Mastering TypeScript 3 - Third Edition

Enum resolution

As we have seen in previous chapters, magic strings are a prime example where we can refactor our code to use an enum resolution. As an example of this, let's consider a ServiceLocator class built around an enum resolution, as follows:

interface ISystemSettings { 
} 
 
interface IMailService { 
} 
 
enum Interfaces { 
    ISystemSettings, 
    IMailService 
} 
 
class ServiceLocatorTypes { 
    public static register( 
        interfaceName: Interfaces, instance: any) {} 
    public static resolve( 
        interfaceName: Interfaces) {} 
} 
 
ServiceLocatorTypes.register(Interfaces.ISystemSettings, {}); 
 
ServiceLocatorTypes.resolve(Interfaces.ISystemSettings); 

Here, we start with two interfaces that we wish to use with our service locator, named ISystemSettings and IMailService ...