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
|
//// [typeGuardOfFormInstanceOfOnInterface.ts]
// A type guard of the form x instanceof C, where C is of a subtype of the global type 'Function'
// and C has a property named 'prototype'
// - when true, narrows the type of x to the type of the 'prototype' property in C provided
// it is a subtype of the type of x, or
// - when false, has no effect on the type of x.
interface C1 {
(): C1;
prototype: C1;
p1: string;
}
interface C2 {
(): C2;
prototype: C2;
p2: number;
}
interface D1 extends C1 {
prototype: D1;
p3: number;
}
var str: string;
var num: number;
var strOrNum: string | number;
var c1: C1;
var c2: C2;
var d1: D1;
var c1Orc2: C1 | C2;
str = c1Orc2 instanceof c1 && c1Orc2.p1; // C1
num = c1Orc2 instanceof c2 && c1Orc2.p2; // C2
str = c1Orc2 instanceof d1 && c1Orc2.p1; // C1
num = c1Orc2 instanceof d1 && c1Orc2.p3; // D1
var c2Ord1: C2 | D1;
num = c2Ord1 instanceof c2 && c2Ord1.p2; // C2
num = c2Ord1 instanceof d1 && c2Ord1.p3; // D1
str = c2Ord1 instanceof d1 && c2Ord1.p1; // D1
var r2: D1 | C2 = c2Ord1 instanceof c1 && c2Ord1; // C2 | D1
//// [typeGuardOfFormInstanceOfOnInterface.js]
// A type guard of the form x instanceof C, where C is of a subtype of the global type 'Function'
// and C has a property named 'prototype'
// - when true, narrows the type of x to the type of the 'prototype' property in C provided
// it is a subtype of the type of x, or
// - when false, has no effect on the type of x.
var str;
var num;
var strOrNum;
var c1;
var c2;
var d1;
var c1Orc2;
str = c1Orc2 instanceof c1 && c1Orc2.p1; // C1
num = c1Orc2 instanceof c2 && c1Orc2.p2; // C2
str = c1Orc2 instanceof d1 && c1Orc2.p1; // C1
num = c1Orc2 instanceof d1 && c1Orc2.p3; // D1
var c2Ord1;
num = c2Ord1 instanceof c2 && c2Ord1.p2; // C2
num = c2Ord1 instanceof d1 && c2Ord1.p3; // D1
str = c2Ord1 instanceof d1 && c2Ord1.p1; // D1
var r2 = c2Ord1 instanceof c1 && c2Ord1; // C2 | D1
|
