Does Typescript make javascript safe? Not so sure about that...

gistfile1.ts

// ...

    app.get(libRoot + '/get/:start/:count', function(req, res) {
        getSongsPage([/*some data*/], req.params.start, req.params.count);
// ...
    });

// ...

function getSongsPage(allSongs: SongInfo[], start: number, count: number): SongInfo[] {
    console.log("start=" + start);
    console.log("count=" + count);
    console.log("start + count=" + (start + count));
    console.log("typeof start=" + typeof start);
    console.log("typeof count=" + typeof count);
    console.log("typeof (start + count)=" + typeof (start + count));
    var end: number = Math.min(allSongs.length, start + count);
    if (end > start) {
        return allSongs.slice(start, end);
    }
    return [];
}

See also some nice articles: "Why TypeScript Isn't the Answer" http://www.walkercoderanger.com/blog/2014/02/typescript-isnt-the-answer/ from serie of articles "The JavaScript Minefield"

this -> http://www.purescript.org/posts/FFI/