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