Get JavaScript console errors in Geb

BrowserLoggingBaseSpec.groovy

package myapp.specs.base

import geb.spock.GebReportingSpec
import spock.lang.Shared

import static org.openqa.selenium.logging.LogType.BROWSER

abstract class BrowserLoggingBaseSpec extends GebReportingSpec {

  void cleanup() {
    try {
      driver.executeScript("console.log('Test finished')")
      def logEntries = driver.manage().logs().get(BROWSER).all
      println "START WebDriver $BROWSER logs"
      logEntries.each {
        println(it)
      }
      println "END WebDriver $BROWSER logs"
    } catch (error) {
      error.printStackTrace()
    }
  }

}

GebConfig.groovy

import org.openqa.selenium.chrome.ChromeDriver
import org.openqa.selenium.firefox.FirefoxDriver
import org.openqa.selenium.chrome.ChromeOptions
import org.openqa.selenium.logging.LoggingPreferences
import org.openqa.selenium.remote.DesiredCapabilities

import static java.util.logging.Level.ALL
import static org.openqa.selenium.logging.LogType.BROWSER
import static org.openqa.selenium.remote.CapabilityType.LOGGING_PREFS

driver = {
	DesiredCapabilities capabilities = DesiredCapabilities.chrome()
	ChromeOptions options = new ChromeOptions()
	options.setExperimentalOption("prefs", ["browser.custom_chrome_frame": false])
	capabilities.setCapability(ChromeOptions.CAPABILITY, options)
	LoggingPreferences logPrefs = new LoggingPreferences()
	logPrefs.enable(BROWSER, ALL)
	capabilities.setCapability(LOGGING_PREFS, logPrefs)

  return new ChromeDriver(capabilities)
}