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
|
//// [controlFlowIfStatement.ts]
let x: string | number | boolean | RegExp;
let cond: boolean;
x = /a/;
if (x /* RegExp */, (x = true)) {
x; // boolean
x = "";
}
else {
x; // boolean
x = 42;
}
x; // string | number
function a() {
let x: string | number;
if (cond) {
x = 42;
}
else {
x = "";
return;
}
x; // number
}
function b() {
let x: string | number;
if (cond) {
x = 42;
throw "";
}
else {
x = "";
}
x; // string
}
function c<T>(data: string | T): T {
if (typeof data === 'string') {
return JSON.parse(data);
}
else {
return data;
}
}
function d<T extends string>(data: string | T): never {
if (typeof data === 'string') {
throw new Error('will always happen');
}
else {
return data;
}
}
//// [controlFlowIfStatement.js]
var x;
var cond;
x = /a/;
if (x /* RegExp */, (x = true)) {
x; // boolean
x = "";
}
else {
x; // boolean
x = 42;
}
x; // string | number
function a() {
var x;
if (cond) {
x = 42;
}
else {
x = "";
return;
}
x; // number
}
function b() {
var x;
if (cond) {
x = 42;
throw "";
}
else {
x = "";
}
x; // string
}
function c(data) {
if (typeof data === 'string') {
return JSON.parse(data);
}
else {
return data;
}
}
function d(data) {
if (typeof data === 'string') {
throw new Error('will always happen');
}
else {
return data;
}
}
|
