diff --git a/packages/kbn-plugin-helpers/.node-version b/packages/kbn-plugin-helpers/.node-version
index f83fc4b9fef1..495f00468fb9 100644
--- a/packages/kbn-plugin-helpers/.node-version
+++ b/packages/kbn-plugin-helpers/.node-version
@@ -1 +1 @@
-6.10.2
\ No newline at end of file
+^6.0.0
\ No newline at end of file
diff --git a/packages/kbn-plugin-helpers/bin/plugin-helpers.js b/packages/kbn-plugin-helpers/bin/plugin-helpers.js
index 179d3b6832f2..b7c3c22db6d0 100755
--- a/packages/kbn-plugin-helpers/bin/plugin-helpers.js
+++ b/packages/kbn-plugin-helpers/bin/plugin-helpers.js
@@ -1,12 +1,9 @@
 #!/usr/bin/env node
 
-var fs = require('fs');
-var path = require('path');
-
-var nodeMajorVersion = parseFloat(process.version.replace(/^v(\d+)\..+/, '$1'));
+const nodeMajorVersion = parseFloat(process.version.replace(/^v(\d+)\..+/, '$1'));
 if (nodeMajorVersion < 6) {
   console.error('FATAL: kibana-plugin-helpers requires node 6+');
   process.exit(1);
 }
 
-require('../cli');
\ No newline at end of file
+require('../cli');
diff --git a/packages/kbn-plugin-helpers/lib/config_file.js b/packages/kbn-plugin-helpers/lib/config_file.js
index 03ce6854f749..177047a0f732 100644
--- a/packages/kbn-plugin-helpers/lib/config_file.js
+++ b/packages/kbn-plugin-helpers/lib/config_file.js
@@ -1,9 +1,9 @@
-var resolve = require('path').resolve;
-var readFileSync = require('fs').readFileSync;
+const resolve = require('path').resolve;
+const readFileSync = require('fs').readFileSync;
 
-var configFiles = [ '.kibana-plugin-helpers.json', '.kibana-plugin-helpers.dev.json' ];
-var configCache = {};
-var KIBANA_ROOT_OVERRIDE = process.env.KIBANA_ROOT ? resolve(process.env.KIBANA_ROOT) : null;
+const configFiles = [ '.kibana-plugin-helpers.json', '.kibana-plugin-helpers.dev.json' ];
+const configCache = {};
+const KIBANA_ROOT_OVERRIDE = process.env.KIBANA_ROOT ? resolve(process.env.KIBANA_ROOT) : null;
 
 module.exports = function (root) {
   if (!root) root = process.cwd();
@@ -13,11 +13,11 @@ module.exports = function (root) {
   }
 
   // config files to read from, in the order they are merged together
-  var config = configCache[root] = {};
+  let config = configCache[root] = {};
 
   configFiles.forEach(function (configFile) {
     try {
-      var content = JSON.parse(readFileSync(resolve(root, configFile)));
+      const content = JSON.parse(readFileSync(resolve(root, configFile)));
       config = Object.assign(config, content);
     } catch (e) {
       // noop
diff --git a/packages/kbn-plugin-helpers/lib/docs.js b/packages/kbn-plugin-helpers/lib/docs.js
index 3870555d0755..bc3e6ac06452 100644
--- a/packages/kbn-plugin-helpers/lib/docs.js
+++ b/packages/kbn-plugin-helpers/lib/docs.js
@@ -1,13 +1,13 @@
-var resolve = require('path').resolve;
-var readFileSync = require('fs').readFileSync;
+const resolve = require('path').resolve;
+const readFileSync = require('fs').readFileSync;
 
 function indent(txt, n) {
-  var space = (new Array(n + 1)).join(' ');
+  const space = (new Array(n + 1)).join(' ');
   return space + txt.split('\n').join('\n' + space);
 }
 
 module.exports = function docs(name) {
-  var md = readFileSync(resolve(__dirname, '../tasks', name, 'README.md'), 'utf8');
+  const md = readFileSync(resolve(__dirname, '../tasks', name, 'README.md'), 'utf8');
 
