68 lines
2.2 KiB
TypeScript
68 lines
2.2 KiB
TypeScript
//// [chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.ts]
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class Chain<T extends A> {
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constructor(public value: T) { }
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then<S extends T>(cb: (x: T) => S): Chain<S> {
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return null;
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}
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}
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class A {
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x;
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}
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class B extends A {
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y;
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}
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class C extends B {
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z;
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}
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// Ok to go down the chain, but error to try to climb back up
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(new Chain(new A)).then(a => new B).then(b => new C).then(c => new B).then(b => new A);
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//// [chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js]
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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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 (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
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return extendStatics(d, b);
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};
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return function (d, b) {
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if (typeof b !== "function" && b !== null)
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throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
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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 Chain = /** @class */ (function () {
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function Chain(value) {
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this.value = value;
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}
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Chain.prototype.then = function (cb) {
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return null;
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};
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return Chain;
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}());
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var A = /** @class */ (function () {
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function A() {
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}
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return A;
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}());
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var B = /** @class */ (function (_super) {
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__extends(B, _super);
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function B() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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return B;
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}(A));
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var C = /** @class */ (function (_super) {
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__extends(C, _super);
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function C() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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return C;
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}(B));
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// Ok to go down the chain, but error to try to climb back up
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(new Chain(new A)).then(function (a) { return new B; }).then(function (b) { return new C; }).then(function (c) { return new B; }).then(function (b) { return new A; });
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