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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
=== tests/cases/compiler/reachabilityChecks4.ts ===
function foo(x, y) {
>foo : (x: any, y: any) => 1 | 2 | 3
>x : any
>y : any
switch (x) {
>x : any
case 1:
>1 : 1
case 2:
>2 : 2
return 1;
>1 : 1
case 3:
>3 : 3
if (y) {
>y : any
return 2;
>2 : 2
}
case 4:
>4 : 4
return 3;
>3 : 3
}
}
declare function noop(): void;
>noop : () => void
declare function fail(): never;
>fail : () => never
function f1(x: 0 | 1 | 2) {
>f1 : (x: 0 | 1 | 2) => void
>x : 0 | 1 | 2
switch (x) {
>x : 0 | 1 | 2
case 0:
>0 : 0
fail();
>fail() : never
>fail : () => never
case 1:
>1 : 1
noop();
>noop() : void
>noop : () => void
case 2:
>2 : 2
return;
}
}
// Repro from #34021
type Behavior = 'SLIDE' | 'SLIDE_OUT'
>Behavior : "SLIDE" | "SLIDE_OUT"
type Direction = 'LEFT' | 'RIGHT' | 'TOP' | 'BOTTOM'
>Direction : "LEFT" | "RIGHT" | "TOP" | "BOTTOM"
interface Transition {
behavior: Behavior
>behavior : Behavior
direction: Direction
>direction : Direction
}
function f2(transition: Transition): any {
>f2 : (transition: Transition) => any
>transition : Transition
switch (transition.behavior) {
>transition.behavior : Behavior
>transition : Transition
>behavior : Behavior
case 'SLIDE':
>'SLIDE' : "SLIDE"
switch (transition.direction) {
>transition.direction : Direction
>transition : Transition
>direction : Direction
case 'LEFT':
>'LEFT' : "LEFT"
return []
>[] : undefined[]
case 'RIGHT':
>'RIGHT' : "RIGHT"
return []
>[] : undefined[]
case 'TOP':
>'TOP' : "TOP"
return []
>[] : undefined[]
case 'BOTTOM':
>'BOTTOM' : "BOTTOM"
return []
>[] : undefined[]
}
case 'SLIDE_OUT':
>'SLIDE_OUT' : "SLIDE_OUT"
switch (transition.direction) {
>transition.direction : Direction
>transition : Transition
>direction : Direction
case 'LEFT':
>'LEFT' : "LEFT"
return []
>[] : undefined[]
case 'RIGHT':
>'RIGHT' : "RIGHT"
return []
>[] : undefined[]
case 'TOP':
>'TOP' : "TOP"
return []
>[] : undefined[]
case 'BOTTOM':
>'BOTTOM' : "BOTTOM"
return []
>[] : undefined[]
}
}
}
|
