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=== tests/cases/compiler/baseIndexSignatureResolution.ts ===
class Base { private a: string; }
>Base : Base
>a : string
class Derived extends Base { private b: string; }
>Derived : Derived
>Base : Base
>b : string
// Note - commmenting "extends Foo" prevents the error
interface Foo {
[i: number]: Base;
>i : number
}
interface FooOf<TBase extends Base> extends Foo {
[i: number]: TBase;
>i : number
}
var x: FooOf<Derived> = null;
>x : FooOf<Derived>
>null : null
var y: Derived = x[0];
>y : Derived
>x[0] : Derived
>x : FooOf<Derived>
>0 : 0
/*
// Note - the equivalent for normal interface methods works fine:
interface A {
foo(): Base;
}
interface B<TBase extends Base> extends A {
foo(): TBase;
}
var b: B<Derived> = null;
var z: Derived = b.foo();
*/
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