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
|
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(47,1): error TS2322: Type '(x: number) => number[]' is not assignable to type '<T>(x: T) => T[]'.
Types of parameters 'x' and 'x' are incompatible.
Type 'T' is not assignable to type 'number'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(50,1): error TS2322: Type '(x: number) => string[]' is not assignable to type '<T>(x: T) => string[]'.
Types of parameters 'x' and 'x' are incompatible.
Type 'T' is not assignable to type 'number'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(53,1): error TS2322: Type '(x: number) => void' is not assignable to type '<T>(x: T) => T'.
Types of parameters 'x' and 'x' are incompatible.
Type 'T' is not assignable to type 'number'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(56,1): error TS2322: Type '(x: string, y: number) => string' is not assignable to type '<T, U>(x: T, y: U) => T'.
Types of parameters 'x' and 'x' are incompatible.
Type 'T' is not assignable to type 'string'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(59,1): error TS2322: Type '(x: (arg: string) => number) => string' is not assignable to type '<T, U>(x: (arg: T) => U) => T'.
Types of parameters 'x' and 'x' are incompatible.
Types of parameters 'arg' and 'arg' are incompatible.
Type 'string' is not assignable to type 'T'.
'T' could be instantiated with an arbitrary type which could be unrelated to 'string'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(62,1): error TS2322: Type '(x: (arg: Base) => Derived) => Base' is not assignable to type '<T extends Base, U extends Derived>(x: (arg: T) => U) => T'.
Types of parameters 'x' and 'x' are incompatible.
Types of parameters 'arg' and 'arg' are incompatible.
Type 'Base' is not assignable to type 'T'.
'Base' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Base'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(65,1): error TS2322: Type '(x: (arg: Base) => Derived) => (r: Base) => Derived' is not assignable to type '<T extends Base, U extends Derived>(x: (arg: T) => U) => (r: T) => U'.
Types of parameters 'x' and 'x' are incompatible.
Types of parameters 'arg' and 'arg' are incompatible.
Type 'Base' is not assignable to type 'T'.
'Base' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Base'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(68,1): error TS2322: Type '(x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived' is not assignable to type '<T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: T) => U) => (r: T) => U'.
Types of parameters 'x' and 'x' are incompatible.
Types of parameters 'arg' and 'arg' are incompatible.
Type 'Base' is not assignable to type 'T'.
'Base' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Base'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(71,1): error TS2322: Type '(x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived' is not assignable to type '<T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: { foo: string; bing: number; }) => U) => (r: T) => U'.
Types of parameters 'x' and 'x' are incompatible.
Types of parameters 'arg' and 'arg' are incompatible.
Type 'Base' is not assignable to type 'T'.
'Base' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Base'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(74,1): error TS2322: Type '(...x: Derived[]) => Derived' is not assignable to type '<T extends Derived>(...x: T[]) => T'.
Type 'Derived' is not assignable to type 'T'.
'Derived' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Derived'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(77,1): error TS2322: Type '(x: { foo: string; }, y: { foo: string; bar: string; }) => Base' is not assignable to type '<T extends Base>(x: T, y: T) => T'.
Types of parameters 'y' and 'y' are incompatible.
Type 'T' is not assignable to type '{ foo: string; bar: string; }'.
Property 'bar' is missing in type 'Base' but required in type '{ foo: string; bar: string; }'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(80,1): error TS2322: Type '(x: Base[], y: Derived2[]) => Derived[]' is not assignable to type '<T extends Base[]>(x: Base[], y: T) => Derived[]'.
Types of parameters 'y' and 'y' are incompatible.
Type 'T' is not assignable to type 'Derived2[]'.
Type 'Base[]' is not assignable to type 'Derived2[]'.
Type 'Base' is missing the following properties from type 'Derived2': baz, bar
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(83,1): error TS2322: Type '(x: Base[], y: Derived[]) => Derived[]' is not assignable to type '<T extends Derived[]>(x: Base[], y: T) => T'.
Type 'Derived[]' is not assignable to type 'T'.
'Derived[]' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Derived[]'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(85,1): error TS2322: Type '<T>(x: { a: T; b: T; }) => T' is not assignable to type '(x: { a: string; b: number; }) => Object'.
Types of parameters 'x' and 'x' are incompatible.
Type '{ a: string; b: number; }' is not assignable to type '{ a: string; b: string; }'.
Types of property 'b' are incompatible.
Type 'number' is not assignable to type 'string'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts(86,1): error TS2322: Type '(x: { a: string; b: number; }) => Object' is not assignable to type '<T>(x: { a: T; b: T; }) => T'.
