Merge pull request #2761 from carocad/browser-support

Javascript: browser support increased with babel transformation

runtime/JavaScript/.babelrc

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

runtime/JavaScript/package.json

@@ -17,6 +17,9 @@
   },
   "homepage": "https://github.com/antlr/antlr4",
   "devDependencies": {
+    "@babel/core": "^7.8.4",
+    "@babel/preset-env": "^7.8.4",
+    "babel-loader": "^8.0.6",
     "webpack": "^4.41.5",
     "webpack-cli": "^3.3.10"
   },

runtime/JavaScript/webpack.config.js

@@ -15,5 +15,14 @@ module.exports = {
         net: "empty",
         fs: "empty"
     },
-    target: "web"
+    target: "web",
+    module: {
+        rules: [{
+            test: /\.js$/,
+            exclude: /node_modules/,
+            use: {
+                loader: 'babel-loader',
+            }
+        }]
+    }
 }