File: freshLiteralInference.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 (54 lines) | stat: -rw-r--r-- 1,473 bytes parent folder | download | duplicates (2)
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
=== tests/cases/compiler/freshLiteralInference.ts ===
declare function f1<T extends "1" | "2" | "3">(x: T): T;
>f1 : <T extends "1" | "2" | "3">(x: T) => T
>x : T

const value = f1("1");  // regular "1"
>value : "1"
>f1("1") : "1"
>f1 : <T extends "1" | "2" | "3">(x: T) => T
>"1" : "1"

let x1 = value;  // regular "1"
>x1 : "1"
>value : "1"

declare function f2<T extends "1" | "2" | "3">(x: { value: T }): { value: T };
>f2 : <T extends "1" | "2" | "3">(x: {    value: T;}) => {    value: T;}
>x : { value: T; }
>value : T
>value : T

const obj2 = f2({ value: "1" });  // { value: regular "1" }
>obj2 : { value: "1"; }
>f2({ value: "1" }) : { value: "1"; }
>f2 : <T extends "1" | "2" | "3">(x: { value: T; }) => { value: T; }
>{ value: "1" } : { value: "1"; }
>value : "1"
>"1" : "1"

let x2 = obj2.value;  // regular "1"
>x2 : "1"
>obj2.value : "1"
>obj2 : { value: "1"; }
>value : "1"

declare function f3<T extends { value: "1" | "2" | "3" }>(obj: T): T;
>f3 : <T extends { value: "1" | "2" | "3"; }>(obj: T) => T
>value : "1" | "2" | "3"
>obj : T

const obj3 = f3({ value: "1" });  // before: { value: fresh "1" }
>obj3 : { value: "1"; }
>f3({ value: "1" }) : { value: "1"; }
>f3 : <T extends { value: "1" | "2" | "3"; }>(obj: T) => T
>{ value: "1" } : { value: "1"; }
>value : "1"
>"1" : "1"

let x3 = obj3.value;  // before: string, after: "1"
>x3 : "1"
>obj3.value : "1"
>obj3 : { value: "1"; }
>value : "1"