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
|
//// [typeArgumentsWithStringLiteralTypes01.ts]
declare function randBool(): boolean;
declare function takeReturnString(str: string): string;
declare function takeReturnHello(str: "Hello"): "Hello";
declare function takeReturnHelloWorld(str: "Hello" | "World"): "Hello" | "World";
function fun1<T>(x: T, y: T) {
return randBool() ? x : y;
}
function fun2<T, U>(x: T, y: U) {
return randBool() ? x : y;
}
function fun3<T>(...args: T[]): T {
return args[+randBool()];
}
namespace n1 {
// The following should all come back as strings.
// They should be assignable to/from something of a type 'string'.
// They should not be assignable to either "Hello" or "World".
export let a = fun1("Hello", "World");
export let b = fun1("Hello", "Hello");
export let c = fun2("Hello", "World");
export let d = fun2("Hello", "Hello");
export let e = fun3("Hello", "Hello", "World", "Foo");
// Should be valid
a = takeReturnString(a);
b = takeReturnString(b);
c = takeReturnString(c);
d = takeReturnString(d);
e = takeReturnString(e);
// Passing these as arguments should cause an error.
a = takeReturnHello(a);
b = takeReturnHello(b);
c = takeReturnHello(c);
d = takeReturnHello(d);
e = takeReturnHello(e);
// Passing these as arguments should cause an error.
a = takeReturnHelloWorld(a);
b = takeReturnHelloWorld(b);
c = takeReturnHelloWorld(c);
d = takeReturnHelloWorld(d);
e = takeReturnHelloWorld(e);
}
namespace n2 {
// The following (regardless of errors) should come back typed
// as "Hello" (or "Hello" | "Hello").
export let a = fun1<"Hello">("Hello", "Hello");
export let b = fun1<"Hello">("Hello", "World");
export let c = fun2<"Hello", "Hello">("Hello", "Hello");
export let d = fun2<"Hello", "Hello">("Hello", "World");
export let e = fun3<"Hello">("Hello", "World");
// Assignment from the returned value should cause an error.
a = takeReturnString(a);
b = takeReturnString(b);
c = takeReturnString(c);
d = takeReturnString(d);
e = takeReturnString(e);
// Should be valid
a = takeReturnHello(a);
b = takeReturnHello(b);
c = takeReturnHello(c);
d = takeReturnHello(d);
e = takeReturnHello(e);
// Assignment from the returned value should cause an error.
a = takeReturnHelloWorld(a);
b = takeReturnHelloWorld(b);
c = takeReturnHelloWorld(c);
d = takeReturnHelloWorld(d);
e = takeReturnHelloWorld(e);
}
namespace n3 {
// The following (regardless of errors) should come back typed
// as "Hello" | "World" (or "World" | "Hello").
export let a = fun2<"Hello", "World">("Hello", "World");
export let b = fun2<"Hello", "World">("World", "Hello");
export let c = fun2<"World", "Hello">("Hello", "Hello");
export let d = fun2<"World", "Hello">("World", "World");
export let e = fun3<"Hello" | "World">("Hello", "World");
// Assignment from the returned value should cause an error.
a = takeReturnString(a);
b = takeReturnString(b);
c = takeReturnString(c);
d = takeReturnString(d);
e = takeReturnString(e);
// Passing these as arguments should cause an error.
a = takeReturnHello(a);
b = takeReturnHello(b);
c = takeReturnHello(c);
d = takeReturnHello(d);
e = takeReturnHello(e);
// Both should be valid.
a = takeReturnHelloWorld(a);
b = takeReturnHelloWorld(b);
c = takeReturnHelloWorld(c);
d = takeReturnHelloWorld(d);
e = takeReturnHelloWorld(e);
}
//// [typeArgumentsWithStringLiteralTypes01.js]
function fun1(x, y) {
return randBool() ? x : y;
}
function fun2(x, y) {
return randBool() ? x : y;
}
function fun3() {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
return args[+randBool()];
}
var n1;
(function (n1) {
// The following should all come back as strings.
// They should be assignable to/from something of a type 'string'.
