1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
=== tests/cases/conformance/types/typeRelationships/bestCommonType/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 };
>a : { x: number; y?: number; }
>x : number
>y : number
var b: { x: number; z?: number };
>b : { x: number; z?: number; }
>x : number
>z : number
class Base { foo: string; }
>Base : Base
>foo : string
class Derived extends Base { bar: string; }
>Derived : Derived
>Base : Base
>bar : string
class Derived2 extends Base { baz: string; }
>Derived2 : Derived2
>Base : Base
>baz : string
var base: Base;
>base : Base
>Base : Base
var derived: Derived;
>derived : Derived
>Derived : Derived
var derived2: Derived2;
>derived2 : Derived2
>Derived2 : Derived2
var r = true ? 1 : 2;
>r : number
>true ? 1 : 2 : 1 | 2
>true : true
>1 : 1
>2 : 2
var r3 = true ? 1 : {};
>r3 : {}
>true ? 1 : {} : {}
>true : true
>1 : 1
>{} : {}
var r4 = true ? a : b; // typeof a
>r4 : { x: number; y?: number; } | { x: number; z?: number; }
>true ? a : b : { x: number; y?: number; } | { x: number; z?: number; }
>true : true
>a : { x: number; y?: number; }
>b : { x: number; z?: number; }
var r5 = true ? b : a; // typeof b
>r5 : { x: number; y?: number; } | { x: number; z?: number; }
>true ? b : a : { x: number; y?: number; } | { x: number; z?: number; }
>true : true
>b : { x: number; z?: number; }
>a : { x: number; y?: number; }
var r6 = true ? (x: number) => { } : (x: Object) => { }; // returns number => void
>r6 : (x: number) => void
>true ? (x: number) => { } : (x: Object) => { } : (x: number) => void
>true : true
>(x: number) => { } : (x: number) => void
>x : number
>(x: Object) => { } : (x: Object) => void
>x : Object
>Object : Object
var r7: (x: Object) => void = true ? (x: number) => { } : (x: Object) => { };
>r7 : (x: Object) => void
>x : Object
>Object : Object
>true ? (x: number) => { } : (x: Object) => { } : (x: number) => void
>true : true
>(x: number) => { } : (x: number) => void
>x : number
>(x: Object) => { } : (x: Object) => void
>x : Object
>Object : Object
var r8 = true ? (x: Object) => { } : (x: number) => { }; // returns Object => void
>r8 : (x: Object) => void
>true ? (x: Object) => { } : (x: number) => { } : (x: Object) => void
>true : true
>(x: Object) => { } : (x: Object) => void
>x : Object
>Object : Object
>(x: number) => { } : (x: number) => void
>x : number
var r10: Base = true ? derived : derived2; // no error since we use the contextual type in BCT
>r10 : Base
>Base : Base
>true ? derived : derived2 : Derived | Derived2
>true : true
>derived : Derived
>derived2 : Derived2
var r11 = true ? base : derived2;
>r11 : Base
>true ? base : derived2 : Base
>true : true
>base : Base
>derived2 : Derived2
function foo5<T, U>(t: T, u: U): Object {
>foo5 : <T, U>(t: T, u: U) => Object
>T : T
>U : U
>t : T
>T : T
>u : U
>U : U
>Object : Object
return true ? t : u; // BCT is Object
>true ? t : u : T | U
>true : true
>t : T
>u : U
}
|
