File: narrowExceptionVariableInCatchClause.types

package info (click to toggle)
node-typescript 5.0.4%2Bds1-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 459,140 kB
  • sloc: javascript: 1,972,754; makefile: 6; sh: 1
file content (57 lines) | stat: -rw-r--r-- 1,374 bytes parent folder | download | duplicates (4)
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
=== tests/cases/conformance/types/any/narrowExceptionVariableInCatchClause.ts ===
declare function isFooError(x: any): x is { type: 'foo'; dontPanic(); };
>isFooError : (x: any) => x is { type: 'foo'; dontPanic(): any; }
>x : any
>type : "foo"
>dontPanic : () => any

function tryCatch() {
>tryCatch : () => void

    try {
        // do stuff...
    }
    catch (err) { // err is implicitly 'any' and cannot be annotated
>err : any

        if (isFooError(err)) {
>isFooError(err) : boolean
>isFooError : (x: any) => x is { type: "foo"; dontPanic(): any; }
>err : any

            err.dontPanic(); // OK
>err.dontPanic() : any
>err.dontPanic : () => any
>err : { type: "foo"; dontPanic(): any; }
>dontPanic : () => any

            err.doPanic(); // ERROR: Property 'doPanic' does not exist on type '{...}'
>err.doPanic() : any
>err.doPanic : any
>err : { type: "foo"; dontPanic(): any; }
>doPanic : any
        }

        else if (err instanceof Error) {
>err instanceof Error : boolean
>err : any
>Error : ErrorConstructor

            err.message;
>err.message : string
>err : Error
>message : string

            err.massage; // ERROR: Property 'massage' does not exist on type 'Error'
>err.massage : any
>err : Error
>massage : any
        }

        else {
            throw err;
>err : any
        }
    }
}