add babel

.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["env"]
+}

gulpfile.js

@@ -1,6 +1,7 @@
 const gulp = require('gulp')
 
 // gulp plugins
+const babel = require('gulp-babel');
 const eslint = require('gulp-eslint')
 const htmllint = require('gulp-html-linter')
 const htmlmin = require('gulp-htmlmin')
@@ -49,6 +50,7 @@ gulp.task('js', () =>
   gulp.src('src/js/*.js')
     .pipe(eslint())
     .pipe(eslint.format())
+    .pipe(babel())
     .pipe(minify({
       ext:{
           src:'.js',

package.json

@@ -1,5 +1,7 @@
 {
   "devDependencies": {
+    "babel-core": "^6.26.3",
+    "babel-preset-env": "^1.7.0",
     "browser-sync": "^2.23.7",
     "eslint-config-standard": "^11.0.0",
     "eslint-plugin-import": "^2.11.0",
@@ -7,6 +9,7 @@
     "eslint-plugin-promise": "^3.7.0",
     "eslint-plugin-standard": "^3.0.1",
     "gulp": "^3.9.1",
+    "gulp-babel": "^7.0.1",
     "gulp-csso": "^3.0.1",
     "gulp-eslint": "^4.0.2",
     "gulp-html-linter": "^1.0.0",
@@ -14,5 +17,6 @@
     "gulp-less": "^4.0.0",
     "gulp-lesshint": "^5.0.0",
     "gulp-minify": "^2.1.0"
-  }
+  },
+  "dependencies": {}
 }