Enable hot reloading

Author: pimterry

package-lock.json

@@ -160,7 +160,7 @@
     "@types/webpack": "^4.4.17",
     "@types/webpack-bundle-analyzer": "^4.6.3",
     "@types/webpack-dev-server": "^3.1.1",
-    "@types/webpack-env": "^1.13.6",
+    "@types/webpack-env": "^1.18.4",
     "@types/webpack-merge": "^4.1.3",
     "arraybuffer-loader": "^1.0.8",
     "assert": "^2.1.0",

package.json

@@ -149,4 +149,8 @@ Promise.race([
             logError('Successfully initialized application, but after timeout');
         });
     });
-});
+});
+
+if (module.hot) {
+    module.hot.accept();
+}

src/index.tsx

@@ -22,7 +22,8 @@
 
         // Limit the global types included, to fix https://github.com/DefinitelyTyped/DefinitelyTyped/issues/33015
         "types": [
-          "node"
+          "node",
+          "webpack-env"
         ],
 
         "plugins": [