First part of gulp tak – converting SVG Sprite to separate files

gulpfile.js

var fs = require('fs');
var DOMParser = require('xmldom').DOMParser;
var timestamp = require('console-timestamp');
var config = require('./config.json');

// open svg sprite file
fs.readFile(config.paths.svg_sprite, 'utf8', function (err, data) {
    if (err) {
        return console.log(timestamp('[hh:mm:ss] ') + "Read file " + config.paths.svg_sprite + " error: " + err);
    }

    console.log(timestamp('[hh:mm:ss] ') + "Creating .svg files...");

    var parser = new DOMParser();
    var svgSpriteContent = parser.parseFromString(data, "image/svg+xml");
    var symbols = svgSpriteContent.getElementsByTagName("symbol");

    for (var i = 0; i < symbols.length; i++) {
        // parse elements from svg sprite
        var pathElement = symbols.item(i).getElementsByTagName("path")[0];
        pathElement.setAttribute("fill", config.image.color);
        var symbolId = symbols.item(i).getAttribute("id");
        var viewBoxVal = symbols.item(i).getAttribute("viewBox");
        var fileHeader = "<svg xmlns=\"http://www.w3.org/2000/svg\" style=\"display: none;\" viewBox=\"" + viewBoxVal + "\">";
        var fileFooter = "</svg>";

        // create separate svg files
        fs.writeFile("./build/svg_files_" + colorName + "/" + symbolId + ".svg",
                fileHeader + pathElement.toString() + fileFooter,
                function (err) {
                    if (err) {
                        return console.log(timestamp('[hh:mm:ss] ') + err);
                    }
                });
    }
    ...