78 lines
2.5 KiB
TypeScript
78 lines
2.5 KiB
TypeScript
//// [bestCommonTypeOfConditionalExpressions2.ts]
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// conditional expressions return the best common type of the branches plus contextual type (using the first candidate if multiple BCTs exist)
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// these are 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 Base { baz: string; }
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var base: Base;
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var derived: Derived;
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var derived2: Derived2;
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var r2 = true ? 1 : '';
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var r9 = true ? derived : derived2;
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function foo<T, U>(t: T, u: U) {
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return true ? t : u;
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}
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function foo2<T extends U, U>(t: T, u: U) { // Error for referencing own type parameter
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return true ? t : u; // Ok because BCT(T, U) = U
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}
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function foo3<T extends U, U extends V, V>(t: T, u: U) {
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return true ? t : u;
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}
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//// [bestCommonTypeOfConditionalExpressions2.js]
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// conditional expressions return the best common type of the branches plus contextual type (using the first candidate if multiple BCTs exist)
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// these are errors
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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 Base = /** @class */ (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 = /** @class */ (function (_super) {
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__extends(Derived, _super);
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function Derived() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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return Derived;
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}(Base));
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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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}(Base));
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var base;
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var derived;
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var derived2;
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var r2 = true ? 1 : '';
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var r9 = true ? derived : derived2;
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function foo(t, u) {
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return true ? t : u;
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}
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function foo2(t, u) {
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return true ? t : u; // Ok because BCT(T, U) = U
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}
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function foo3(t, u) {
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return true ? t : u;
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}
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