388 lines
12 KiB
TypeScript
388 lines
12 KiB
TypeScript
//// [thisTypeInFunctions.ts]
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// body checking
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class B {
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n: number;
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}
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class C {
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n: number;
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explicitThis(this: this, m: number): number {
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return this.n + m;
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}
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explicitC(this: C, m: number): number {
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return this.n + m;
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}
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explicitProperty(this: {n: number}, m: number): number {
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return this.n + m;
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}
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explicitVoid(this: void, m: number): number {
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return m + 1;
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}
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}
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class D extends C { }
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interface I {
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a: number;
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explicitVoid1(this: void): number;
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explicitVoid2(this: void): number;
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explicitStructural(this: {a: number}): number;
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explicitInterface(this: I): number;
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explicitThis(this: this): number;
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}
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function explicitStructural(this: { y: number }, x: number): number {
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return x + this.y;
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}
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function justThis(this: { y: number }): number {
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return this.y;
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}
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function implicitThis(n: number): number {
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return this.m + n + 12;
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}
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let impl: I = {
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a: 12,
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explicitVoid2: () => this.a, // ok, this: any because it refers to some outer object (window?)
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explicitVoid1() { return 12; },
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explicitStructural() {
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return this.a;
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},
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explicitInterface() {
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return this.a;
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},
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explicitThis() {
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return this.a;
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},
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}
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impl.explicitVoid1 = function () { return 12; };
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impl.explicitVoid2 = () => 12;
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impl.explicitStructural = function() { return this.a; };
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impl.explicitInterface = function() { return this.a; };
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impl.explicitStructural = () => 12;
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impl.explicitInterface = () => 12;
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impl.explicitThis = function () { return this.a; };
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// parameter checking
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let ok: {y: number, f: (this: { y: number }, x: number) => number} = { y: 12, f: explicitStructural };
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let implicitAnyOk: {notSpecified: number, f: (x: number) => number} = { notSpecified: 12, f: implicitThis };
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ok.f(13);
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implicitThis(12);
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implicitAnyOk.f(12);
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let c = new C();
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let d = new D();
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let ripped = c.explicitC;
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c.explicitC(12);
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c.explicitProperty(12);
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c.explicitThis(12);
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d.explicitC(12);
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d.explicitProperty(12);
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d.explicitThis(12);
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let reconstructed: {
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n: number,
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explicitThis(this: C, m: number): number, // note: this: this is not allowed in an object literal type.
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explicitC(this: C, m: number): number,
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explicitProperty: (this: {n : number}, m: number) => number,
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explicitVoid(this: void, m: number): number,
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} = {
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n: 12,
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explicitThis: c.explicitThis,
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explicitC: c.explicitC,
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explicitProperty: c.explicitProperty,
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explicitVoid: c.explicitVoid
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};
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reconstructed.explicitThis(10);
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reconstructed.explicitProperty(11);
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let explicitVoid = reconstructed.explicitVoid;
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explicitVoid(12);
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// assignment checking
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let unboundToSpecified: (this: { y: number }, x: number) => number = x => x + this.y; // ok, this:any
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let specifiedToSpecified: (this: {y: number}, x: number) => number = explicitStructural;
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let anyToSpecified: (this: { y: number }, x: number) => number = function(x: number): number { return x + 12; };
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let unspecifiedLambda: (x: number) => number = x => x + 12;
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let specifiedLambda: (this: void, x: number) => number = x => x + 12;
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let unspecifiedLambdaToSpecified: (this: {y: number}, x: number) => number = unspecifiedLambda;
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let specifiedLambdaToSpecified: (this: {y: number}, x: number) => number = specifiedLambda;
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let explicitCFunction: (this: C, m: number) => number;
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let explicitPropertyFunction: (this: {n: number}, m: number) => number;
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c.explicitC = explicitCFunction;
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c.explicitC = function(this: C, m: number) { return this.n + m };
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c.explicitProperty = explicitPropertyFunction;
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c.explicitProperty = function(this: {n: number}, m: number) { return this.n + m };
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c.explicitProperty = reconstructed.explicitProperty;
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// lambdas are assignable to anything
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c.explicitC = m => m;
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c.explicitThis = m => m;
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c.explicitProperty = m => m;
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// this inside lambdas refer to outer scope
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// the outer-scoped lambda at top-level is still just `any`
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c.explicitC = m => m + this.n;
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c.explicitThis = m => m + this.n;
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c.explicitProperty = m => m + this.n;
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//NOTE: this=C here, I guess?
