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TypeScript - module内でexportを付ける/付けない場合を比較

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【結論】
・module内でexportをつけると、出力されるJSではオブジェクトのプロパティに追加されて外部からの利用が可能。
・exportをつけないと内部利用のみ(プロパティーに追加されない)

【コード】

Typescript
module X {
    //外部へ公開
    export function func_exported(){
        alert("test");
        func_inner();
    }

    //内部利用
    function func_inner(){
        alert("inner test");
    }
}

X.func_exported();
Javascript
var X;
(function (X) {
    //外部へ公開
    function func_exported() {
        alert("test");
        func_inner();
    }
    X.func_exported = func_exported;//ここでプロパティに追加している!!!!

    //内部利用
    //Typescriptでexportをつけていないfunc_innerはプロパティ追加コードが無い
    function func_inner() {
        alert("inner test");
    }
})(X || (X = {}));

X.func_exported();
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