Types of parameters 'x' and 'x' are incompatible.
Type '{ a: T; b: T; }' is not assignable to type '{ a: string; b: number; }'.
Types of property 'a' are incompatible.
Type 'T' is not assignable to type 'string'.
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts (15 errors) ====
// these are all permitted with the current rules, since we do not do contextual signature instantiation
class Base { foo: string; }
class Derived extends Base { bar: string; }
class Derived2 extends Derived { baz: string; }
class OtherDerived extends Base { bing: string; }
var a: (x: number) => number[];
var a2: (x: number) => string[];
var a3: (x: number) => void;
var a4: (x: string, y: number) => string;
var a5: (x: (arg: string) => number) => string;
var a6: (x: (arg: Base) => Derived) => Base;
var a7: (x: (arg: Base) => Derived) => (r: Base) => Derived;
var a8: (x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived;
var a9: (x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived;
var a10: (...x: Derived[]) => Derived;
var a11: (x: { foo: string }, y: { foo: string; bar: string }) => Base;
var a12: (x: Array<Base>, y: Array<Derived2>) => Array<Derived>;
var a13: (x: Array<Base>, y: Array<Derived>) => Array<Derived>;
var a14: (x: { a: string; b: number }) => Object;
var a15: {
(x: number): number[];
(x: string): string[];
}
var a16: {
<T extends Derived>(x: T): number[];
<U extends Base>(x: U): number[];
}
var a17: {
(x: (a: number) => number): number[];
(x: (a: string) => string): string[];
};
var a18: {
(x: {
(a: number): number;
(a: string): string;
}): any[];
(x: {
(a: boolean): boolean;
(a: Date): Date;
}): any[];
}
var b: <T>(x: T) => T[];
a = b; // ok
b = a; // ok
~
!!! error TS2322: Type '(x: number) => number[]' is not assignable to type '<T>(x: T) => T[]'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type 'number'.
!!! related TS2208 tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts:45:9: This type parameter might need an `extends number` constraint.
var b2: <T>(x: T) => string[];
a2 = b2; // ok
b2 = a2; // ok
~~
!!! error TS2322: Type '(x: number) => string[]' is not assignable to type '<T>(x: T) => string[]'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type 'number'.
!!! related TS2208 tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts:48:10: This type parameter might need an `extends number` constraint.
var b3: <T>(x: T) => T;
a3 = b3; // ok
b3 = a3; // ok
~~
!!! error TS2322: Type '(x: number) => void' is not assignable to type '<T>(x: T) => T'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type 'number'.
!!! related TS2208 tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts:51:10: This type parameter might need an `extends number` constraint.
var b4: <T, U>(x: T, y: U) => T;
a4 = b4; // ok
b4 = a4; // ok
~~
!!! error TS2322: Type '(x: string, y: number) => string' is not assignable to type '<T, U>(x: T, y: U) => T'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type 'string'.
!!! related TS2208 tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts:54:10: This type parameter might need an `extends string` constraint.
var b5: <T, U>(x: (arg: T) => U) => T;
a5 = b5; // ok
b5 = a5; // ok
~~
!!! error TS2322: Type '(x: (arg: string) => number) => string' is not assignable to type '<T, U>(x: (arg: T) => U) => T'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Types of parameters 'arg' and 'arg' are incompatible.
!!! error TS2322: Type 'string' is not assignable to type 'T'.
!!! error TS2322: 'T' could be instantiated with an arbitrary type which could be unrelated to 'string'.
var b6: <T extends Base, U extends Derived>(x: (arg: T) => U) => T;
a6 = b6; // ok
b6 = a6; // ok
~~
!!! error TS2322: Type '(x: (arg: Base) => Derived) => Base' is not assignable to type '<T extends Base, U extends Derived>(x: (arg: T) => U) => T'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Types of parameters 'arg' and 'arg' are incompatible.
!!! error TS2322: Type 'Base' is not assignable to type 'T'.
!!! error TS2322: 'Base' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Base'.
var b7: <T extends Base, U extends Derived>(x: (arg: T) => U) => (r: T) => U;
a7 = b7; // ok
b7 = a7; // ok
~~
!!! error TS2322: Type '(x: (arg: Base) => Derived) => (r: Base) => Derived' is not assignable to type '<T extends Base, U extends Derived>(x: (arg: T) => U) => (r: T) => U'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Types of parameters 'arg' and 'arg' are incompatible.
!!! error TS2322: Type 'Base' is not assignable to type 'T'.
