//// [constructSignatureAssignabilityInInheritance3.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: new (x: number) => string[];
a7: new (x: (arg: Base) => Derived) => (r: Base) => Derived2;
a8: new (x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived;
a10: new (...x: Base[]) => Base;
a11: new (x: { foo: string }, y: { foo: string; bar: string }) => Base;
a12: new (x: Array, y: Array) => Array;
a14: {
new (x: number): number[];
new (x: string): string[];
};
a15: new (x: { a: string; b: number }) => number;
a16: {
// type of parameter is overload set which means we can't do inference based on this type
new (x: {
new (a: number): number;
new (a?: number): number;
}): number[];
new (x: {
new (a: boolean): boolean;
new (a?: boolean): boolean;
}): boolean[];
};
}
interface I extends A {
a2: new (x: T) => U[]; // error, contextual signature instantiation doesn't relate return types so U is {}, not a subtype of string[]
}
interface I2 extends A {
a2: new (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: new (x: (arg: T) => U) => (r: T) => V;
}
interface I4 extends A {
a8: new (x: (arg: T) => U, y: (arg2: { foo: number; }) => U) => (r: T) => U; // error, type mismatch
}
interface I4B extends A {
a10: new (...x: T[]) => T; // valid, parameter covariance works even after contextual signature instantiation
}
interface I4C extends A {
a11: new (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: new >(x: Array, y: Array) => T; // valid, no inferences for T, defaults to Array
}
interface I6 extends A {
a15: new (x: { a: T; b: T }) => T; // error, T is {} which isn't an acceptable return type
}
interface I7 extends A {
a15: new (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: new (x: new (a: T) => T) => T[];
}
}
module WithGenericSignaturesInBaseType {
// base type has generic call signature
interface B {
a2: new (x: T) => T[];
}
interface I6 extends B {
a2: new (x: T) => string[]; // error
}
// base type has generic call signature
interface C {
a2: new (x: T) => string[];
}
interface I7 extends C {
a2: new (x: T) => T[]; // error
}
// base type has a generic call signature with overloads
interface D {
a14: {
new (x: T): number[];
new (x: U): number[];
};
}
interface I8 extends D {
a14: new (x: T) => number[];
}
}
}
//// [constructSignatureAssignabilityInInheritance3.js]
// checking subtype relations for function types as it relates to contextual signature instantiation
// error cases
var __extends = 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 = {}));