48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
==== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithNumericIndexer.ts (2 errors) ====
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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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class A {
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[x: number]: Base;
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}
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class B extends A {
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[x: number]: Derived; // ok
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}
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class 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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class A<T extends Base> {
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[x: number]: T;
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}
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class B extends A<Base> {
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[x: number]: Derived; // ok
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}
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class B2 extends A<Base> {
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[x: number]: Derived2; // ok
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}
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class B3<T extends Base> extends A<T> {
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~~
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!!! Class 'B3<T>' incorrectly extends base class 'A<T>':
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!!! Index signatures are incompatible:
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!!! Type 'Derived' is not assignable to type 'T'.
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[x: number]: Derived; // error, BUG?
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}
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class B4<T extends Base> extends A<T> {
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~~
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!!! Class 'B4<T>' incorrectly extends base class 'A<T>':
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!!! Index signatures are incompatible:
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!!! Type 'Derived2' is not assignable to type 'T'.
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[x: number]: Derived2; // error, BUG?
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}
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} |