//// [bestCommonTypeOfConditionalExpressions.ts] // conditional expressions return the best common type of the branches plus contextual type (using the first candidate if multiple BCTs exist) // no errors expected here var a: { x: number; y?: number }; var b: { x: number; z?: number }; class Base { foo: string; } class Derived extends Base { bar: string; } class Derived2 extends Base { baz: string; } var base: Base; var derived: Derived; var derived2: Derived2; var r = true ? 1 : 2; var r3 = true ? 1 : {}; var r4 = true ? a : b; // typeof a var r5 = true ? b : a; // typeof b var r6 = true ? (x: number) => { } : (x: Object) => { }; // returns number => void var r7: (x: Object) => void = true ? (x: number) => { } : (x: Object) => { }; var r8 = true ? (x: Object) => { } : (x: number) => { }; // returns Object => void var r10: Base = true ? derived : derived2; // no error since we use the contextual type in BCT var r11 = true ? base : derived2; function foo5(t: T, u: U): Object { return true ? t : u; // BCT is Object } //// [bestCommonTypeOfConditionalExpressions.js] var __extends = this.__extends || function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; function __() { this.constructor = d; } __.prototype = b.prototype; d.prototype = new __(); }; // conditional expressions return the best common type of the branches plus contextual type (using the first candidate if multiple BCTs exist) // no errors expected here var a; var b; var Base = (function () { function Base() { } return Base; })(); var Derived = (function (_super) { __extends(Derived, _super); function Derived() { _super.apply(this, arguments); } return Derived; })(Base); var Derived2 = (function (_super) { __extends(Derived2, _super); function Derived2() { _super.apply(this, arguments); } return Derived2; })(Base); var base; var derived; var derived2; var r = true ? 1 : 2; var r3 = true ? 1 : {}; var r4 = true ? a : b; // typeof a var r5 = true ? b : a; // typeof b var r6 = true ? function (x) { } : function (x) { }; // returns number => void var r7 = true ? function (x) { } : function (x) { }; var r8 = true ? function (x) { } : function (x) { }; // returns Object => void var r10 = true ? derived : derived2; // no error since we use the contextual type in BCT var r11 = true ? base : derived2; function foo5(t, u) { return true ? t : u; }