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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
=== tests/cases/conformance/types/typeRelationships/typeInference/unionAndIntersectionInference3.ts ===
// Repro from #30720
type Maybe<T> = T | undefined;
>Maybe : Maybe<T>
declare function concatMaybe<T>(...args: (Maybe<T> | Maybe<T>[])[]): T[];
>concatMaybe : <T>(...args: (Maybe<T> | Maybe<T>[])[]) => T[]
>args : (Maybe<T> | Maybe<T>[])[]
concatMaybe([1, 2, 3], 4);
>concatMaybe([1, 2, 3], 4) : number[]
>concatMaybe : <T>(...args: (Maybe<T> | Maybe<T>[])[]) => T[]
>[1, 2, 3] : number[]
>1 : 1
>2 : 2
>3 : 3
>4 : 4
// Repros from #32247
const g: <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Promise<U> = async <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>): Promise<U> => {
>g : <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Promise<U>
>com : () => Iterator<S, U, R> | AsyncIterator<S, U, R>
>async <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>): Promise<U> => { throw com;} : <U, R, S>(com: () => Iterator<S, U, R> | AsyncIterator<S, U, R>) => Promise<U>
>com : () => Iterator<S, U, R> | AsyncIterator<S, U, R>
throw com;
>com : () => Iterator<S, U, R> | AsyncIterator<S, U, R>
};
interface Foo1<T> {
test(value: T): void;
>test : (value: T) => void
>value : T
}
interface Bar1<T> {
test(value: T | PromiseLike<T>): void;
>test : (value: T | PromiseLike<T>) => void
>value : T | PromiseLike<T>
}
declare let f1: <T>(x: Foo1<T> | Bar1<T>) => Promise<T>;
>f1 : <T>(x: Foo1<T> | Bar1<T>) => Promise<T>
>x : Foo1<T> | Bar1<T>
declare let f2: <U>(x: Foo1<U> | Bar1<U>) => Promise<U>;
>f2 : <U>(x: Foo1<U> | Bar1<U>) => Promise<U>
>x : Foo1<U> | Bar1<U>
f1 = f2;
>f1 = f2 : <U>(x: Foo1<U> | Bar1<U>) => Promise<U>
>f1 : <T>(x: Foo1<T> | Bar1<T>) => Promise<T>
>f2 : <U>(x: Foo1<U> | Bar1<U>) => Promise<U>
f2 = f1;
>f2 = f1 : <T>(x: Foo1<T> | Bar1<T>) => Promise<T>
>f2 : <U>(x: Foo1<U> | Bar1<U>) => Promise<U>
>f1 : <T>(x: Foo1<T> | Bar1<T>) => Promise<T>
type Foo2<T> = {
>Foo2 : Foo2<T>
test(value: T): void;
>test : (value: T) => void
>value : T
}
type Bar2<T> = {
>Bar2 : Bar2<T>
test(value: T | PromiseLike<T>): void;
>test : (value: T | PromiseLike<T>) => void
>value : T | PromiseLike<T>
}
declare let g1: <T>(x: Foo2<T> | Bar2<T>) => Promise<T>;
>g1 : <T>(x: Foo2<T> | Bar2<T>) => Promise<T>
>x : Foo2<T> | Bar2<T>
declare let g2: <U>(x: Foo2<U> | Bar2<U>) => Promise<U>;
>g2 : <U>(x: Foo2<U> | Bar2<U>) => Promise<U>
>x : Foo2<U> | Bar2<U>
g1 = g2;
>g1 = g2 : <U>(x: Foo2<U> | Bar2<U>) => Promise<U>
>g1 : <T>(x: Foo2<T> | Bar2<T>) => Promise<T>
>g2 : <U>(x: Foo2<U> | Bar2<U>) => Promise<U>
g2 = g1;
>g2 = g1 : <T>(x: Foo2<T> | Bar2<T>) => Promise<T>
>g2 : <U>(x: Foo2<U> | Bar2<U>) => Promise<U>
>g1 : <T>(x: Foo2<T> | Bar2<T>) => Promise<T>
// Repro from #32572
declare function foo1<T>(obj: string[] & Iterable<T>): T;
>foo1 : <T>(obj: string[] & Iterable<T>) => T
>obj : string[] & Iterable<T>
declare function foo2<T>(obj: string[] & T): T;
>foo2 : <T>(obj: string[] & T) => T
