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
|
//// [intersectionNarrowing.ts]
// Repros from #43130
function f1<T>(x: T & string | T & undefined) {
if (x) {
x; // Should narrow to T & string
}
}
function f2<T>(x: T & string | T & undefined) {
if (x !== undefined) {
x; // Should narrow to T & string
}
else {
x; // Should narrow to T & undefined
}
}
function f3<T>(x: T & string | T & number) {
if (typeof x === "string") {
x; // Should narrow to T & string
}
else {
x; // Should narrow to T & number
}
}
function f4<T>(x: T & 1 | T & 2) {
switch (x) {
case 1: x; break; // T & 1
case 2: x; break; // T & 2
default: x; // Should narrow to never
}
}
function f5<T extends string | number>(x: T & number) {
const t1 = x === "hello"; // Should be an error
}
//// [intersectionNarrowing.js]
"use strict";
// Repros from #43130
function f1(x) {
if (x) {
x; // Should narrow to T & string
}
}
function f2(x) {
if (x !== undefined) {
x; // Should narrow to T & string
}
else {
x; // Should narrow to T & undefined
}
}
function f3(x) {
if (typeof x === "string") {
x; // Should narrow to T & string
}
else {
x; // Should narrow to T & number
}
}
function f4(x) {
switch (x) {
case 1:
x;
break; // T & 1
case 2:
x;
break; // T & 2
default: x; // Should narrow to never
}
}
function f5(x) {
var t1 = x === "hello"; // Should be an error
}
|
