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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
=== tests/cases/conformance/types/intersection/intersectionWithUnionConstraint.ts ===
function f1<T extends string | number, U extends string | number>(x: T & U) {
>f1 : Symbol(f1, Decl(intersectionWithUnionConstraint.ts, 0, 0))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 0, 12))
>U : Symbol(U, Decl(intersectionWithUnionConstraint.ts, 0, 38))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 0, 66))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 0, 12))
>U : Symbol(U, Decl(intersectionWithUnionConstraint.ts, 0, 38))
// Combined constraint of 'T & U' is 'string | number'
let y: string | number = x;
>y : Symbol(y, Decl(intersectionWithUnionConstraint.ts, 2, 7))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 0, 66))
}
function f2<T extends string | number | undefined, U extends string | null | undefined>(x: T & U) {
>f2 : Symbol(f2, Decl(intersectionWithUnionConstraint.ts, 3, 1))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 5, 12))
>U : Symbol(U, Decl(intersectionWithUnionConstraint.ts, 5, 50))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 5, 88))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 5, 12))
>U : Symbol(U, Decl(intersectionWithUnionConstraint.ts, 5, 50))
let y1: string | number = x; // Error
>y1 : Symbol(y1, Decl(intersectionWithUnionConstraint.ts, 6, 7))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 5, 88))
let y2: string | null = x; // Error
>y2 : Symbol(y2, Decl(intersectionWithUnionConstraint.ts, 7, 7))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 5, 88))
let y3: string | undefined = x;
>y3 : Symbol(y3, Decl(intersectionWithUnionConstraint.ts, 8, 7))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 5, 88))
let y4: number | null = x; // Error
>y4 : Symbol(y4, Decl(intersectionWithUnionConstraint.ts, 9, 7))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 5, 88))
let y5: number | undefined = x; // Error
>y5 : Symbol(y5, Decl(intersectionWithUnionConstraint.ts, 10, 7))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 5, 88))
let y6: null | undefined = x; // Error
>y6 : Symbol(y6, Decl(intersectionWithUnionConstraint.ts, 11, 7))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 5, 88))
}
type T1 = (string | number | undefined) & (string | null | undefined); // string | undefined
>T1 : Symbol(T1, Decl(intersectionWithUnionConstraint.ts, 12, 1))
function f3<T extends string | number | undefined>(x: T & (number | object | undefined)) {
>f3 : Symbol(f3, Decl(intersectionWithUnionConstraint.ts, 14, 70))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 16, 12))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 16, 51))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 16, 12))
const y: number | undefined = x;
>y : Symbol(y, Decl(intersectionWithUnionConstraint.ts, 17, 9))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 16, 51))
}
function f4<T extends string | number>(x: T & (number | object)) {
>f4 : Symbol(f4, Decl(intersectionWithUnionConstraint.ts, 18, 1))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 20, 12))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 20, 39))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 20, 12))
const y: number = x;
>y : Symbol(y, Decl(intersectionWithUnionConstraint.ts, 21, 9))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 20, 39))
}
function f5<T, U extends keyof T>(x: keyof T & U) {
>f5 : Symbol(f5, Decl(intersectionWithUnionConstraint.ts, 22, 1))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 24, 12))
>U : Symbol(U, Decl(intersectionWithUnionConstraint.ts, 24, 14))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 24, 12))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 24, 34))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 24, 12))
>U : Symbol(U, Decl(intersectionWithUnionConstraint.ts, 24, 14))
let y: keyof any = x;
>y : Symbol(y, Decl(intersectionWithUnionConstraint.ts, 25, 7))
>x : Symbol(x, Decl(intersectionWithUnionConstraint.ts, 24, 34))
}
// Repro from #23648
type Example<T, U> = { [K in keyof T]: K extends keyof U ? UnexpectedError<K> : NoErrorHere<K> }
>Example : Symbol(Example, Decl(intersectionWithUnionConstraint.ts, 26, 1))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 30, 13))
>U : Symbol(U, Decl(intersectionWithUnionConstraint.ts, 30, 15))
>K : Symbol(K, Decl(intersectionWithUnionConstraint.ts, 30, 24))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 30, 13))
>K : Symbol(K, Decl(intersectionWithUnionConstraint.ts, 30, 24))
>U : Symbol(U, Decl(intersectionWithUnionConstraint.ts, 30, 15))
>UnexpectedError : Symbol(UnexpectedError, Decl(intersectionWithUnionConstraint.ts, 30, 96))
>K : Symbol(K, Decl(intersectionWithUnionConstraint.ts, 30, 24))
>NoErrorHere : Symbol(NoErrorHere, Decl(intersectionWithUnionConstraint.ts, 32, 47))
>K : Symbol(K, Decl(intersectionWithUnionConstraint.ts, 30, 24))
type UnexpectedError<T extends PropertyKey> = T
>UnexpectedError : Symbol(UnexpectedError, Decl(intersectionWithUnionConstraint.ts, 30, 96))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 32, 21))
>PropertyKey : Symbol(PropertyKey, Decl(lib.es5.d.ts, --, --))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 32, 21))
type NoErrorHere<T extends PropertyKey> = T
>NoErrorHere : Symbol(NoErrorHere, Decl(intersectionWithUnionConstraint.ts, 32, 47))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 33, 17))
>PropertyKey : Symbol(PropertyKey, Decl(lib.es5.d.ts, --, --))
>T : Symbol(T, Decl(intersectionWithUnionConstraint.ts, 33, 17))
|
