37 lines
1.2 KiB
TypeScript
37 lines
1.2 KiB
TypeScript
//// [overloadresolutionWithConstraintCheckingDeferred.ts]
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interface A { x }
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interface B { x; y }
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interface C { z }
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interface D { q }
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class G<T extends A> {
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constructor(x: T) { }
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}
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declare function foo(arg: (x: D) => number): string;
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declare function foo(arg: (x: C) => any): string;
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declare function foo(arg: (x: B) => any): number;
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var result: number = foo(x => new G(x)); // x has type D, new G(x) fails, so first overload is picked.
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var result2: number = foo(x => new G<typeof x>(x)); // x has type D, new G(x) fails, so first overload is picked.
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var result3: string = foo(x => { // x has type D
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var y: G<typeof x>; // error that D does not satisfy constraint, y is of type G<D>, entire call to foo is an error
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return y;
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});
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//// [overloadresolutionWithConstraintCheckingDeferred.js]
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var G = (function () {
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function G(x) {
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}
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return G;
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})();
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var result = foo(function (x) { return new G(x); }); // x has type D, new G(x) fails, so first overload is picked.
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var result2 = foo(function (x) { return new G(x); }); // x has type D, new G(x) fails, so first overload is picked.
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var result3 = foo(function (x) {
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var y; // error that D does not satisfy constraint, y is of type G<D>, entire call to foo is an error
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return y;
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});
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