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//// [callSignatureAssignabilityInInheritance.ts]
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 {
// N's
a: (x: number) => 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;
}
}
//// [callSignatureAssignabilityInInheritance.js]
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