   return function () {
     console.log('\n  Docs:');
diff --git a/packages/kbn-plugin-helpers/lib/enable_collecting_unknown_options.js b/packages/kbn-plugin-helpers/lib/enable_collecting_unknown_options.js
index 87121df2607f..3a5290d3cd25 100644
--- a/packages/kbn-plugin-helpers/lib/enable_collecting_unknown_options.js
+++ b/packages/kbn-plugin-helpers/lib/enable_collecting_unknown_options.js
@@ -1,9 +1,9 @@
 
 module.exports = function enableCollectingUnknownOptions(command) {
-  var origParse = command.parseOptions;
+  const origParse = command.parseOptions;
   command.allowUnknownOption();
   command.parseOptions = function (argv) {
-    var opts = origParse.call(this, argv);
+    const opts = origParse.call(this, argv);
     this.unknownOptions = opts.unknown;
     return opts;
   };
diff --git a/packages/kbn-plugin-helpers/lib/index.js b/packages/kbn-plugin-helpers/lib/index.js
index d86a30e98d59..751f498a86c0 100644
--- a/packages/kbn-plugin-helpers/lib/index.js
+++ b/packages/kbn-plugin-helpers/lib/index.js
@@ -1,5 +1,5 @@
-var run = require('./run');
-var utils = require('./utils');
+const run = require('./run');
+const utils = require('./utils');
 
 module.exports = function () {
   console.error(
diff --git a/packages/kbn-plugin-helpers/lib/plugin_config.js b/packages/kbn-plugin-helpers/lib/plugin_config.js
index 3734933aff35..bf44c7393599 100644
--- a/packages/kbn-plugin-helpers/lib/plugin_config.js
+++ b/packages/kbn-plugin-helpers/lib/plugin_config.js
@@ -1,14 +1,14 @@
-var resolve = require('path').resolve;
-var statSync = require('fs').statSync;
-var configFile = require('./config_file');
+const resolve = require('path').resolve;
+const statSync = require('fs').statSync;
+const configFile = require('./config_file');
 
 module.exports = function (root) {
   if (!root) root = process.cwd();
 
-  var pkg = require(resolve(root, 'package.json'));
-  var config = configFile(root);
+  const pkg = require(resolve(root, 'package.json'));
+  const config = configFile(root);
 
-  var buildSourcePatterns = [
+  const buildSourcePatterns = [
     'package.json',
     'index.js',
     '{lib,public,server,webpackShims}/**/*',
@@ -35,7 +35,7 @@ module.exports = function (root) {
 
 function fileExists(path) {
   try {
-    var stat = statSync(path);
+    const stat = statSync(path);
     return stat.isFile();
   } catch (e) {
     return false;
diff --git a/packages/kbn-plugin-helpers/lib/run.js b/packages/kbn-plugin-helpers/lib/run.js
index 581c818d015d..040f0e32c76b 100644
--- a/packages/kbn-plugin-helpers/lib/run.js
+++ b/packages/kbn-plugin-helpers/lib/run.js
@@ -1,10 +1,10 @@
-var pluginConfig = require('./plugin_config');
-var tasks = require('./tasks');
+const pluginConfig = require('./plugin_config');
+const tasks = require('./tasks');
 
 module.exports = function run(name, options) {
-  var action = tasks[name];
+  const action = tasks[name];
   if (!action) throw new Error('Invalid task: "' + name + '"');
 
