68 lines
2 KiB
TypeScript
68 lines
2 KiB
TypeScript
//// [derivedClassTransitivity.ts]
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// subclassing is not transitive when you can remove required parameters and add optional parameters
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class C {
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foo(x: number) { }
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}
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class D extends C {
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foo() { } // ok to drop parameters
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}
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class E extends D {
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foo(x?: string) { } // ok to add optional parameters
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}
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var c: C;
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var d: D;
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var e: E;
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c = e;
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var r = c.foo(1);
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var r2 = e.foo('');
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//// [derivedClassTransitivity.js]
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// subclassing is not transitive when you can remove required parameters and add optional parameters
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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 C = /** @class */ (function () {
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function C() {
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}
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C.prototype.foo = function (x) { };
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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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D.prototype.foo = function () { }; // ok to drop parameters
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return D;
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}(C));
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var E = /** @class */ (function (_super) {
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__extends(E, _super);
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function E() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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E.prototype.foo = function (x) { }; // ok to add optional parameters
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return E;
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}(D));
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var c;
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var d;
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var e;
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c = e;
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var r = c.foo(1);
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var r2 = e.foo('');
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