Cordova hook to swap out variables in config.xml before preparing, building, or running. Useful to set different api keys per environment (staging, qa, production, etc)

before_prepare.js

#!/usr/bin/env node

/*****************************************************************
 * I'm using this hook to set environment specific variables
 * 
 * This hooks is executed before the following commands:
 * cordova prepare
 * cordova platform add
 * cordova build
 * cordova run
 */


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

const parseString = xml2js.parseString;
const builder = new xml2js.Builder();

const stagingDeploymentKey = "STAGING_KEY";
const productionDeploymentKey = "PROD_KEY";

/************************************************************
 * load our commong config xml and parse it into a JS object
 */
var commonXML = fs.readFileSync(__dirname + '/../configs/common.xml').toString();
var commonObj;
parseString(commonXML, function (err, result) {
  commonObj = result;
});


module.exports = function(context) {
  // set API KEY to staging as default
  var CodePushDeploymentKey = stagingDeploymentKey;

  if (context.opts.options.release === true) {
    // set API KEY to production
    CodePushDeploymentKey = productionDeploymentKey;
  }

  /*******************************************************************/
  // IMPORTANT NOTE:
  // this will definitely be different for everyone.
  // you'll have to do some testing to get the proper value location
  commonObj.widget.platform[1].preference[0].$.value = CodePushDeploymentKey;
  /*******************************************************************/
   
  // write the xml file to the root director of the project so cordova can read it
  var xml = builder.buildObject(commonObj);
  fs.writeFileSync(__dirname + '/../config.xml', xml);
};