-  var plugin = pluginConfig();
+  const plugin = pluginConfig();
   return action(plugin, run, options);
 };
diff --git a/packages/kbn-plugin-helpers/lib/tasks.js b/packages/kbn-plugin-helpers/lib/tasks.js
index d2c76152f248..69f195131a91 100644
--- a/packages/kbn-plugin-helpers/lib/tasks.js
+++ b/packages/kbn-plugin-helpers/lib/tasks.js
@@ -1,8 +1,8 @@
-var buildTask = require('../tasks/build');
-var startTask = require('../tasks/start');
-var testAllTask = require('../tasks/test/all');
-var testBrowserTask = require('../tasks/test/browser');
-var testServerTask = require('../tasks/test/server');
+const buildTask = require('../tasks/build');
+const startTask = require('../tasks/start');
+const testAllTask = require('../tasks/test/all');
+const testBrowserTask = require('../tasks/test/browser');
+const testServerTask = require('../tasks/test/server');
 
 module.exports = {
   build: buildTask,
diff --git a/packages/kbn-plugin-helpers/lib/utils.js b/packages/kbn-plugin-helpers/lib/utils.js
index 03f8e1bdd350..962d63e808cc 100644
--- a/packages/kbn-plugin-helpers/lib/utils.js
+++ b/packages/kbn-plugin-helpers/lib/utils.js
@@ -1,14 +1,14 @@
-var resolve = require('path').resolve;
+const resolve = require('path').resolve;
 
-var pluginConfig = require('./plugin_config');
+const pluginConfig = require('./plugin_config');
 
 function babelRegister() {
-  var plugin = pluginConfig();
+  const plugin = pluginConfig();
   require(resolve(plugin.kibanaRoot, 'src/optimize/babel/register'));
 }
 
 function resolveKibanaPath(path) {
-  var plugin = pluginConfig();
+  const plugin = pluginConfig();
   return resolve(plugin.kibanaRoot, path);
 }
 
diff --git a/packages/kbn-plugin-helpers/lib/win_cmd.js b/packages/kbn-plugin-helpers/lib/win_cmd.js
index 38666a2098db..1d19faa0c123 100644
--- a/packages/kbn-plugin-helpers/lib/win_cmd.js
+++ b/packages/kbn-plugin-helpers/lib/win_cmd.js
@@ -1,4 +1,4 @@
-var platform = require('os').platform();
+const platform = require('os').platform();
 
 module.exports = function winCmd(cmd) {
   return /^win/.test(platform) ? cmd + '.cmd' : cmd;
diff --git a/packages/kbn-plugin-helpers/package.json b/packages/kbn-plugin-helpers/package.json
index 795e29f3e545..26e7b3794151 100644
--- a/packages/kbn-plugin-helpers/package.json
+++ b/packages/kbn-plugin-helpers/package.json
@@ -18,7 +18,6 @@
     "lint": "eslint bin/ help/ tasks/"
   },
   "dependencies": {
-    "@elastic/eslint-config-kibana": "0.0.2",
     "commander": "^2.9.0",
     "del": "^2.2.2",
     "gulp-rename": "1.2.2",
@@ -31,9 +30,12 @@
     "doc": "docs"
   },
   "devDependencies": {
-    "babel-eslint": "4.1.8",
-    "eslint": "1.10.3",
-    "eslint-plugin-mocha": "1.1.0",
+    "@elastic/eslint-config-kibana": "0.5.0",
+    "babel-eslint": "6.1.2",
+    "eslint": "3.11.1",
+    "eslint-plugin-mocha": "4.7.0",
+    "eslint-plugin-babel": "4.0.0",
+    "eslint-plugin-react": "6.10.3",
     "jest": "^17.0.3"
   },
   "repository": {
diff --git a/packages/kbn-plugin-helpers/tasks/build/build_action.js b/packages/kbn-plugin-helpers/tasks/build/build_action.js
index e079f8c604eb..de33067950f0 100644
--- a/packages/kbn-plugin-helpers/tasks/build/build_action.js
+++ b/packages/kbn-plugin-helpers/tasks/build/build_action.js
@@ -1,16 +1,16 @@
-var join = require('path').join;
-var resolve = require('path').resolve;
-var inquirer = require('inquirer');
+const join = require('path').join;
+const resolve = require('path').resolve;
+const inquirer = require('inquirer');
 
