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
|
=== tests/cases/compiler/narrowedConstInMethod.ts ===
function f() {
>f : () => { bar(): number; } | undefined
const x: string | null = <any>{};
>x : string | null
>null : null
><any>{} : any
>{} : {}
if (x !== null) {
>x !== null : boolean
>x : string | null
>null : null
return {
>{ bar() { return x.length; } // Error: possibly null x } : { bar(): number; }
bar() { return x.length; } // Error: possibly null x
>bar : () => number
>x.length : number
>x : string
>length : number
};
}
}
function f2() {
>f2 : () => typeof (Anonymous class) | undefined
const x: string | null = <any>{};
>x : string | null
>null : null
><any>{} : any
>{} : {}
if (x !== null) {
>x !== null : boolean
>x : string | null
>null : null
return class {
>class { bar() { return x.length; } // Error: possibly null x } : typeof (Anonymous class)
bar() { return x.length; } // Error: possibly null x
>bar : () => number
>x.length : number
>x : string
>length : number
};
}
}
|
