formatter.js

// This code assumes all files are in the /input folder.
// The formatted files will be in the /output folder
// Take care of these two things:
// 1) The code loads each file in memory before transforming it - be sure you've got enough RAM to run it
// 2) The code may break some code if it fails to format it

var INPUT_DIR = "input";
var OUTPUT_DIR = "output";

var fs = require("fs");
fs.readdir(INPUT_DIR, function (err, fileNames) {
    if (err) {
        console.log("There is no directory called " + INPUT_DIR);
        throw err;
    }

    fileNames.forEach(function (fileName, index) {
        var fullPath = INPUT_DIR + "/" + fileName;
        fs.readFile(fullPath, "utf-8", function (err, fileContents) {
            if (err) {
                console.log("There was a trouble reading file " + fullPath);
                throw err;
            }

            console.log("Processing file " + fullPath);

            // Remove many consecutive new lines and spaces
            fileContents = fileContents.replace(/(\r\n\s*)+/g, "\r\n");

            var outputPath = OUTPUT_DIR + "/" + fileName;
            fs.writeFile(outputPath, fileContents, function (err) {
                if (err) {
                    console.log("There was a trouble writing file " + fullPath);
                    throw err;
                }

                console.log("File " + outputPath + " saved");
            });
        });
    });
});