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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/callSignatureAssignabilityInInheritance.ts(57,15): error TS2430: Interface 'I2' incorrectly extends interface 'Base2'.
Types of property 'a' are incompatible.
Type '(x: number) => string' is not assignable to type '(x: number) => number'.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/callSignatureAssignabilityInInheritance.ts(63,15): error TS2430: Interface 'I3' incorrectly extends interface 'Base2'.
Types of property 'a2' are incompatible.
Type '<T>(x: T) => string' is not assignable to type '<T>(x: T) => T'.
Type 'string' is not assignable to type 'T'.
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/callSignatureAssignabilityInInheritance.ts (2 errors) ====
module CallSignature {
interface Base { // T
// M's
(x: number): void;
(x: number, y: number): void;
}
// S's
interface I extends Base {
// N's
(x: number): number; // ok because base returns void
(x: number, y: number): boolean; // ok because base returns void
<T>(x: T): string; // ok because base returns void
}
interface Base2 { // T
// M's
(x: number): number;
}
// S's
interface I2 extends Base2 {
// N's
(x: number): string; // error because base returns non-void;
}
// S's
interface I3 extends Base2 {
// N's
<T>(x: T): string; // ok, adds a new call signature
}
}
module MemberWithCallSignature {
interface Base { // T
// M's
a: (x: number) => void;
a2: (x: number, y: number) => void;
a3: <T>(x: T) => void;
}
// S's
interface I extends Base {
// N's
a: (x: number) => number; // ok because base returns void
a2: (x: number, y: number) => boolean; // ok because base returns void
a3: <T>(x: T) => string; // ok because base returns void
}
interface Base2 { // T
// M's
a: (x: number) => number;
a2: <T>(x: T) => T;
}
// S's
interface I2 extends Base2 {
~~
!!! error TS2430: Interface 'I2' incorrectly extends interface 'Base2'.
!!! error TS2430: Types of property 'a' are incompatible.
!!! error TS2430: Type '(x: number) => string' is not assignable to type '(x: number) => number'.
!!! error TS2430: Type 'string' is not assignable to type 'number'.
// N's
a: (x: number) => string; // error because base returns non-void;
}
// S's
interface I3 extends Base2 {
~~
!!! error TS2430: Interface 'I3' incorrectly extends interface 'Base2'.
!!! error TS2430: Types of property 'a2' are incompatible.
!!! error TS2430: Type '<T>(x: T) => string' is not assignable to type '<T>(x: T) => T'.
!!! error TS2430: Type 'string' is not assignable to type 'T'.
// N's
a2: <T>(x: T) => string; // error because base returns non-void;
}
}
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