-var createBuild = require('./create_build');
-var createPackage = require('./create_package');
+const createBuild = require('./create_build');
+const createPackage = require('./create_package');
 
 module.exports = function (plugin, run, options) {
   options = options || {};
-  var buildVersion = plugin.version;
-  var kibanaVersion = (plugin.pkg.kibana && plugin.pkg.kibana.version) || plugin.pkg.version;
-  var buildFiles = plugin.buildSourcePatterns;
-  var buildTarget = join(plugin.root, 'build');
+  let buildVersion = plugin.version;
+  let kibanaVersion = (plugin.pkg.kibana && plugin.pkg.kibana.version) || plugin.pkg.version;
+  let buildFiles = plugin.buildSourcePatterns;
+  let buildTarget = join(plugin.root, 'build');
 
   // allow source files to be overridden
   if (options.files && options.files.length) {
@@ -22,7 +22,7 @@ module.exports = function (plugin, run, options) {
   if (options.buildVersion) buildVersion = options.buildVersion;
   if (options.kibanaVersion) kibanaVersion = options.kibanaVersion;
 
-  var buildStep;
+  let buildStep;
   if (kibanaVersion === 'kibana') {
     buildStep = askForKibanaVersion().then(function (customKibanaVersion) {
       return createBuild(plugin, buildTarget, buildVersion, customKibanaVersion, buildFiles);
@@ -41,7 +41,7 @@ module.exports = function (plugin, run, options) {
     });
 };
 
-function askForKibanaVersion(cb) {
+function askForKibanaVersion() {
   return inquirer.prompt([
     {
       type: 'input',
diff --git a/packages/kbn-plugin-helpers/tasks/build/build_action.spec.js b/packages/kbn-plugin-helpers/tasks/build/build_action.spec.js
index 5bc1e4c9e6fa..cfe54a6f95b3 100644
--- a/packages/kbn-plugin-helpers/tasks/build/build_action.spec.js
+++ b/packages/kbn-plugin-helpers/tasks/build/build_action.spec.js
@@ -17,7 +17,7 @@ describe('build_action', () => {
 
     it('creates a zip in the build directory', () => {
       return buildAction(PLUGIN).then(() => {
-        var buildFile = resolve(PLUGIN_BUILD_DIR, PLUGIN.id + '-' + PLUGIN.version + '.zip');
+        const buildFile = resolve(PLUGIN_BUILD_DIR, PLUGIN.id + '-' + PLUGIN.version + '.zip');
         if (!fs.existsSync(buildFile)) {
           throw new Error('Build file not found: ' + buildFile);
         }
@@ -26,7 +26,7 @@ describe('build_action', () => {
 
     it('skips zip creation based on flag', function () {
       return buildAction(PLUGIN, noop, { skipArchive: true }).then(() => {
-        var buildFile = resolve(PLUGIN_BUILD_DIR, PLUGIN.id + '-' + PLUGIN.version + '.zip');
+        const buildFile = resolve(PLUGIN_BUILD_DIR, PLUGIN.id + '-' + PLUGIN.version + '.zip');
         if (fs.existsSync(buildFile)) {
           throw new Error('Build file not found: ' + buildFile);
         }
@@ -53,6 +53,7 @@ describe('build_action', () => {
 
       return buildAction(PLUGIN, noop, options).then(() => {
         expect(mockBuild.mock.calls).toHaveLength(1);
+        // eslint-disable-next-line no-unused-vars
         const [ plugin, buildTarget, buildVersion, kibanaVersion, files ] = mockBuild.mock.calls[0];
         expect(buildVersion).toBe('1.2.3');
         expect(kibanaVersion).toBe('4.5.6');
@@ -62,6 +63,7 @@ describe('build_action', () => {
     it('uses default file list without files option', function () {
       return buildAction(PLUGIN).then(() => {
         expect(mockBuild.mock.calls).toHaveLength(1);
+        // eslint-disable-next-line no-unused-vars
         const [ plugin, buildTarget, buildVersion, kibanaVersion, files ] = mockBuild.mock.calls[0];
         PLUGIN.buildSourcePatterns.forEach(file => expect(files).toContain(file));
       });
@@ -79,6 +81,7 @@ describe('build_action', () => {
 
