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
|
//// [stringLiteralTypesTypePredicates01.ts]
type Kind = "A" | "B"
function kindIs(kind: Kind, is: "A"): kind is "A";
function kindIs(kind: Kind, is: "B"): kind is "B";
function kindIs(kind: Kind, is: Kind): boolean {
return kind === is;
}
var x: Kind = undefined;
if (kindIs(x, "A")) {
let a = x;
}
else {
let b = x;
}
if (!kindIs(x, "B")) {
let c = x;
}
else {
let d = x;
}
//// [stringLiteralTypesTypePredicates01.js]
function kindIs(kind, is) {
return kind === is;
}
var x = undefined;
if (kindIs(x, "A")) {
var a = x;
}
else {
var b = x;
}
if (!kindIs(x, "B")) {
var c = x;
}
else {
var d = x;
}
//// [stringLiteralTypesTypePredicates01.d.ts]
type Kind = "A" | "B";
declare function kindIs(kind: Kind, is: "A"): kind is "A";
declare function kindIs(kind: Kind, is: "B"): kind is "B";
declare var x: Kind;
|
