Adding BOM

remove-bom.js

var fs = require("fs");
var path = require("path");
var wrench = require("wrench");

var BOM_CHAR_CODE = 65279;
var BOM = String.fromCharCode(BOM_CHAR_CODE);

var fileNames = wrench.readdirSyncRecursive(process.cwd()).filter(function (fileName) {
    return path.extname(fileName) === ".js";
});

fileNames.forEach(function (fileName) {
    fs.readFile(fileName, "utf8", function (err, fileContents) {
        if (err) { throw err; }

        if (fileContents.charCodeAt(0) !== BOM_CHAR_CODE) {
            fs.writeFile(fileName, BOM + fileContents, "utf8", function (err) {
                if (err) { throw err; }
            });
        }
    });
});