Ionic & Cordova hook for incrementing build & version numbers

increment_build_number.js

#!/usr/bin/env node

// Save hook under `project-root/hooks/before_prepare/`
//
// Don't forget to install xml2js using npm
// `$ npm install xml2js`
// tested with Cordova 7.0.1 & Ionic 3.7.0

var fs = require('fs');
var xml2js = require('xml2js');

// Read config.xml
fs.readFile('config.xml', 'utf8', function(err, data) {
    if(err) {
        return console.log(err);
    }

    // Get XML
    var xml = data;

    // Parse XML to JS Obj
    xml2js.parseString(xml, function (err, result) {
        if(err) {
            return console.log(err);
        }

        // Get JS Obj
        var obj = result;

        // ios-CFBundleVersion doen't exist in config.xml
        if(typeof obj['widget']['$']['ios-CFBundleVersion'] === 'undefined') {
            obj['widget']['$']['ios-CFBundleVersion'] = 0;
        }

        // android-versionCode doen't exist in config.xml
        if(typeof obj['widget']['$']['android-versionCode'] === 'undefined') {
            obj['widget']['$']['android-versionCode'] = 0;
        }

        if(typeof obj['widget']['$']['version'] === 'undefined') {
            obj['widget']['$']['version'] = '0.0.1';
            console.log('Version Undefined; Setting to 0.0.1');
        } else {
             let v = obj['widget']['$']['version'].split('.');

            obj['widget']['$']['version'] = v[0] + '.' + v[1] + '.' + String(Number(v[2]) + 1);
        }

        // Increment build numbers (separately for iOS and Android)
        obj['widget']['$']['ios-CFBundleVersion']++;
        obj['widget']['$']['android-versionCode']++;

        // Build XML from JS Obj
        var builder = new xml2js.Builder();
        var xml = builder.buildObject(obj);

        // Write config.xml
        fs.writeFile('config.xml', xml, function(err) {
            if(err) {
                return console.log(err);
            }

            console.log('Build & version numbers successfully incremented');
        });

    });
});