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
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
|
//// [mappedTypeErrors.ts]
interface Shape {
name: string;
width: number;
height: number;
visible: boolean;
}
interface Named {
name: string;
}
interface Point {
x: number;
y: number;
}
// Constraint checking
type T00 = { [P in P]: string }; // Error
type T01 = { [P in number]: string }; // Error
type T02 = { [P in Date]: number }; // Error
type T03 = Record<Date, number>; // Error
type T10 = Pick<Shape, "name">;
type T11 = Pick<Shape, "foo">; // Error
type T12 = Pick<Shape, "name" | "foo">; // Error
type T13 = Pick<Shape, keyof Named>;
type T14 = Pick<Shape, keyof Point>; // Error
type T15 = Pick<Shape, never>;
type T16 = Pick<Shape, undefined>; // Error
function f1<T>(x: T) {
let y: Pick<Shape, T>; // Error
}
function f2<T extends string | number>(x: T) {
let y: Pick<Shape, T>; // Error
}
function f3<T extends keyof Shape>(x: T) {
let y: Pick<Shape, T>;
}
function f4<T extends keyof Named>(x: T) {
let y: Pick<Shape, T>;
}
// Type identity checking
function f10<T>() {
type K = keyof T;
var x: { [P in keyof T]: T[P] };
var x: { [Q in keyof T]: T[Q] };
var x: { [R in K]: T[R] };
}
function f11<T>() {
var x: { [P in keyof T]: T[P] };
var x: { [P in keyof T]?: T[P] }; // Error
var x: { readonly [P in keyof T]: T[P] }; // Error
var x: { readonly [P in keyof T]?: T[P] }; // Error
}
function f12<T>() {
var x: { [P in keyof T]: T[P] };
var x: { [P in keyof T]: T[P][] }; // Error
}
// Check that inferences to mapped types are secondary
declare function objAndReadonly<T>(primary: T, secondary: Readonly<T>): T;
declare function objAndPartial<T>(primary: T, secondary: Partial<T>): T;
function f20() {
let x1 = objAndReadonly({ x: 0, y: 0 }, { x: 1 }); // Error
let x2 = objAndReadonly({ x: 0, y: 0 }, { x: 1, y: 1 });
let x3 = objAndReadonly({ x: 0, y: 0 }, { x: 1, y: 1, z: 1 }); // Error
}
function f21() {
let x1 = objAndPartial({ x: 0, y: 0 }, { x: 1 });
let x2 = objAndPartial({ x: 0, y: 0 }, { x: 1, y: 1 });
let x3 = objAndPartial({ x: 0, y: 0 }, { x: 1, y: 1, z: 1 }); // Error
}
// Verify use of Pick<T, K> for setState functions (#12793)
interface Foo {
a: string;
b?: number;
}
function setState<T, K extends keyof T>(obj: T, props: Pick<T, K>) {
for (let k in props) {
obj[k] = props[k];
}
}
let foo: Foo = { a: "hello", b: 42 };
setState(foo, { a: "test", b: 43 })
setState(foo, { a: "hi" });
setState(foo, { b: undefined });
setState(foo, { });
setState(foo, foo);
setState(foo, { a: undefined }); // Error
setState(foo, { c: true }); // Error
class C<T> {
state: T;
setState<K extends keyof T>(props: Pick<T, K>) {
for (let k in props) {
this.state[k] = props[k];
}
}
}
let c = new C<Foo>();
c.setState({ a: "test", b: 43 });
c.setState({ a: "hi" });
c.setState({ b: undefined });
c.setState({ });
c.setState(foo);
c.setState({ a: undefined }); // Error
c.setState({ c: true }); // Error
type T2 = { a?: number, [key: string]: any };
let x1: T2 = { a: 'no' }; // Error
let x2: Partial<T2> = { a: 'no' }; // Error
let x3: { [P in keyof T2]: T2[P]} = { a: 'no' }; // Error
// Repro from #13044
type Foo2<T, F extends keyof T> = {
pf: {[P in F]?: T[P]},
pt: {[P in T]?: T[P]}, // note: should be in keyof T
};
type O = {x: number, y: boolean};
let o: O = {x: 5, y: false};
let f: Foo2<O, 'x'> = {
pf: {x: 7},
pt: {x: 7, y: false},
};