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c.explicitThis = explicitCFunction;
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c.explicitThis = function(this: C, m: number) { return this.n + m };
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// this:any compatibility
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c.explicitC = function(m) { return this.n + m };
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c.explicitProperty = function(m) { return this.n + m };
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c.explicitThis = function(m) { return this.n + m };
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// this: contextual typing
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c.explicitThis = function(this, m) { return this.n + m };
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// this: superclass compatibility
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c.explicitC = function(this: B, m: number) { return this.n + m };
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// this:void compatibility
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c.explicitVoid = n => n;
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// class-based assignability
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class Base1 {
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x: number;
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public polymorphic(this: this): number { return this.x; }
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explicit(this: Base1): number { return this.x; }
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static explicitStatic(this: typeof Base1): number { return this.y; }
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static y: number;
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}
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class Derived1 extends Base1 {
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y: number
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}
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class Base2 {
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y: number
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polymorphic(this: this): number { return this.y; }
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explicit(this: Base1): number { return this.x; }
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}
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class Derived2 extends Base2 {
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x: number
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}
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let b1 = new Base1();
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let b2 = new Base2();
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let d1 = new Derived1();
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let d2 = new Derived2();
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d2.polymorphic = d1.polymorphic // ok, 'x' and 'y' in { x, y }
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d1.polymorphic = d2.polymorphic // ok, 'x' and 'y' in { x, y }
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// bivariance-allowed cases
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d1.polymorphic = b2.polymorphic // ok, 'y' in D: { x, y }
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d2.polymorphic = d1.explicit // ok, 'y' in { x, y }
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b1.polymorphic = d2.polymorphic // ok, 'x' and 'y' not in Base1: { x }
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b1.explicit = d2.polymorphic // ok, 'x' and 'y' not in Base1: { x }
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////// use this-type for construction with new ////
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function InterfaceThis(this: I) {
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this.a = 12;
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}
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function LiteralTypeThis(this: {x: string}) {
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this.x = "ok";
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}
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function AnyThis(this: any) {
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this.x = "ok";
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}
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let interfaceThis = new InterfaceThis();
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let literalTypeThis = new LiteralTypeThis();
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let anyThis = new AnyThis();
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//// type parameter inference ////
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declare var f: {
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(this: void, x: number): number,
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call<U>(this: (...argArray: any[]) => U, ...argArray: any[]): U;
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};
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let n: number = f.call(12);
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function missingTypeIsImplicitAny(this, a: number) { return this.anything + a; }
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//// [thisTypeInFunctions.js]
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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var _this = this;
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// body checking
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var B = /** @class */ (function () {
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function B() {
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}
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return B;
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}());
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var C = /** @class */ (function () {
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function C() {
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}
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C.prototype.explicitThis = function (m) {
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return this.n + m;
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};
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C.prototype.explicitC = function (m) {
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return this.n + m;
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};
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C.prototype.explicitProperty = function (m) {
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return this.n + m;
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};
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C.prototype.explicitVoid = function (m) {
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return m + 1;
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};
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return C;
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}());
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var D = /** @class */ (function (_super) {
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__extends(D, _super);
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function D() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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return D;
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}(C));
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function explicitStructural(x) {
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return x + this.y;
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}
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function justThis() {
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return this.y;
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}
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function implicitThis(n) {
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return this.m + n + 12;
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}
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var impl = {
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a: 12,
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explicitVoid2: function () { return _this.a; },
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explicitVoid1: function () { return 12; },
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explicitStructural: function () {
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return this.a;
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},
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explicitInterface: function () {
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return this.a;
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},
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explicitThis: function () {
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return this.a;
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}
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};
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impl.explicitVoid1 = function () { return 12; };
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impl.explicitVoid2 = function () { return 12; };
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impl.explicitStructural = function () { return this.a; };
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impl.explicitInterface = function () { return this.a; };
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impl.explicitStructural = function () { return 12; };
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impl.explicitInterface = function () { return 12; };
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impl.explicitThis = function () { return this.a; };
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// parameter checking
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var ok = { y: 12, f: explicitStructural };
