gistfile1.txt

var async = require('asyncawait/async'),
    await = require('asyncawait/await'),
    fs = require('fs');

function read(path) {
    return function(done) {
        fs.readFile(path, 'utf8', done);
    }
}

Function.prototype.await = function() {
    return await(this);
};

var fn = async.cps(function() {
    return read(__filename).await().length;
    //return await(read(__filename)).length;
});

fn(function(err, res) {
    err && console.log(err);

    console.log(res);
});