Injection Not Working With Interfaces

Hi!

What am I doing wrong here?

interface LoggingProvider { 
    error();
}

@Service()
class DefaultLoggingProvider implements LoggingProvider {
    error() {
        // .. logging goes here
    }
}

@Service()
class UsersService {
    constructor(private logger: LogginProvider) { }
}

log is undefined in UsersService unless I name it. Can TypeDI do interface injection without named services or am I missing something here?

[Skona27]

But why? What is the purpose of this, that we must provide specific class in the constructor?

constructor(private logger: LogginProvider)

Isn’t it in conflict with whole idea behind DI pattern?

[NoNameProvided]

Hey @ldiego08!

As @Stradivario wrote, interfaces are compiled away and not part of the transformed code. You need to use classes. So you need to import the DefaultLoggingProvider

@Service()
class UsersService {
    constructor(private logger: DefaultLoggingProvider) { }
}