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
|
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithFunctionTypedArguments2.ts(29,10): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
Type argument candidate '1' is not a valid type argument because it is not a supertype of candidate 'string'.
tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithFunctionTypedArguments2.ts(40,10): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
Type argument candidate '1' is not a valid type argument because it is not a supertype of candidate 'string'.
==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithFunctionTypedArguments2.ts (2 errors) ====
// Generic functions used as arguments for function typed parameters are not used to make inferences from
// Using construct signature arguments, no errors expected
function foo<T>(x: new(a: T) => T) {
return new x(null);
}
interface I {
new <T>(x: T): T;
}
interface I2<T> {
new (x: T): T;
}
var i: I;
var i2: I2<string>;
var a: {
new <T>(x: T): T;
}
var r = foo(i); // any
var r2 = foo<string>(i); // string
var r3 = foo(i2); // string
var r3b = foo(a); // any
function foo2<T, U>(x: T, cb: new(a: T) => U) {
return new cb(x);
}
var r4 = foo2(1, i2); // error
~~~~
!!! error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
!!! error TS2453: Type argument candidate '1' is not a valid type argument because it is not a supertype of candidate 'string'.
var r4b = foo2(1, a); // any
var r5 = foo2(1, i); // any
var r6 = foo2<string, string>('', i2); // string
function foo3<T, U>(x: T, cb: new(a: T) => U, y: U) {
return new cb(x);
}
var r7 = foo3(null, i, ''); // any
var r7b = foo3(null, a, ''); // any
var r8 = foo3(1, i2, 1); // error
~~~~
!!! error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
!!! error TS2453: Type argument candidate '1' is not a valid type argument because it is not a supertype of candidate 'string'.
var r9 = foo3<string, string>('', i2, ''); // string
|
