plugin-version.js

const xml = require('cordova-common').xmlHelpers;
const fs = require('fs');
const path = require('path');

const pluginPath = path.resolve(__dirname, './plugin.xml');
const version = process.env.PLUGIN_VERSION;

if (!version) {
  console.log('No plugin version is specified.');

  return;
}

let doc;

try {
  doc = xml.parseElementtreeSync(pluginPath);
} catch (e) {
  console.error('Parsing ' + pluginPath + ' failed');
  throw e;
}

doc.getroot().attrib['version'] = version;
fs.writeFileSync(pluginPath, doc.write({ indent: 4 }), 'utf-8');