153 lines
5.5 KiB
TypeScript
153 lines
5.5 KiB
TypeScript
//// [callSignatureAssignabilityInInheritance3.ts]
|
|
// checking subtype relations for function types as it relates to contextual signature instantiation
|
|
// error cases
|
|
|
|
module Errors {
|
|
class Base { foo: string; }
|
|
class Derived extends Base { bar: string; }
|
|
class Derived2 extends Derived { baz: string; }
|
|
class OtherDerived extends Base { bing: string; }
|
|
|
|
module WithNonGenericSignaturesInBaseType {
|
|
// base type with non-generic call signatures
|
|
interface A {
|
|
a2: (x: number) => string[];
|
|
a7: (x: (arg: Base) => Derived) => (r: Base) => Derived2;
|
|
a8: (x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived;
|
|
a10: (...x: Base[]) => Base;
|
|
a11: (x: { foo: string }, y: { foo: string; bar: string }) => Base;
|
|
a12: (x: Array<Base>, y: Array<Derived2>) => Array<Derived>;
|
|
a14: {
|
|
(x: number): number[];
|
|
(x: string): string[];
|
|
};
|
|
a15: (x: { a: string; b: number }) => number;
|
|
a16: {
|
|
// type of parameter is overload set which means we can't do inference based on this type
|
|
(x: {
|
|
(a: number): number;
|
|
(a?: number): number;
|
|
}): number[];
|
|
(x: {
|
|
(a: boolean): boolean;
|
|
(a?: boolean): boolean;
|
|
}): boolean[];
|
|
};
|
|
a17: {
|
|
(x: {
|
|
<T extends Derived>(a: T): T;
|
|
<T extends Base>(a: T): T;
|
|
}): any[];
|
|
(x: {
|
|
<T extends Derived2>(a: T): T;
|
|
<T extends Base>(a: T): T;
|
|
}): any[];
|
|
};
|
|
}
|
|
|
|
interface I extends A {
|
|
a2: <T, U>(x: T) => U[]; // error, contextual signature instantiation doesn't relate return types so U is {}, not a subtype of string[]
|
|
}
|
|
|
|
interface I2<T, U> extends A {
|
|
a2: (x: T) => U[]; // error, no contextual signature instantiation since I2.a2 is not generic
|
|
}
|
|
|
|
interface I3 extends A {
|
|
// valid, no inferences for V so it defaults to Derived2
|
|
a7: <T extends Base, U extends Derived, V extends Derived2>(x: (arg: T) => U) => (r: T) => V;
|
|
}
|
|
|
|
interface I4 extends A {
|
|
a8: <T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: { foo: number; }) => U) => (r: T) => U; // error, type mismatch
|
|
}
|
|
|
|
interface I4B extends A {
|
|
a10: <T extends Derived>(...x: T[]) => T; // valid, parameter covariance works even after contextual signature instantiation
|
|
}
|
|
|
|
interface I4C extends A {
|
|
a11: <T extends Derived>(x: T, y: T) => T; // valid, even though x is a Base, parameter covariance works even after contextual signature instantiation
|
|
}
|
|
|
|
interface I4E extends A {
|
|
a12: <T extends Array<Derived2>>(x: Array<Base>, y: Array<Base>) => T; // valid, no inferences for T, defaults to Array<Derived2>
|
|
}
|
|
|
|
interface I6 extends A {
|
|
a15: <T>(x: { a: T; b: T }) => T; // error, T is {} which isn't an acceptable return type
|
|
}
|
|
|
|
interface I7 extends A {
|
|
a15: <T extends Base>(x: { a: T; b: T }) => number; // error, T defaults to Base, which is not compatible with number or string
|
|
}
|
|
|
|
interface I8 extends A {
|
|
// ok, we relate each signature of a16 to b16, and within that, we make inferences from two different signatures in the respective A.a16 signature
|
|
a16: <T>(x: (a: T) => T) => T[];
|
|
}
|
|
|
|
interface I9 extends A {
|
|
a17: <T>(x: (a: T) => T) => any[]; // valid, target is more constrained than source, so it is safe in the traditional constraint-contravariant fashion
|
|
}
|
|
}
|
|
|
|
module WithGenericSignaturesInBaseType {
|
|
// base type has generic call signature
|
|
interface B {
|
|
a2: <T>(x: T) => T[];
|
|
}
|
|
|
|
interface I6 extends B {
|
|
a2: <T>(x: T) => string[]; // error
|
|
}
|
|
|
|
// base type has generic call signature
|
|
interface C {
|
|
a2: <T>(x: T) => string[];
|
|
}
|
|
|
|
interface I7 extends C {
|
|
a2: <T>(x: T) => T[]; // error
|
|
}
|
|
}
|
|
}
|
|
|
|
//// [callSignatureAssignabilityInInheritance3.js]
|
|
// checking subtype relations for function types as it relates to contextual signature instantiation
|
|
// error cases
|
|
var __extends = (this && this.__extends) || function (d, b) {
|
|
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
|
|
function __() { this.constructor = d; }
|
|
__.prototype = b.prototype;
|
|
d.prototype = new __();
|
|
};
|
|
var Errors;
|
|
(function (Errors) {
|
|
var Base = (function () {
|
|
function Base() {
|
|
}
|
|
return Base;
|
|
})();
|
|
var Derived = (function (_super) {
|
|
__extends(Derived, _super);
|
|
function Derived() {
|
|
_super.apply(this, arguments);
|
|
}
|
|
return Derived;
|
|
})(Base);
|
|
var Derived2 = (function (_super) {
|
|
__extends(Derived2, _super);
|
|
function Derived2() {
|
|
_super.apply(this, arguments);
|
|
}
|
|
return Derived2;
|
|
})(Derived);
|
|
var OtherDerived = (function (_super) {
|
|
__extends(OtherDerived, _super);
|
|
function OtherDerived() {
|
|
_super.apply(this, arguments);
|
|
}
|
|
return OtherDerived;
|
|
})(Base);
|
|
})(Errors || (Errors = {}));
|