When to use @Inject()?

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When creating services, I simply inject them to a controller as follows:

constructor(private myService: MyService) {}

While reading the section of custom providers it mentions that I should use @Inject() when I want to inject a provider.

I am confused. When to use @Inject() and when it is not needed? Thanks

[adrien2p]

Basically if the type of what you want to inject is a class then you can avoid to use @Inject, otherwise use it 😃

[bhaidar]

Oh great! Symbol reminds of InjectionToken.

Thanks @adrien2p a lot! I am paving my way through nestjs still.