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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer3.ts(14,1): error TS2322: Type '{ [x: number]: Base; }' is not assignable to type 'A'.
Index signatures are incompatible.
Property 'bar' is missing in type 'Base' but required in type 'Derived'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer3.ts(23,1): error TS2322: Type 'A' is not assignable to type '{ [x: number]: Derived2; }'.
Index signatures are incompatible.
Property 'baz' is missing in type 'Derived' but required in type 'Derived2'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer3.ts(33,9): error TS2322: Type '{ [x: number]: Derived; }' is not assignable to type 'A<T>'.
Index signatures are incompatible.
Type 'Derived' is not assignable to type 'T'.
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer3.ts (3 errors) ====
// Derived type indexer must be subtype of base type indexer
interface Base { foo: string; }
interface Derived extends Base { bar: string; }
interface Derived2 extends Derived { baz: string; }
class A {
[x: number]: Derived;
}
var a: A;
var b: { [x: number]: Base; };
a = b; // error
~
!!! error TS2322: Type '{ [x: number]: Base; }' is not assignable to type 'A'.
!!! error TS2322: Index signatures are incompatible.
!!! error TS2322: Property 'bar' is missing in type 'Base' but required in type 'Derived'.
!!! related TS2728 tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer3.ts:4:34: 'bar' is declared here.
b = a; // ok
class B2 extends A {
[x: number]: Derived2; // ok
}
var b2: { [x: number]: Derived2; };
a = b2; // ok
b2 = a; // error
~~
!!! error TS2322: Type 'A' is not assignable to type '{ [x: number]: Derived2; }'.
!!! error TS2322: Index signatures are incompatible.
!!! error TS2322: Property 'baz' is missing in type 'Derived' but required in type 'Derived2'.
!!! related TS2728 tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer3.ts:5:38: 'baz' is declared here.
module Generics {
class A<T extends Derived> {
[x: number]: T;
}
function foo<T extends Derived>() {
var a: A<T>;
var b: { [x: number]: Derived; };
a = b; // error
~
!!! error TS2322: Type '{ [x: number]: Derived; }' is not assignable to type 'A<T>'.
!!! error TS2322: Index signatures are incompatible.
!!! error TS2322: Type 'Derived' is not assignable to type 'T'.
b = a; // ok
var b2: { [x: number]: T; };
a = b2; // ok
b2 = a; // ok
}
}
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