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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
//// [instantiateContextualTypes.ts]
// #6611
export interface A<a> {
value: a;
}
function fn<a>(values: A<a>, value: a) : void {
}
declare let handlers: A<(value: number) => void>;
fn(handlers, value => alert(value));
// #21382
interface BaseProps<T> {
initialValues: T;
nextValues: (cur: T) => T;
}
declare class Component<P> { constructor(props: P); props: P; }
declare class GenericComponent<Props = {}, Values = object>
extends Component<Props & BaseProps<Values>> {
iv: Values;
}
new GenericComponent({ initialValues: 12, nextValues: val => 12 });
// #22149
declare function useStringOrNumber<T extends string | number>(t: T, useIt: T extends string ? ((s: string) => void) : ((n: number) => void)): void;
useStringOrNumber("", foo => {});
// #25299
type ActionType<P> = string & { attachPayloadTypeHack?: P & never }
type Handler<S, P> = P extends void
? (state: S) => S
: (state: S, payload: P) => S
interface ActionHandler<S, P> {
actionType: ActionType<P>
handler: Handler<S, P>
}
declare function handler<S, P>(actionType: ActionType<P>, handler: Handler<S, P>): ActionHandler<S, P>
declare function createReducer<S>(
defaultState: S,
...actionHandlers: ActionHandler<S, any>[]
): any
interface AppState {
dummy: string
}
const defaultState: AppState = {
dummy: ''
}
const NON_VOID_ACTION: ActionType<number> = 'NON_VOID_ACTION'
, VOID_ACTION: ActionType<void> = 'VOID_ACTION'
createReducer(
defaultState,
handler(NON_VOID_ACTION, (state, _payload) => state),
handler(VOID_ACTION, state => state)
)
// #25814
type R = {
a: (x: number) => void;
b: (x: string) => void;
};
type O = {
on<P extends keyof R>(x: P, callback: R[P]): void;
};
declare var x: O;
x.on('a', a => {});
// #29775
namespace N1 {
declare class Component<P> {
constructor(props: P);
}
interface ComponentClass<P = {}> {
new (props: P): Component<P>;
}
type CreateElementChildren<P> =
P extends { children?: infer C }
? C extends any[]
? C
: C[]
: unknown;
declare function createElement<P extends {}>(
type: ComponentClass<P>,
...children: CreateElementChildren<P>
): any;
declare function createElement2<P extends {}>(
type: ComponentClass<P>,
child: CreateElementChildren<P>
): any;
class InferFunctionTypes extends Component<{children: (foo: number) => string}> {}
createElement(InferFunctionTypes, (foo) => "" + foo);
createElement2(InferFunctionTypes, [(foo) => "" + foo]);
}
// #30341
type InnerBox<T> = {
value: T;
}
type OuterBox<T> = {
inner: InnerBox<T>
};
type BoxConsumerFromOuterBox<T> =
T extends OuterBox<infer U> ?
(box: InnerBox<U>) => void :
never;
declare function passContentsToFunc<T>(outerBox: T, consumer: BoxConsumerFromOuterBox<T>): void;
declare const outerBoxOfString: OuterBox<string>;
passContentsToFunc(outerBoxOfString, box => box.value);
// Repro from #32349
type DooDad = 'SOMETHING' | 'ELSE' ;
class Interesting {
public compiles = () : Promise<DooDad> => {
return Promise.resolve().then(() => {
if (1 < 2) {
return 'SOMETHING';
}
return 'ELSE';
});
};
public doesnt = () : Promise<DooDad> => {
return Promise.resolve().then(() => {
return 'ELSE';
});
};
public slightlyDifferentErrorMessage = () : Promise<DooDad> => {
return Promise.resolve().then(() => {
if (1 < 2) {
return 'SOMETHING';
}
return 'SOMETHING';
});
};
}
// Repro from #32349
declare function invoke<T>(f: () => T): T;
let xx: 0 | 1 | 2 = invoke(() => 1);
// Repro from #32416
declare function assignPartial<T>(target: T, partial: Partial<T>): T;
let obj = {
foo(bar: string) {}
}
assignPartial(obj, { foo(...args) {} }); // args has type [string]
//// [instantiateContextualTypes.js]
// #6611
function fn(values, value) {
}
fn(handlers, value => alert(value));
new GenericComponent({ initialValues: 12, nextValues: val => 12 });
useStringOrNumber("", foo => { });
const defaultState = {
dummy: ''
};
const NON_VOID_ACTION = 'NON_VOID_ACTION', VOID_ACTION = 'VOID_ACTION';
createReducer(defaultState, handler(NON_VOID_ACTION, (state, _payload) => state), handler(VOID_ACTION, state => state));
x.on('a', a => { });
// #29775
var N1;
(function (N1) {
class InferFunctionTypes extends Component {
}
createElement(InferFunctionTypes, (foo) => "" + foo);
createElement2(InferFunctionTypes, [(foo) => "" + foo]);
})(N1 || (N1 = {}));
passContentsToFunc(outerBoxOfString, box => box.value);
class Interesting {
constructor() {
this.compiles = () => {
return Promise.resolve().then(() => {
if (1 < 2) {
return 'SOMETHING';
}
return 'ELSE';
});
};
this.doesnt = () => {
return Promise.resolve().then(() => {
return 'ELSE';
});
};
this.slightlyDifferentErrorMessage = () => {
return Promise.resolve().then(() => {
if (1 < 2) {
return 'SOMETHING';
}
return 'SOMETHING';
});
};
}
}
let xx = invoke(() => 1);
let obj = {
foo(bar) { }
};
assignPartial(obj, { foo(...args) { } }); // args has type [string]
export {};
|