!!! error TS2322: 'Base' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Base'.
var b8: <T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: T) => U) => (r: T) => U;
a8 = b8; // ok
b8 = a8; // ok
~~
!!! error TS2322: Type '(x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived' is not assignable to type '<T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: T) => U) => (r: T) => U'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Types of parameters 'arg' and 'arg' are incompatible.
!!! error TS2322: Type 'Base' is not assignable to type 'T'.
!!! error TS2322: 'Base' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Base'.
var b9: <T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: { foo: string; bing: number }) => U) => (r: T) => U;
a9 = b9; // ok
b9 = a9; // ok
~~
!!! error TS2322: Type '(x: (arg: Base) => Derived, y: (arg2: Base) => Derived) => (r: Base) => Derived' is not assignable to type '<T extends Base, U extends Derived>(x: (arg: T) => U, y: (arg2: { foo: string; bing: number; }) => U) => (r: T) => U'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Types of parameters 'arg' and 'arg' are incompatible.
!!! error TS2322: Type 'Base' is not assignable to type 'T'.
!!! error TS2322: 'Base' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Base'.
var b10: <T extends Derived>(...x: T[]) => T;
a10 = b10; // ok
b10 = a10; // ok
~~~
!!! error TS2322: Type '(...x: Derived[]) => Derived' is not assignable to type '<T extends Derived>(...x: T[]) => T'.
!!! error TS2322: Type 'Derived' is not assignable to type 'T'.
!!! error TS2322: 'Derived' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Derived'.
var b11: <T extends Base>(x: T, y: T) => T;
a11 = b11; // ok
b11 = a11; // ok
~~~
!!! error TS2322: Type '(x: { foo: string; }, y: { foo: string; bar: string; }) => Base' is not assignable to type '<T extends Base>(x: T, y: T) => T'.
!!! error TS2322: Types of parameters 'y' and 'y' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type '{ foo: string; bar: string; }'.
!!! error TS2322: Property 'bar' is missing in type 'Base' but required in type '{ foo: string; bar: string; }'.
!!! related TS2728 tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts:18:49: 'bar' is declared here.
var b12: <T extends Array<Base>>(x: Array<Base>, y: T) => Array<Derived>;
a12 = b12; // ok
b12 = a12; // ok
~~~
!!! error TS2322: Type '(x: Base[], y: Derived2[]) => Derived[]' is not assignable to type '<T extends Base[]>(x: Base[], y: T) => Derived[]'.
!!! error TS2322: Types of parameters 'y' and 'y' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type 'Derived2[]'.
!!! error TS2322: Type 'Base[]' is not assignable to type 'Derived2[]'.
!!! error TS2322: Type 'Base' is missing the following properties from type 'Derived2': baz, bar
var b13: <T extends Array<Derived>>(x: Array<Base>, y: T) => T;
a13 = b13; // ok
b13 = a13; // ok
~~~
!!! error TS2322: Type '(x: Base[], y: Derived[]) => Derived[]' is not assignable to type '<T extends Derived[]>(x: Base[], y: T) => T'.
!!! error TS2322: Type 'Derived[]' is not assignable to type 'T'.
!!! error TS2322: 'Derived[]' is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint 'Derived[]'.
var b14: <T>(x: { a: T; b: T }) => T;
a14 = b14; // ok
~~~
!!! error TS2322: Type '<T>(x: { a: T; b: T; }) => T' is not assignable to type '(x: { a: string; b: number; }) => Object'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Type '{ a: string; b: number; }' is not assignable to type '{ a: string; b: string; }'.
!!! error TS2322: Types of property 'b' are incompatible.
!!! error TS2322: Type 'number' is not assignable to type 'string'.
b14 = a14; // ok
~~~
!!! error TS2322: Type '(x: { a: string; b: number; }) => Object' is not assignable to type '<T>(x: { a: T; b: T; }) => T'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Type '{ a: T; b: T; }' is not assignable to type '{ a: string; b: number; }'.
!!! error TS2322: Types of property 'a' are incompatible.
!!! error TS2322: Type 'T' is not assignable to type 'string'.
!!! related TS2208 tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignatures3.ts:84:11: This type parameter might need an `extends string` constraint.
var b15: <T>(x: T) => T[];
a15 = b15; // ok
b15 = a15; // ok
var b16: <T extends Base>(x: T) => number[];
a16 = b16; // ok
b16 = a16; // ok
var b17: <T>(x: (a: T) => T) => T[]; // ok
a17 = b17; // ok
b17 = a17; // ok
var b18: <T>(x: (a: T) => T) => T[];
a18 = b18; // ok
b18 = a18; // ok
|
