# Service Registration

# Default Service Construction

For the construction of the service decorator @Injectable

import { Injectable } from '@scandltd/vue-injector'

@Injectable
class LogService {}

# Dependency Injection

Dependencies could be injected not only into components, but into a service as well. To do so, you have to import dependencies by decorator Inject.

@Injectable
class UserService {
    @Inject(LogService) LogService;
    
    constructor () {
        this.LogService.log('Create User service');
    }
}

# Factory Provider

Sometimes you need to inject dependencies from a third-party library that is not designed to work with DI. In cases like this you can use a factory provider. This can be done by passing the factory into the useFactory property of the@ Injectable decorator.

class Logger { ... }

@Injectable({
    useFactory: () => new Logger()
})
class UserService {}

The useFactory property must be a function with a return value.

useFactory: () => {
    return new Logger()
}

# Value Provider

Sometimes it's easier to provide a ready-made object rather than ask the injector to create it from a class. To inject an object you have already created, configure the injector with the useValue option

const Logger = { ... }

@Injectable({
    useValue: Logger
})
class LoggerService {}

The useValue property can be of any type.