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
|
=== tests/cases/conformance/expressions/functions/arrowFunctionContexts.ts ===
// Arrow function used in with statement
with (window) {
>window : Window & typeof globalThis
var p = () => this;
>p : any
>() => this : any
>this : any
}
// Arrow function as argument to super call
class Base {
>Base : Base
constructor(n: any) { }
>n : any
}
class Derived extends Base {
>Derived : Derived
>Base : Base
constructor() {
super(() => this);
>super(() => this) : void
>super : typeof Base
>() => this : () => this
>this : this
}
}
// Arrow function as function argument
window.setTimeout(() => null, 100);
>window.setTimeout(() => null, 100) : number
>window.setTimeout : ((handler: TimerHandler, timeout?: number, ...arguments: any[]) => number) & ((handler: TimerHandler, timeout?: number, ...arguments: any[]) => number)
>window : Window & typeof globalThis
>setTimeout : ((handler: TimerHandler, timeout?: number, ...arguments: any[]) => number) & ((handler: TimerHandler, timeout?: number, ...arguments: any[]) => number)
>() => null : () => any
>null : null
>100 : 100
// Arrow function as value in array literal
var obj = (n: number) => '';
>obj : (n: number) => string
>(n: number) => '' : (n: number) => string
>n : number
>'' : ""
var obj: { (n: number): string; }; // OK
>obj : (n: number) => string
>n : number
var arr = [(n: number) => ''];
>arr : ((n: number) => string)[]
>[(n: number) => ''] : ((n: number) => string)[]
>(n: number) => '' : (n: number) => string
>n : number
>'' : ""
var arr: { (n: number): string; }[]; // Incorrect error here (bug 829597)
>arr : ((n: number) => string)[]
>n : number
// Arrow function as enum value
enum E {
>E : E
x = () => 4, // Error expected
>x : E
>() => 4 : () => number
>4 : 4
y = (() => this).length // error, can't use this in enum
>y : E
>(() => this).length : number
>(() => this) : () => any
>() => this : () => any
>this : any
>length : number
}
// Arrow function as module variable initializer
module M {
>M : typeof M
export var a = (s) => '';
>a : (s: any) => string
>(s) => '' : (s: any) => string
>s : any
>'' : ""
var b = (s) => s;
>b : (s: any) => any
>(s) => s : (s: any) => any
>s : any
>s : any
}
// Repeat above for module members that are functions? (necessary to redo all of them?)
module M2 {
>M2 : typeof M2
// Arrow function used in with statement
with (window) {
>window : Window & typeof globalThis
var p = () => this;
>p : any
>() => this : any
>this : any
}
// Arrow function as argument to super call
class Base {
>Base : Base
constructor(n: any) { }
>n : any
}
class Derived extends Base {
>Derived : Derived
>Base : Base
constructor() {
super(() => this);
>super(() => this) : void
>super : typeof Base
>() => this : () => this
>this : this
}
}
// Arrow function as function argument
window.setTimeout(() => null, 100);
>window.setTimeout(() => null, 100) : number
>window.setTimeout : ((handler: TimerHandler, timeout?: number, ...arguments: any[]) => number) & ((handler: TimerHandler, timeout?: number, ...arguments: any[]) => number)
>window : Window & typeof globalThis
>setTimeout : ((handler: TimerHandler, timeout?: number, ...arguments: any[]) => number) & ((handler: TimerHandler, timeout?: number, ...arguments: any[]) => number)
>() => null : () => any
>null : null
>100 : 100
// Arrow function as value in array literal
var obj = (n: number) => '';
>obj : (n: number) => string
>(n: number) => '' : (n: number) => string
>n : number
>'' : ""
var obj: { (n: number): string; }; // OK
>obj : (n: number) => string
>n : number
var arr = [(n: number) => ''];
>arr : ((n: number) => string)[]
>[(n: number) => ''] : ((n: number) => string)[]
>(n: number) => '' : (n: number) => string
>n : number
>'' : ""
var arr: { (n: number): string; }[]; // Incorrect error here (bug 829597)
>arr : ((n: number) => string)[]
>n : number
// Arrow function as enum value
enum E {
>E : E
x = () => 4, // Error expected
>x : E
>() => 4 : () => number
>4 : 4
y = (() => this).length
>y : E
>(() => this).length : number
>(() => this) : () => any
>() => this : () => any
>this : any
>length : number
}
// Arrow function as module variable initializer
module M {
>M : typeof M
export var a = (s) => '';
>a : (s: any) => string
>(s) => '' : (s: any) => string
>s : any
>'' : ""
var b = (s) => s;
>b : (s: any) => any
>(s) => s : (s: any) => any
>s : any
>s : any
}
}
// <Identifier>(ParamList) => { ... } is a generic arrow function
var generic1 = <T>(n: T) => [n];
>generic1 : <T>(n: T) => T[]
><T>(n: T) => [n] : <T>(n: T) => T[]
>n : T
>[n] : T[]
>n : T
var generic1: { <T>(n: T): T[] }; // Incorrect error, Bug 829597
>generic1 : <T>(n: T) => T[]
>n : T
var generic2 = <T>(n: T) => { return [n]; };
>generic2 : <T>(n: T) => T[]
><T>(n: T) => { return [n]; } : <T>(n: T) => T[]
>n : T
>[n] : T[]
>n : T
var generic2: { <T>(n: T): T[] };
>generic2 : <T>(n: T) => T[]
>n : T
// <Identifier> ((ParamList) => { ... } ) is a type assertion to an arrow function
var asserted1 = <any>((n) => [n]);
>asserted1 : any
><any>((n) => [n]) : any
>((n) => [n]) : (n: any) => any[]
>(n) => [n] : (n: any) => any[]
>n : any
>[n] : any[]
>n : any
var asserted1: any;
>asserted1 : any
var asserted2 = <any>((n) => { return n; });
>asserted2 : any
><any>((n) => { return n; }) : any
>((n) => { return n; }) : (n: any) => any
>(n) => { return n; } : (n: any) => any
>n : any
>n : any
var asserted2: any;
>asserted2 : any
|
