Changed SongServer to use interface types. #18
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The implementation of
ISongServer
required explicitly defined types forcall
andcallback
parameters. This seems to be the case if you create a class implementing the interface. TypeScript cannot detect the correct parameter types, and so they have to be declared.Instead, if you directly implement the interface with an object, TypeScript will infer all of the function types. So now you don't have to declare any parameter types. Here I just returned it from a function for simplicity.