index.js
function exists (path, callback) {
    Fs.stat(path, function (err) {
        callback(checkErr(err));
    });
}
function exists (path, callback) {
    Fs.stat(path, function (err) {
        callback(checkErr(err));
    });
}
function exists ( path , callback ) { Fs . stat ( path , function ( err ) { callback ( checkErr ( err ) ) ; } ) ; }
check if a given path exists
@method exists
@param {string} path
@param {function} callback
check if a given path exists