Haxe/JavaScript extern magic

Function.hx

abstract Function(Dynamic)
    from Action0 to Action0
    from Action1 to Action1
    from Action2 to Action2
    from Action3 to Action3
    from Action4 to Action4
    from Action5 to Action5
    from Action6 to Action6
    from Action7 to Action7
    from Action8 to Action8
    from Action9 to Action9
    from Action10 to Action10
    from Func1 to Func1
    from Func2 to Func2
    from Func3 to Func3
    from Func4 to Func4
    from Func5 to Func5
    from Func6 to Func6
    from Func7 to Func7
    from Func8 to Func8
    from Func9 to Func9
    from Func10 to Func10
{}

typedef Action0  = Void -> Void;
typedef Action1  = Dynamic -> Void;
typedef Action2  = Dynamic -> Dynamic -> Void;
typedef Action3  = Dynamic -> Dynamic -> Dynamic -> Void;
typedef Action4  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Void;
typedef Action5  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Void;
typedef Action6  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Void;
typedef Action7  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Void;
typedef Action8  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Void;
typedef Action9  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Void;
typedef Action10 = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Void;

typedef Func1  = Dynamic -> Dynamic;
typedef Func2  = Dynamic -> Dynamic -> Dynamic;
typedef Func3  = Dynamic -> Dynamic -> Dynamic -> Dynamic;
typedef Func4  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic;
typedef Func5  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic;
typedef Func6  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic;
typedef Func7  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic;
typedef Func8  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic;
typedef Func9  = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic;
typedef Func10 = Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic -> Dynamic;

Mixed.hx

abstract Mixed2<T1, T2>(Dynamic)
    from T1 to T1
    from T2 to T2 
{}

abstract Mixed3<T1, T2, T3>(Dynamic)
    from T1 to T1
    from T2 to T2 
    from T3 to T3 
{}

abstract Mixed4<T1, T2, T3, T4>(Dynamic)
    from T1 to T1
    from T2 to T2 
    from T3 to T3 
    from T4 to T4 
{}

abstract Mixed5<T1, T2, T3, T4, T5>(Dynamic)
    from T1 to T1
    from T2 to T2 
    from T3 to T3 
    from T4 to T4 
    from T5 to T5 
{}

ValueOrArray.hx

abstract ValueOrArray<T>(Dynamic) 
    from T to T
    from Array<T> to Array<T>
{}