       return buildAction(PLUGIN, noop, options).then(() => {
         expect(mockBuild.mock.calls).toHaveLength(1);
+        // eslint-disable-next-line no-unused-vars
         const [ plugin, buildTarget, buildVersion, kibanaVersion, files ] = mockBuild.mock.calls[0];
         options.files.forEach(file => expect(files).toContain(file));
       });
diff --git a/packages/kbn-plugin-helpers/tasks/build/create_build.js b/packages/kbn-plugin-helpers/tasks/build/create_build.js
index c50fcf495c13..aad1ec9e2fe8 100644
--- a/packages/kbn-plugin-helpers/tasks/build/create_build.js
+++ b/packages/kbn-plugin-helpers/tasks/build/create_build.js
@@ -1,18 +1,17 @@
-var join = require('path').join;
-var relative = require('path').relative;
-var statSync = require('fs').statSync;
-var execFileSync = require('child_process').execFileSync;
-var del = require('del');
-var vfs = require('vinyl-fs');
-var rename = require('gulp-rename');
+const join = require('path').join;
+const relative = require('path').relative;
+const statSync = require('fs').statSync;
+const execFileSync = require('child_process').execFileSync;
+const del = require('del');
+const vfs = require('vinyl-fs');
+const rename = require('gulp-rename');
 
-var rewritePackageJson = require('./rewrite_package_json');
-var gitInfo = require('./git_info');
-var winCmd = require('../../lib/win_cmd');
+const rewritePackageJson = require('./rewrite_package_json');
+const winCmd = require('../../lib/win_cmd');
 
 module.exports = function createBuild(plugin, buildTarget, buildVersion, kibanaVersion, files) {
-  var buildSource = plugin.root;
-  var buildRoot = join(buildTarget, 'kibana', plugin.id);
+  const buildSource = plugin.root;
+  const buildRoot = join(buildTarget, 'kibana', plugin.id);
 
   return del(buildTarget)
     .then(function () {
@@ -24,7 +23,7 @@ module.exports = function createBuild(plugin, buildTarget, buildVersion, kibanaV
 
           // put all files inside the correct directories
           .pipe(rename(function nestFileInDir(path) {
-            var nonRelativeDirname = path.dirname.replace(/^(\.\.\/?)+/g, '');
+            const nonRelativeDirname = path.dirname.replace(/^(\.\.\/?)+/g, '');
             path.dirname = join(relative(buildTarget, buildRoot), nonRelativeDirname);
           }))
 
@@ -35,7 +34,7 @@ module.exports = function createBuild(plugin, buildTarget, buildVersion, kibanaV
     })
     .then(function () {
       // install packages in build
-      var options = {
+      const options = {
         cwd: buildRoot,
         stdio: ['ignore', 'ignore', 'pipe'],
       };
diff --git a/packages/kbn-plugin-helpers/tasks/build/create_package.js b/packages/kbn-plugin-helpers/tasks/build/create_package.js
index e3e3e540b21a..94945a683ced 100644
--- a/packages/kbn-plugin-helpers/tasks/build/create_package.js
+++ b/packages/kbn-plugin-helpers/tasks/build/create_package.js
@@ -1,18 +1,17 @@
-var join = require('path').join;
-var relative = require('path').relative;
-var del = require('del');
-var vfs = require('vinyl-fs');
-var zip = require('gulp-zip');
+const join = require('path').join;
+const relative = require('path').relative;
+const del = require('del');
+const vfs = require('vinyl-fs');
+const zip = require('gulp-zip');
 
