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
|
=== 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 : Symbol(a, Decl(bestCommonTypeOfConditionalExpressions.ts, 3, 3))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 3, 8))
>y : Symbol(y, Decl(bestCommonTypeOfConditionalExpressions.ts, 3, 19))
var b: { x: number; z?: number };
>b : Symbol(b, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 3))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 8))
>z : Symbol(z, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 19))
class Base { foo: string; }
>Base : Symbol(Base, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 33))
>foo : Symbol(Base.foo, Decl(bestCommonTypeOfConditionalExpressions.ts, 6, 12))
class Derived extends Base { bar: string; }
>Derived : Symbol(Derived, Decl(bestCommonTypeOfConditionalExpressions.ts, 6, 27))
>Base : Symbol(Base, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 33))
>bar : Symbol(Derived.bar, Decl(bestCommonTypeOfConditionalExpressions.ts, 7, 28))
class Derived2 extends Base { baz: string; }
>Derived2 : Symbol(Derived2, Decl(bestCommonTypeOfConditionalExpressions.ts, 7, 43))
>Base : Symbol(Base, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 33))
>baz : Symbol(Derived2.baz, Decl(bestCommonTypeOfConditionalExpressions.ts, 8, 29))
var base: Base;
>base : Symbol(base, Decl(bestCommonTypeOfConditionalExpressions.ts, 9, 3))
>Base : Symbol(Base, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 33))
var derived: Derived;
>derived : Symbol(derived, Decl(bestCommonTypeOfConditionalExpressions.ts, 10, 3))
>Derived : Symbol(Derived, Decl(bestCommonTypeOfConditionalExpressions.ts, 6, 27))
var derived2: Derived2;
>derived2 : Symbol(derived2, Decl(bestCommonTypeOfConditionalExpressions.ts, 11, 3))
>Derived2 : Symbol(Derived2, Decl(bestCommonTypeOfConditionalExpressions.ts, 7, 43))
var r = true ? 1 : 2;
>r : Symbol(r, Decl(bestCommonTypeOfConditionalExpressions.ts, 13, 3))
var r3 = true ? 1 : {};
>r3 : Symbol(r3, Decl(bestCommonTypeOfConditionalExpressions.ts, 14, 3))
var r4 = true ? a : b; // typeof a
>r4 : Symbol(r4, Decl(bestCommonTypeOfConditionalExpressions.ts, 15, 3))
>a : Symbol(a, Decl(bestCommonTypeOfConditionalExpressions.ts, 3, 3))
>b : Symbol(b, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 3))
var r5 = true ? b : a; // typeof b
>r5 : Symbol(r5, Decl(bestCommonTypeOfConditionalExpressions.ts, 16, 3))
>b : Symbol(b, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 3))
>a : Symbol(a, Decl(bestCommonTypeOfConditionalExpressions.ts, 3, 3))
var r6 = true ? (x: number) => { } : (x: Object) => { }; // returns number => void
>r6 : Symbol(r6, Decl(bestCommonTypeOfConditionalExpressions.ts, 17, 3))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 17, 17))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 17, 38))
>Object : Symbol(Object, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
var r7: (x: Object) => void = true ? (x: number) => { } : (x: Object) => { };
>r7 : Symbol(r7, Decl(bestCommonTypeOfConditionalExpressions.ts, 18, 3))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 18, 9))
>Object : Symbol(Object, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 18, 38))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 18, 59))
>Object : Symbol(Object, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
var r8 = true ? (x: Object) => { } : (x: number) => { }; // returns Object => void
>r8 : Symbol(r8, Decl(bestCommonTypeOfConditionalExpressions.ts, 19, 3))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 19, 17))
>Object : Symbol(Object, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
>x : Symbol(x, Decl(bestCommonTypeOfConditionalExpressions.ts, 19, 38))
var r10: Base = true ? derived : derived2; // no error since we use the contextual type in BCT
>r10 : Symbol(r10, Decl(bestCommonTypeOfConditionalExpressions.ts, 20, 3))
>Base : Symbol(Base, Decl(bestCommonTypeOfConditionalExpressions.ts, 4, 33))
>derived : Symbol(derived, Decl(bestCommonTypeOfConditionalExpressions.ts, 10, 3))
>derived2 : Symbol(derived2, Decl(bestCommonTypeOfConditionalExpressions.ts, 11, 3))
var r11 = true ? base : derived2;
>r11 : Symbol(r11, Decl(bestCommonTypeOfConditionalExpressions.ts, 21, 3))
>base : Symbol(base, Decl(bestCommonTypeOfConditionalExpressions.ts, 9, 3))
>derived2 : Symbol(derived2, Decl(bestCommonTypeOfConditionalExpressions.ts, 11, 3))
function foo5<T, U>(t: T, u: U): Object {
>foo5 : Symbol(foo5, Decl(bestCommonTypeOfConditionalExpressions.ts, 21, 33))
>T : Symbol(T, Decl(bestCommonTypeOfConditionalExpressions.ts, 23, 14))
>U : Symbol(U, Decl(bestCommonTypeOfConditionalExpressions.ts, 23, 16))
>t : Symbol(t, Decl(bestCommonTypeOfConditionalExpressions.ts, 23, 20))
>T : Symbol(T, Decl(bestCommonTypeOfConditionalExpressions.ts, 23, 14))
>u : Symbol(u, Decl(bestCommonTypeOfConditionalExpressions.ts, 23, 25))
>U : Symbol(U, Decl(bestCommonTypeOfConditionalExpressions.ts, 23, 16))
>Object : Symbol(Object, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
return true ? t : u; // BCT is Object
>t : Symbol(t, Decl(bestCommonTypeOfConditionalExpressions.ts, 23, 20))
>u : Symbol(u, Decl(bestCommonTypeOfConditionalExpressions.ts, 23, 25))
}
|
