File: varianceAnnotationValidation.ts

package info (click to toggle)
node-typescript 4.9.5%2Bds1-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 533,908 kB
  • sloc: javascript: 2,018,330; makefile: 7; sh: 1
file content (30 lines) | stat: -rw-r--r-- 485 bytes parent folder | download | duplicates (3) 
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
 
// @strict: true
// @declaration: true

// Repro from #49607

// Variance annotation error expected

interface Controller<out T> {
	createAnimal: () => T;
	run: (animal: T) => void;
}

interface Animal {
	run(): void;
};

class Dog implements Animal {
	run() {};
	bark() {};
}

interface AnimalContainer<T> {
	controller: Controller<T>;
}

declare let ca: AnimalContainer<Animal>;
declare let cd: AnimalContainer<Dog>;

ca = cd;  // Ok
cd = ca;  // Error