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tests/cases/compiler/inheritedStringIndexersFromDifferentBaseTypes.ts(13,11): error TS2430: Interface 'E' incorrectly extends interface 'D'.
Index signatures are incompatible.
Type 'number' is not assignable to type 'string'.
tests/cases/compiler/inheritedStringIndexersFromDifferentBaseTypes.ts(28,11): error TS2430: Interface 'E2' incorrectly extends interface 'D2'.
Index signatures are incompatible.
Type 'number' is not assignable to type 'string'.
==== tests/cases/compiler/inheritedStringIndexersFromDifferentBaseTypes.ts (2 errors) ====
// string indexer tests
interface A {
[s: string]: number;
}
interface B {
[s: string]: number;
}
interface C extends A, B { } // ok
interface D {
[s: string]: string;
}
interface E extends A, D { } // error
~
!!! error TS2430: Interface 'E' incorrectly extends interface 'D'.
!!! error TS2430: Index signatures are incompatible.
!!! error TS2430: Type 'number' is not assignable to type 'string'.
// Same tests for number indexer
interface A2 {
[s: number]: number;
}
interface B2 {
[s: number]: number;
}
interface C2 extends A2, B2 { } // ok
interface D2 {
[s: number]: string;
}
interface E2 extends A2, D2 { } // error
~~
!!! error TS2430: Interface 'E2' incorrectly extends interface 'D2'.
!!! error TS2430: Index signatures are incompatible.
!!! error TS2430: Type 'number' is not assignable to type 'string'.
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