const spawn = require('cross-spawn');

/* eslint-disable no-var */
var args = process.argv.slice(2);
/* eslint-enable */

const server = args.indexOf('--dev') > -1
  ? null
  : require('../../examples/server');

if (args.indexOf('--config') === -1) {
  args = args.concat(['--config', 'test/e2e/nightwatch.config.js']);
}
if (args.indexOf('--env') === -1) {
  args = args.concat(['--env', 'phantomjs']);
}
const i = args.indexOf('--test');
if (i > -1) {
  args[i + 1] = `test/e2e/specs/${args[i + 1]}`;
}
if (args.indexOf('phantomjs') > -1) {
  process.env.PHANTOMJS = true;
}

const runner = spawn('./node_modules/.bin/nightwatch', args, {
  stdio: 'inherit'
});

runner.on('exit', (code) => {
  if (server) server.close();
  process.exit(code);
});

runner.on('error', (err) => {
  if (server) server.close();
  throw err;
});

const spawn = require('cross-spawn');

let args = process.argv.slice(2);

const server = args.indexOf('--dev') > -1
  ? null
  : require('../../examples/server');

if (args.indexOf('--config') === -1) {
  args = args.concat(['--config', 'test/e2e/nightwatch.config.js']);
}
if (args.indexOf('--env') === -1) {
  args = args.concat(['--env', 'phantomjs']);
}
const i = args.indexOf('--test');
if (i > -1) {
  args[i + 1] = `test/e2e/specs/${args[i + 1]}`;
}
if (args.indexOf('phantomjs') > -1) {
  process.env.PHANTOMJS = true;
}

const runner = spawn('./node_modules/.bin/nightwatch', args, {
  stdio: 'inherit'
});

runner.on('exit', (code) => {
  if (server) server.close();
  process.exit(code);
});

runner.on('error', (err) => {
  if (server) server.close();
  throw err;
});

--- 
+++ 
@@ -1,6 +1,8 @@
 const spawn = require('cross-spawn');
 
-let args = process.argv.slice(2);
+/* eslint-disable no-var */
+var args = process.argv.slice(2);
+/* eslint-enable */
 
 const server = args.indexOf('--dev') > -1
   ? null
Replace let with var to fix travis build
