force webpack to only emit one file when using dynamic import

Gruntfile.js

@@ -288,7 +288,10 @@ module.exports = function (grunt) {
                     libraryTarget: "commonjs2"
                 },
                 plugins: [
-                    new webpack.DefinePlugin(BUILD_CONSTANTS)
+                    new webpack.DefinePlugin(BUILD_CONSTANTS),
+                    new webpack.optimize.LimitChunkCountPlugin({
+                        maxChunks: 1
+                    })
                 ],
             },
             nodeProd: {
@@ -305,7 +308,10 @@ module.exports = function (grunt) {
                     libraryTarget: "commonjs2"
                 },
                 plugins: [
-                    new webpack.DefinePlugin(BUILD_CONSTANTS)
+                    new webpack.DefinePlugin(BUILD_CONSTANTS),
+                    new webpack.optimize.LimitChunkCountPlugin({
+                        maxChunks: 1
+                    })
                 ],
                 optimization: {
                     minimizer: [
@@ -333,7 +339,10 @@ module.exports = function (grunt) {
                     libraryTarget: "commonjs2"
                 },
                 plugins: [
-                    new webpack.DefinePlugin(BUILD_CONSTANTS)
+                    new webpack.DefinePlugin(BUILD_CONSTANTS),
+                    new webpack.optimize.LimitChunkCountPlugin({
+                        maxChunks: 1
+                    })
                 ],
                 optimization: {
                     minimizer: [

package-lock.json

@@ -780,6 +780,11 @@
         "regenerator-runtime": "^0.12.0"
       },
       "dependencies": {
+        "core-js": {
+          "version": "2.6.4",
+          "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.4.tgz",
+          "integrity": "sha512-05qQ5hXShcqGkPZpXEFLIpxayZscVD2kuMBZewxiIPPEagukO4mqgPA9CWhUvFBJfy3ODdK2p9xyHh7FTU9/7A=="
+        },
         "regenerator-runtime": {
           "version": "0.12.1",
           "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.12.1.tgz",