Set up Babel transpilation

gulpfile.js

@@ -34,6 +34,21 @@ var bannerPlugin = new webpack.BannerPlugin({
   raw: true
 });
 
+var webpackConfigModule = {
+  rules: [
+    {
+      test: /\.m?js$/,
+      exclude: /node_modules/,
+      use: {
+        loader: 'babel-loader',
+        options: {
+          presets: ['@babel/preset-env']
+        }
+      }
+    }
+  ]
+};
+
 // create a single instance of the compiler to allow caching
 var compiler = webpack({
   entry: ENTRY,
@@ -48,7 +63,7 @@ var compiler = webpack({
     // We no not want to minimize our code.
     minimize: false
   },
-
+  module: webpackConfigModule,
   resolve: {
     extensions: ['.js'],
     mainFields: [ 'main' ], // pick ES5 version of vanilla-picker
@@ -65,6 +80,7 @@ var compilerMinimalist = webpack({
     path: DIST,
     filename: NAME_MINIMALIST + '.js'
   },
+  module: webpackConfigModule,
   plugins: [
     bannerPlugin,
     new webpack.IgnorePlugin(new RegExp('^brace$')),

package.json

@@ -34,6 +34,9 @@
     "vanilla-picker": "2.9.2"
   },
   "devDependencies": {
+    "@babel/core": "7.5.5",
+    "@babel/preset-env": "7.5.5",
+    "babel-loader": "8.0.6",
     "date-format": "2.1.0",
     "fancy-log": "1.3.3",
     "gulp": "4.0.2",

src/js/util.js

@@ -1125,9 +1125,9 @@ exports.getIndexForPosition = function(el, row, column) {
  * @returns {Array<{path: String, line: Number, row: Number}>}
  */
 exports.getPositionForPath = function(text, paths) {
-  var me = this;
-  var result = [];
-  var jsmap;
+  const me = this;
+  const result = [];
+  let jsmap;
   if (!paths || !paths.length) {
     return result;
   }
@@ -1139,9 +1139,9 @@ exports.getPositionForPath = function(text, paths) {
   }
 
   paths.forEach(function (path) {
-    var pathArr = me.parsePath(path);
-    var pointerName = exports.compileJSONPointer(pathArr);
-    var pointer = jsmap.pointers[pointerName];
+    const pathArr = me.parsePath(path);
+    const pointerName = exports.compileJSONPointer(pathArr);
+    const pointer = jsmap.pointers[pointerName];
     if (pointer) {
       result.push({
         path: path,
@@ -1152,7 +1152,6 @@ exports.getPositionForPath = function(text, paths) {
   });
 
   return result;
-  
 }
 
 /**
@@ -1163,12 +1162,10 @@ exports.getPositionForPath = function(text, paths) {
  */
 exports.compileJSONPointer = function (path) {
   return path
-      .map(function (p) {
-        return ('/' + String(p)
-                .replace(/~/g, '~0')
-                .replace(/\//g, '~1')
-        );
-      })
+      .map(p => ('/' + String(p)
+          .replace(/~/g, '~0')
+          .replace(/\//g, '~1')
+      ))
       .join('');
 };