CodeceptJS 1.4.6. Debug White Page Failure - To see the logged page source run your tests with "--verbose"

codecept.conf.js

// Add the plugin to the CodeceptJS config
...

plugins: {
  logPageSource: {
    require: "./logPageSource",
    enabled: true
  }
}

...

logPageSource.js

const Container = require("codeceptjs").container;
const helpers = Container.helpers();
const webdriverio = helpers["WebDriverIO"];
const event = require("codeceptjs").event;

module.exports = function() {
  event.dispatcher.on(event.test.after, async function(test) {
    console.log(await webdriverio.grabSource());
  });
};