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var implicitAnyOk = { notSpecified: 12, f: implicitThis };
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ok.f(13);
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implicitThis(12);
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implicitAnyOk.f(12);
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var c = new C();
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var d = new D();
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var ripped = c.explicitC;
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c.explicitC(12);
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c.explicitProperty(12);
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c.explicitThis(12);
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d.explicitC(12);
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d.explicitProperty(12);
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d.explicitThis(12);
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var reconstructed = {
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n: 12,
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explicitThis: c.explicitThis,
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explicitC: c.explicitC,
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explicitProperty: c.explicitProperty,
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explicitVoid: c.explicitVoid
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};
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reconstructed.explicitThis(10);
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reconstructed.explicitProperty(11);
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var explicitVoid = reconstructed.explicitVoid;
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explicitVoid(12);
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// assignment checking
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var unboundToSpecified = function (x) { return x + _this.y; }; // ok, this:any
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var specifiedToSpecified = explicitStructural;
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var anyToSpecified = function (x) { return x + 12; };
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var unspecifiedLambda = function (x) { return x + 12; };
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var specifiedLambda = function (x) { return x + 12; };
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var unspecifiedLambdaToSpecified = unspecifiedLambda;
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var specifiedLambdaToSpecified = specifiedLambda;
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var explicitCFunction;
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var explicitPropertyFunction;
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c.explicitC = explicitCFunction;
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c.explicitC = function (m) { return this.n + m; };
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c.explicitProperty = explicitPropertyFunction;
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c.explicitProperty = function (m) { return this.n + m; };
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c.explicitProperty = reconstructed.explicitProperty;
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// lambdas are assignable to anything
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c.explicitC = function (m) { return m; };
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c.explicitThis = function (m) { return m; };
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c.explicitProperty = function (m) { return m; };
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// this inside lambdas refer to outer scope
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// the outer-scoped lambda at top-level is still just `any`
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c.explicitC = function (m) { return m + _this.n; };
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c.explicitThis = function (m) { return m + _this.n; };
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c.explicitProperty = function (m) { return m + _this.n; };
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//NOTE: this=C here, I guess?
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c.explicitThis = explicitCFunction;
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c.explicitThis = function (m) { return this.n + m; };
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// this:any compatibility
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c.explicitC = function (m) { return this.n + m; };
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c.explicitProperty = function (m) { return this.n + m; };
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c.explicitThis = function (m) { return this.n + m; };
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// this: contextual typing
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c.explicitThis = function (m) { return this.n + m; };
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// this: superclass compatibility
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c.explicitC = function (m) { return this.n + m; };
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// this:void compatibility
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c.explicitVoid = function (n) { return n; };
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// class-based assignability
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var Base1 = /** @class */ (function () {
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function Base1() {
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}
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Base1.prototype.polymorphic = function () { return this.x; };
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Base1.prototype.explicit = function () { return this.x; };
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Base1.explicitStatic = function () { return this.y; };
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return Base1;
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}());
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var Derived1 = /** @class */ (function (_super) {
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__extends(Derived1, _super);
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function Derived1() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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return Derived1;
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}(Base1));
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var Base2 = /** @class */ (function () {
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function Base2() {
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}
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Base2.prototype.polymorphic = function () { return this.y; };
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Base2.prototype.explicit = function () { return this.x; };
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return Base2;
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}());
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var Derived2 = /** @class */ (function (_super) {
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__extends(Derived2, _super);
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function Derived2() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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return Derived2;
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}(Base2));
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var b1 = new Base1();
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var b2 = new Base2();
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var d1 = new Derived1();
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var d2 = new Derived2();
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d2.polymorphic = d1.polymorphic; // ok, 'x' and 'y' in { x, y }
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d1.polymorphic = d2.polymorphic; // ok, 'x' and 'y' in { x, y }
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// bivariance-allowed cases
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d1.polymorphic = b2.polymorphic; // ok, 'y' in D: { x, y }
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d2.polymorphic = d1.explicit; // ok, 'y' in { x, y }
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b1.polymorphic = d2.polymorphic; // ok, 'x' and 'y' not in Base1: { x }
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b1.explicit = d2.polymorphic; // ok, 'x' and 'y' not in Base1: { x }
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////// use this-type for construction with new ////
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function InterfaceThis() {
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this.a = 12;
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}
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function LiteralTypeThis() {
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this.x = "ok";
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}
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function AnyThis() {
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this.x = "ok";
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}
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var interfaceThis = new InterfaceThis();
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var literalTypeThis = new LiteralTypeThis();
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var anyThis = new AnyThis();
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var n = f.call(12);
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function missingTypeIsImplicitAny(a) { return this.anything + a; }
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