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tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithCallSignaturesWithSpecializedSignatures.ts(70,15): error TS2430: Interface 'I2' incorrectly extends interface 'Base2'.
Types of property 'a' are incompatible.
Type '(x: string) => string' is not assignable to type '{ (x: "a"): number; (x: string): number; }'.
Type 'string' is not assignable to type 'number'.
==== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithCallSignaturesWithSpecializedSignatures.ts (1 errors) ====
// same as subtypingWithCallSignatures but with additional specialized signatures that should not affect the results
module CallSignature {
interface Base { // T
// M's
(x: 'a'): void;
(x: string, y: number): void;
}
// S's
interface I extends Base {
// N's
(x: 'a'): number; // ok because base returns void
(x: string, y: number): number; // ok because base returns void
<T>(x: T): string; // ok because base returns void
}
interface Base2 { // T
// M's
(x: 'a'): number;
(x: string): number;
}
// S's
interface I2 extends Base2 {
// N's
(x: 'a'): string;
(x: string): 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: 'a'): void;
(x: string): void;
}
a2: {
(x: 'a', y: number): void;
(x: string, y: number): void;
}
a3: <T>(x: T) => void;
}
// S's
interface I extends Base {
// N's
a: (x: string) => number; // ok because base returns void
a2: (x: string, 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: 'a'): number;
(x: string): 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: string) => string' is not assignable to type '{ (x: "a"): number; (x: string): number; }'.
!!! error TS2430: Type 'string' is not assignable to type 'number'.
// N's
a: (x: string) => string; // error because base returns non-void;
}
// S's
interface I3 extends Base2 {
// N's
a2: <T>(x: T) => string; // error because base returns non-void;
}
}
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