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iFoo.foo(1);
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class IntFooBad implements IFoo<number> { // error
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foo(x: string): string { return null; }
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}
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var intFooBad: IntFooBad;
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class IntFoo implements IFoo<number> {
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foo(x: number): number { return null; }
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}
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var intFoo: IntFoo;
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class StringFoo2 implements IFoo<string> {
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foo(x: string): string { return null; }
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}
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var stringFoo2: StringFoo2;
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stringFoo2.foo("hm");
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intFoo = stringFoo2; // error
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stringFoo2 = intFoo; // error
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class StringFoo3 implements IFoo<string> { // error
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foo<T>(x: T): T { return null; }
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}
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var stringFoo3: StringFoo3; |