tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts(15,1): error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived; }'. Index signatures are incompatible. Type 'Base' is not assignable to type 'Derived'. Property 'bar' is missing in type 'Base'. tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts(19,1): error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived2; }'. Index signatures are incompatible. Type 'Base' is not assignable to type 'Derived2'. Property 'baz' is missing in type 'Base'. tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts(33,5): error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived; }'. Index signatures are incompatible. Type 'Base' is not assignable to type 'Derived'. tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts(41,5): error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived2; }'. Index signatures are incompatible. Type 'Base' is not assignable to type 'Derived2'. tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts(46,9): error TS2322: Type '{ [x: string]: Derived; }' is not assignable to type 'A'. Index signatures are incompatible. Type 'Derived' is not assignable to type 'T'. tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts(47,9): error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived; }'. Index signatures are incompatible. Type 'T' is not assignable to type 'Derived'. tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts(50,9): error TS2322: Type '{ [x: string]: Derived2; }' is not assignable to type 'A'. Index signatures are incompatible. Type 'Derived2' is not assignable to type 'T'. tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts(51,9): error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived2; }'. Index signatures are incompatible. Type 'T' is not assignable to type 'Derived2'. ==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithStringIndexer.ts (8 errors) ==== // index signatures must be compatible in assignments interface Base { foo: string; } interface Derived extends Base { bar: string; } interface Derived2 extends Derived { baz: string; } class A { [x: string]: Base; } var a: A; var b: { [x: string]: Derived; } a = b; // ok b = a; // error ~ !!! error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived; }'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'Base' is not assignable to type 'Derived'. !!! error TS2322: Property 'bar' is missing in type 'Base'. var b2: { [x: string]: Derived2; } a = b2; // ok b2 = a; // error ~~ !!! error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived2; }'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'Base' is not assignable to type 'Derived2'. !!! error TS2322: Property 'baz' is missing in type 'Base'. module Generics { class A { [x: string]: T; } class B extends A { [x: string]: Derived; // ok } var b1: { [x: string]: Derived; }; var a1: A; a1 = b1; // ok b1 = a1; // error ~~ !!! error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived; }'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'Base' is not assignable to type 'Derived'. class B2 extends A { [x: string]: Derived2; // ok } var b2: { [x: string]: Derived2; }; a1 = b2; // ok b2 = a1; // error ~~ !!! error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived2; }'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'Base' is not assignable to type 'Derived2'. function foo() { var b3: { [x: string]: Derived; }; var a3: A; a3 = b3; // error ~~ !!! error TS2322: Type '{ [x: string]: Derived; }' is not assignable to type 'A'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'Derived' is not assignable to type 'T'. b3 = a3; // error ~~ !!! error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived; }'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'T' is not assignable to type 'Derived'. var b4: { [x: string]: Derived2; }; a3 = b4; // error ~~ !!! error TS2322: Type '{ [x: string]: Derived2; }' is not assignable to type 'A'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'Derived2' is not assignable to type 'T'. b4 = a3; // error ~~ !!! error TS2322: Type 'A' is not assignable to type '{ [x: string]: Derived2; }'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'T' is not assignable to type 'Derived2'. } }