-module.exports = function createBuild(plugin, buildVersion) {
-  var buildId = `${plugin.id}-${buildVersion}`;
-  var buildSource = plugin.root;
-  var buildTarget = join(plugin.root, 'build');
-  var buildRoot = join(buildTarget, 'kibana', plugin.id);
+module.exports = function createPackage(plugin, buildVersion) {
+  const buildId = `${plugin.id}-${buildVersion}`;
+  const buildTarget = join(plugin.root, 'build');
+  const buildRoot = join(buildTarget, 'kibana', plugin.id);
 
   // zip up the package
   return new Promise(function (resolve, reject) {
-    var buildFiles = [relative(buildTarget, buildRoot) + '/**/*'];
+    const buildFiles = [relative(buildTarget, buildRoot) + '/**/*'];
 
     vfs.src(buildFiles, { cwd: buildTarget, base: buildTarget })
       .pipe(zip(`${buildId}.zip`))
diff --git a/packages/kbn-plugin-helpers/tasks/build/git_info.js b/packages/kbn-plugin-helpers/tasks/build/git_info.js
index 9595bb5f8128..00a2fbf1d72f 100644
--- a/packages/kbn-plugin-helpers/tasks/build/git_info.js
+++ b/packages/kbn-plugin-helpers/tasks/build/git_info.js
@@ -1,14 +1,14 @@
-var execFileSync = require('child_process').execFileSync;
+const execFileSync = require('child_process').execFileSync;
 
 module.exports = function gitInfo(rootPath) {
   try {
-    var LOG_SEPARATOR = '||';
-    var commitCount = execFileSync('git', ['rev-list', '--count', 'HEAD'], {
+    const LOG_SEPARATOR = '||';
+    const commitCount = execFileSync('git', ['rev-list', '--count', 'HEAD'], {
       cwd: rootPath,
       stdio: ['ignore', 'pipe', 'ignore'],
       encoding: 'utf8',
     });
-    var logLine = execFileSync('git', ['log', '--pretty=%h' + LOG_SEPARATOR + '%cD', '-n', '1'], {
+    const logLine = execFileSync('git', ['log', '--pretty=%h' + LOG_SEPARATOR + '%cD', '-n', '1'], {
       cwd: rootPath,
       stdio: ['ignore', 'pipe', 'ignore'],
       encoding: 'utf8',
diff --git a/packages/kbn-plugin-helpers/tasks/build/rewrite_package_json.js b/packages/kbn-plugin-helpers/tasks/build/rewrite_package_json.js
index 951e22eb06f4..0b5172bbc6f4 100644
--- a/packages/kbn-plugin-helpers/tasks/build/rewrite_package_json.js
+++ b/packages/kbn-plugin-helpers/tasks/build/rewrite_package_json.js
@@ -1,10 +1,10 @@
-var map = require('through2-map').obj;
-var gitInfo = require('./git_info');
+const map = require('through2-map').obj;
+const gitInfo = require('./git_info');
 
 module.exports = function rewritePackage(buildSource, buildVersion, kibanaVersion) {
   return map(function (file) {
     if (file.basename === 'package.json' && file.dirname === buildSource) {
-      var pkg = JSON.parse(file.contents.toString('utf8'));
+      const pkg = JSON.parse(file.contents.toString('utf8'));
 
       // rewrite the target kibana version while the
       // file is on it's way to the archive
diff --git a/packages/kbn-plugin-helpers/tasks/start/start_action.js b/packages/kbn-plugin-helpers/tasks/start/start_action.js
index 834bd46e7b0a..57d6f647bc22 100644
--- a/packages/kbn-plugin-helpers/tasks/start/start_action.js
+++ b/packages/kbn-plugin-helpers/tasks/start/start_action.js
@@ -1,10 +1,10 @@
-var execFileSync = require('child_process').execFileSync;
+const execFileSync = require('child_process').execFileSync;
 
 module.exports = function (plugin, run, options) {
   options = options || {};
 
