47 lines
980 B
JavaScript
47 lines
980 B
JavaScript
//// [subtypingWithNumericIndexer2.ts]
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// Derived type indexer must be subtype of base type indexer
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interface Base { foo: string; }
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interface Derived extends Base { bar: string; }
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interface Derived2 extends Derived { baz: string; }
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interface A {
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[x: number]: Derived;
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}
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interface B extends A {
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[x: number]: Base; // error
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}
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interface B2 extends A {
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[x: number]: Derived2; // ok
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}
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module Generics {
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interface A<T extends Derived> {
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[x: number]: T;
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}
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interface B extends A<Base> {
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[x: number]: Derived; // error
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}
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interface B2 extends A<Derived> {
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[x: number]: Derived2; // ok
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}
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interface B3<T extends Derived> extends A<T> {
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[x: number]: Base; // error
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}
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interface B4<T extends Derived> extends A<T> {
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[x: number]: Derived; // error
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}
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interface B5<T extends Derived2> extends A<T> {
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[x: number]: Derived2; // error
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}
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}
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//// [subtypingWithNumericIndexer2.js]
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