105 lines
4.1 KiB
TypeScript
105 lines
4.1 KiB
TypeScript
//// [callSignatureAssignabilityInInheritance2.ts]
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// checking subtype relations for function types as it relates to contextual signature instantiation
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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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interface A { // T
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// M's
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a: (x: number) => number[];
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a2: (x: number) => string[];
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a3: (x: number) => void;
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a4: (x: string, y: number) => string;
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a5: (x: (arg: string) => number) => string;
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a6: (x: (arg: Base) => Derived) => Base;
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a7: (x: (arg: Base) => Derived) => (r: Base) => Derived;
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a8: (x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived;
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a9: (x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived;
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a10: (...x: Derived[]) => Derived;
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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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a13: (x: Array<Base>, y: Array<Derived>) => Array<Derived>;
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a14: (x: { a: string; b: number }) => Object;
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a15: {
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(x: number): number[];
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(x: string): string[];
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};
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a16: {
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<T extends Derived>(x: T): number[];
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<U extends Base>(x: U): number[];
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};
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a17: {
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(x: (a: number) => number): number[];
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(x: (a: string) => string): string[];
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};
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a18: {
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(x: {
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(a: number): number;
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(a: string): string;
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}): any[];
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(x: {
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(a: boolean): boolean;
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(a: Date): Date;
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}): any[];
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};
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}
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// S's
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interface I extends A {
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// N's
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a: <T>(x: T) => T[]; // ok, instantiation of N is a subtype of M, T is number
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a2: <T>(x: T) => string[]; // ok
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a3: <T>(x: T) => T; // ok since Base returns void
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a4: <T, U>(x: T, y: U) => T; // ok, instantiation of N is a subtype of M, T is string, U is number
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a5: <T, U>(x: (arg: T) => U) => T; // ok, U is in a parameter position so inferences can be made
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a6: <T extends Base, U extends Derived>(x: (arg: T) => U) => T; // ok, same as a5 but with object type hierarchy
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a7: <T extends Base, U extends Derived>(x: (arg: T) => U) => (r: T) => U; // ok
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a8: <T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: T) => U) => (r: T) => U; // ok
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a9: <T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: { foo: string; bing: number }) => U) => (r: T) => U; // ok, same as a8 with compatible object literal
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a10: <T extends Derived>(...x: T[]) => T; // ok
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a11: <T extends Base>(x: T, y: T) => T; // ok
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a12: <T extends Array<Base>>(x: Array<Base>, y: T) => Array<Derived>; // ok, less specific parameter type
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a13: <T extends Array<Derived>>(x: Array<Base>, y: T) => T; // ok, T = Array<Derived>, satisfies constraint, contextual signature instantiation succeeds
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a14: <T>(x: { a: T; b: T }) => T; // ok, best common type yields T = {} but that's satisfactory for this signature
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a15: <T>(x: T) => T[]; // ok
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a16: <T extends Base>(x: T) => number[]; // ok
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a17: <T>(x: (a: T) => T) => T[]; // ok
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a18: <T>(x: (a: T) => T) => T[]; // ok, no inferences for T but assignable to any
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}
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//// [callSignatureAssignabilityInInheritance2.js]
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// checking subtype relations for function types as it relates to contextual signature instantiation
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var __extends = (this && 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 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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