50 lines
890 B
TypeScript
50 lines
890 B
TypeScript
// interfaces that merge must not have members that conflict
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interface A {
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foo(x: number): number;
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foo(x: string): string;
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}
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interface A {
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foo(x: Date): Date;
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}
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interface B<T> {
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foo(x: T): number;
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foo(x: string): string;
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}
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interface B<T> {
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foo(x: T): Date;
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foo(x: Date): string;
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}
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var b: B<boolean>;
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var r = b.foo(true); // returns Date
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// add generic overload
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interface C<T, U> {
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foo(x: T, y: U): string;
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foo(x: string, y: string): number;
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}
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interface C<T, U> {
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foo<W>(x: W, y: W): W;
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}
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var c: C<boolean, Date>;
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var r2 = c.foo(1, 2); // number
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// add generic overload that would be ambiguous
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interface D<T, U> {
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a: T;
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b: U;
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foo<A>(x: A, y: A): U;
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}
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interface D<T, U> {
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foo<W>(x: W, y: W): T;
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}
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var d: D<boolean, Date>;
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var r3 = d.foo(1, 1); // boolean, last definition wins
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