// They should not be assignable to either "Hello" or "World".
n1.a = fun1("Hello", "World");
n1.b = fun1("Hello", "Hello");
n1.c = fun2("Hello", "World");
n1.d = fun2("Hello", "Hello");
n1.e = fun3("Hello", "Hello", "World", "Foo");
// Should be valid
n1.a = takeReturnString(n1.a);
n1.b = takeReturnString(n1.b);
n1.c = takeReturnString(n1.c);
n1.d = takeReturnString(n1.d);
n1.e = takeReturnString(n1.e);
// Passing these as arguments should cause an error.
n1.a = takeReturnHello(n1.a);
n1.b = takeReturnHello(n1.b);
n1.c = takeReturnHello(n1.c);
n1.d = takeReturnHello(n1.d);
n1.e = takeReturnHello(n1.e);
// Passing these as arguments should cause an error.
n1.a = takeReturnHelloWorld(n1.a);
n1.b = takeReturnHelloWorld(n1.b);
n1.c = takeReturnHelloWorld(n1.c);
n1.d = takeReturnHelloWorld(n1.d);
n1.e = takeReturnHelloWorld(n1.e);
})(n1 || (n1 = {}));
var n2;
(function (n2) {
// The following (regardless of errors) should come back typed
// as "Hello" (or "Hello" | "Hello").
n2.a = fun1("Hello", "Hello");
n2.b = fun1("Hello", "World");
n2.c = fun2("Hello", "Hello");
n2.d = fun2("Hello", "World");
n2.e = fun3("Hello", "World");
// Assignment from the returned value should cause an error.
n2.a = takeReturnString(n2.a);
n2.b = takeReturnString(n2.b);
n2.c = takeReturnString(n2.c);
n2.d = takeReturnString(n2.d);
n2.e = takeReturnString(n2.e);
// Should be valid
n2.a = takeReturnHello(n2.a);
n2.b = takeReturnHello(n2.b);
n2.c = takeReturnHello(n2.c);
n2.d = takeReturnHello(n2.d);
n2.e = takeReturnHello(n2.e);
// Assignment from the returned value should cause an error.
n2.a = takeReturnHelloWorld(n2.a);
n2.b = takeReturnHelloWorld(n2.b);
n2.c = takeReturnHelloWorld(n2.c);
n2.d = takeReturnHelloWorld(n2.d);
n2.e = takeReturnHelloWorld(n2.e);
})(n2 || (n2 = {}));
var n3;
(function (n3) {
// The following (regardless of errors) should come back typed
// as "Hello" | "World" (or "World" | "Hello").
n3.a = fun2("Hello", "World");
n3.b = fun2("World", "Hello");
n3.c = fun2("Hello", "Hello");
n3.d = fun2("World", "World");
n3.e = fun3("Hello", "World");
// Assignment from the returned value should cause an error.
n3.a = takeReturnString(n3.a);
n3.b = takeReturnString(n3.b);
n3.c = takeReturnString(n3.c);
n3.d = takeReturnString(n3.d);
n3.e = takeReturnString(n3.e);
// Passing these as arguments should cause an error.
n3.a = takeReturnHello(n3.a);
n3.b = takeReturnHello(n3.b);
n3.c = takeReturnHello(n3.c);
n3.d = takeReturnHello(n3.d);
n3.e = takeReturnHello(n3.e);
// Both should be valid.
n3.a = takeReturnHelloWorld(n3.a);
n3.b = takeReturnHelloWorld(n3.b);
n3.c = takeReturnHelloWorld(n3.c);
n3.d = takeReturnHelloWorld(n3.d);
n3.e = takeReturnHelloWorld(n3.e);
})(n3 || (n3 = {}));
//// [typeArgumentsWithStringLiteralTypes01.d.ts]
declare function randBool(): boolean;
declare function takeReturnString(str: string): string;
declare function takeReturnHello(str: "Hello"): "Hello";
declare function takeReturnHelloWorld(str: "Hello" | "World"): "Hello" | "World";
declare function fun1<T>(x: T, y: T): T;
declare function fun2<T, U>(x: T, y: U): T | U;
declare function fun3<T>(...args: T[]): T;
declare namespace n1 {
let a: string;
let b: string;
let c: string;
let d: string;
let e: string;
}
declare namespace n2 {
let a: "Hello";
let b: any;
let c: "Hello";
let d: any;
let e: any;
}
declare namespace n3 {
let a: "Hello" | "World";
let b: any;
let c: any;
let d: any;
let e: "Hello" | "World";
}
|