-  var cmd = (process.platform === 'win32') ? 'bin\\kibana.bat' : 'bin/kibana';
-  var args = ['--dev', '--plugin-path', plugin.root];
+  const cmd = (process.platform === 'win32') ? 'bin\\kibana.bat' : 'bin/kibana';
+  let args = ['--dev', '--plugin-path', plugin.root];
 
   if (options.flags) {
     args = args.concat(options.flags);
diff --git a/packages/kbn-plugin-helpers/tasks/test/browser/test_browser_action.js b/packages/kbn-plugin-helpers/tasks/test/browser/test_browser_action.js
index 800b4413f601..deb7cacb29d3 100644
--- a/packages/kbn-plugin-helpers/tasks/test/browser/test_browser_action.js
+++ b/packages/kbn-plugin-helpers/tasks/test/browser/test_browser_action.js
@@ -1,10 +1,10 @@
-var execFileSync = require('child_process').execFileSync;
-var winCmd = require('../../../lib/win_cmd');
+const execFileSync = require('child_process').execFileSync;
+const winCmd = require('../../../lib/win_cmd');
 
 module.exports = function testBrowserAction(plugin, run, options) {
   options = options || {};
 
-  var kbnServerArgs = [
+  const kbnServerArgs = [
     '--kbnServer.plugin-path=' + plugin.root
   ];
 
@@ -14,8 +14,8 @@ module.exports = function testBrowserAction(plugin, run, options) {
     kbnServerArgs.push('--kbnServer.tests_bundle.pluginId=' + plugin.id);
   }
 
-  var task = (options.dev) ? 'test:dev' : 'test:browser';
-  var args = ['run', task, '--'].concat(kbnServerArgs);
+  const task = (options.dev) ? 'test:dev' : 'test:browser';
+  const args = ['run', task, '--'].concat(kbnServerArgs);
   execFileSync(winCmd('npm'), args, {
     cwd: plugin.kibanaRoot,
     stdio: ['ignore', 1, 2]
diff --git a/packages/kbn-plugin-helpers/tasks/test/server/test_server_action.js b/packages/kbn-plugin-helpers/tasks/test/server/test_server_action.js
index ece425e3b7e3..a4fbcfb2f9a7 100644
--- a/packages/kbn-plugin-helpers/tasks/test/server/test_server_action.js
+++ b/packages/kbn-plugin-helpers/tasks/test/server/test_server_action.js
@@ -1,23 +1,23 @@
-var resolve = require('path').resolve;
-var delimiter = require('path').delimiter;
-var execFileSync = require('child_process').execFileSync;
-var winCmd = require('../../../lib/win_cmd');
+const resolve = require('path').resolve;
+const delimiter = require('path').delimiter;
+const execFileSync = require('child_process').execFileSync;
+const winCmd = require('../../../lib/win_cmd');
 
 module.exports = function (plugin, run, options) {
   options = options || {};
-  var kibanaBins = resolve(plugin.kibanaRoot, 'node_modules/.bin');
-  var mochaSetupJs = resolve(plugin.kibanaRoot, 'test/mocha_setup.js');
-  var testPaths = plugin.serverTestPatterns;
+  const kibanaBins = resolve(plugin.kibanaRoot, 'node_modules/.bin');
+  const mochaSetupJs = resolve(plugin.kibanaRoot, 'test/mocha_setup.js');
+  let testPaths = plugin.serverTestPatterns;
 
   // allow server test files to be overridden
   if (options.files && options.files.length) {
     testPaths = options.files;
   }
 
-  var fullCmd = resolve(plugin.kibanaRoot, 'node_modules', '.bin', 'mocha');
-  var cmd = winCmd(fullCmd);
-  var args = ['--require', mochaSetupJs].concat(testPaths);
-  var path = `${kibanaBins}${delimiter}${process.env.PATH}`;
+  const fullCmd = resolve(plugin.kibanaRoot, 'node_modules', '.bin', 'mocha');
+  const cmd = winCmd(fullCmd);
+  const args = ['--require', mochaSetupJs].concat(testPaths);
+  const path = `${kibanaBins}${delimiter}${process.env.PATH}`;
 
   execFileSync(cmd, args, {
     cwd: plugin.root,