//// [mappedTypeErrors.js]
function f1(x) {
var y; // Error
}
function f2(x) {
var y; // Error
}
function f3(x) {
var y;
}
function f4(x) {
var y;
}
// Type identity checking
function f10() {
var x;
var x;
var x;
}
function f11() {
var x;
var x; // Error
var x; // Error
var x; // Error
}
function f12() {
var x;
var x; // Error
}
function f20() {
var x1 = objAndReadonly({ x: 0, y: 0 }, { x: 1 }); // Error
var x2 = objAndReadonly({ x: 0, y: 0 }, { x: 1, y: 1 });
var x3 = objAndReadonly({ x: 0, y: 0 }, { x: 1, y: 1, z: 1 }); // Error
}
function f21() {
var x1 = objAndPartial({ x: 0, y: 0 }, { x: 1 });
var x2 = objAndPartial({ x: 0, y: 0 }, { x: 1, y: 1 });
var x3 = objAndPartial({ x: 0, y: 0 }, { x: 1, y: 1, z: 1 }); // Error
}
function setState(obj, props) {
for (var k in props) {
obj[k] = props[k];
}
}
var foo = { a: "hello", b: 42 };
setState(foo, { a: "test", b: 43 });
setState(foo, { a: "hi" });
setState(foo, { b: undefined });
setState(foo, {});
setState(foo, foo);
setState(foo, { a: undefined }); // Error
setState(foo, { c: true }); // Error
var C = (function () {
function C() {
}
C.prototype.setState = function (props) {
for (var k in props) {
this.state[k] = props[k];
}
};
return C;
}());
var c = new C();
c.setState({ a: "test", b: 43 });
c.setState({ a: "hi" });
c.setState({ b: undefined });
c.setState({});
c.setState(foo);
c.setState({ a: undefined }); // Error
c.setState({ c: true }); // Error
var x1 = { a: 'no' }; // Error
var x2 = { a: 'no' }; // Error
var x3 = { a: 'no' }; // Error
var o = { x: 5, y: false };
var f = {
pf: { x: 7 },
pt: { x: 7, y: false }
};
//// [mappedTypeErrors.d.ts]
interface Shape {
name: string;
width: number;
height: number;
visible: boolean;
}
interface Named {
name: string;
}
interface Point {
x: number;
y: number;
}
declare type T00 = {
[P in P]: string;
};
declare type T01 = {
[P in number]: string;
};
declare type T02 = {
[P in Date]: number;
};
declare type T03 = Record<Date, number>;
declare type T10 = Pick<Shape, "name">;
declare type T11 = Pick<Shape, "foo">;
declare type T12 = Pick<Shape, "name" | "foo">;
declare type T13 = Pick<Shape, keyof Named>;
declare type T14 = Pick<Shape, keyof Point>;
declare type T15 = Pick<Shape, never>;
declare type T16 = Pick<Shape, undefined>;
declare function f1<T>(x: T): void;
declare function f2<T extends string | number>(x: T): void;
declare function f3<T extends keyof Shape>(x: T): void;
declare function f4<T extends keyof Named>(x: T): void;
declare function f10<T>(): void;
declare function f11<T>(): void;
declare function f12<T>(): void;
declare function objAndReadonly<T>(primary: T, secondary: Readonly<T>): T;
declare function objAndPartial<T>(primary: T, secondary: Partial<T>): T;
declare function f20(): void;
declare function f21(): void;
interface Foo {
a: string;
b?: number;
}
declare function setState<T, K extends keyof T>(obj: T, props: Pick<T, K>): void;
declare let foo: Foo;
declare class C<T> {
state: T;
setState<K extends keyof T>(props: Pick<T, K>): void;
}
declare let c: C<Foo>;
declare type T2 = {
a?: number;
[key: string]: any;
};
declare let x1: T2;
declare let x2: Partial<T2>;
declare let x3: {
[P in keyof T2]: T2[P];
};
declare type Foo2<T, F extends keyof T> = {
pf: {
[P in F]?: T[P];
};
pt: {
[P in T]?: T[P];
};
};
declare type O = {
x: number;
y: boolean;
};
declare let o: O;
declare let f: Foo2<O, 'x'>;
|