>obj : string[] & T
declare let sa: string[];
>sa : string[]
declare let sx: string[] & { extra: number };
>sx : string[] & { extra: number; }
>extra : number
let x1 = foo1(sa); // string
>x1 : string
>foo1(sa) : string
>foo1 : <T>(obj: string[] & Iterable<T>) => T
>sa : string[]
let y1 = foo1(sx); // string
>y1 : string
>foo1(sx) : string
>foo1 : <T>(obj: string[] & Iterable<T>) => T
>sx : string[] & { extra: number; }
let x2 = foo2(sa); // unknown
>x2 : unknown
>foo2(sa) : unknown
>foo2 : <T>(obj: string[] & T) => T
>sa : string[]
let y2 = foo2(sx); // { extra: number }
>y2 : { extra: number; }
>foo2(sx) : { extra: number; }
>foo2 : <T>(obj: string[] & T) => T
>sx : string[] & { extra: number; }
// Repro from #33490
declare class Component<P> { props: P }
>Component : Component<P>
>props : P
export type ComponentClass<P> = new (props: P) => Component<P>;
>ComponentClass : ComponentClass<P>
>props : P
export type FunctionComponent<P> = (props: P) => null;
>FunctionComponent : FunctionComponent<P>
>props : P
>null : null
export type ComponentType<P> = FunctionComponent<P> | ComponentClass<P>;
>ComponentType : ComponentType<P>
export interface RouteComponentProps { route: string }
>route : string
declare function withRouter<
>withRouter : <P extends RouteComponentProps, C extends ComponentType<P>>(component: C & ComponentType<P>) => ComponentClass<Omit<P, keyof RouteComponentProps>>
P extends RouteComponentProps,
C extends ComponentType<P>
>(
component: C & ComponentType<P>
>component : C & ComponentType<P>
): ComponentClass<Omit<P, keyof RouteComponentProps>>;
interface Props extends RouteComponentProps { username: string }
>username : string
declare const MyComponent: ComponentType<Props>;
>MyComponent : ComponentType<Props>
withRouter(MyComponent);
>withRouter(MyComponent) : ComponentClass<Omit<Props, "route">>
>withRouter : <P extends RouteComponentProps, C extends ComponentType<P>>(component: C & ComponentType<P>) => ComponentClass<Omit<P, "route">>
>MyComponent : ComponentType<Props>
// Repro from #33490
type AB<T> = { a: T } | { b: T };
>AB : AB<T>
>a : T
>b : T
// T & AB<U> normalizes to T & { a: U } | T & { b: U } below
declare function foo<T, U>(obj: T & AB<U>): [T, U];
>foo : <T, U>(obj: T & AB<U>) => [T, U]
>obj : T & AB<U>
declare let ab: AB<string>;
>ab : AB<string>
let z = foo(ab); // [AB<string>, string]
>z : [{ a: string; } | { b: string; }, string]
>foo(ab) : [{ a: string; } | { b: string; }, string]
>foo : <T, U>(obj: T & AB<U>) => [T, U]
>ab : AB<string>
// Repro from #51399
declare let a: <T>() => (T extends true ? true : false) & boolean;
>a : <T>() => (T extends true ? true : false) & boolean
>true : true
>true : true
>false : false
declare let b: <T>() => (T extends true ? true : false) & boolean;
>b : <T>() => (T extends true ? true : false) & boolean
>true : true
>true : true
>false : false
a = b;
>a = b : <T>() => (T extends true ? true : false) & boolean
>a : <T>() => (T extends true ? true : false) & boolean
>b : <T>() => (T extends true ? true : false) & boolean
|
