13 lines
408 B
TypeScript
13 lines
408 B
TypeScript
interface I1<T> {
|
|
func<U>(callback: (value: T) => U): I1<T>;
|
|
}
|
|
|
|
declare var v1: I1<number>;
|
|
|
|
var r1 = v1.func(num => num.toString())
|
|
.func(str => str.length) // error, number doesn't have a length
|
|
.func(num => num.toString())
|
|
|
|
var s1 = v1.func(num => num.toString())
|
|
var s2 = s1.func(str => str.length) // should also error
|
|
var s3 = s2.func(num => num.toString())
|