putSingleton: Register an instance globally

putLazy: Register and create the instance globally after first call

putFactory: Register and create the instance on every call

find: Return an instance based on Type

isRegistered: Check if the instance was registered

unRegister: Delete instance if is registered

reset: Delete all registered instances "Most used for tests"

//Get a global instance of injection
final injection = Injection();
//Create a method for register your instances
void initDependencies() {
injection.putLazy<int>(() => 0);
}
//Call where you want!
class Service {
final int counter = injection<int>();
}