webpack modifications include babel for IE11

samples/react-calendar-feed/gulpfile.js

@@ -2,43 +2,52 @@
 
 const gulp = require('gulp');
 const build = require('@microsoft/sp-build-web');
+const path = require('path');
 build.addSuppression(`Warning - [sass] The local CSS class 'ms-Grid' is not camelCase and will not be type-safe.`);
 
 let needIESupport = true;
-if(!!process.argv && process.argv.length >0) {
-  needIESupport = process.argv.findIndex(item => '--noie11' === item.toLowerCase()) !=-1 ;
+if (!!process.argv && process.argv.length > 0) {
+  needIESupport = process.argv.findIndex(item => '--noie11' === item.toLowerCase()) === -1;
 }
 
+if (needIESupport) {
+  const ie11BabeLoader = {
+    loader: 'babel-loader',
+    options: {
+      presets: [
+        [
+          '@babel/preset-env',
+          {
+            targets: {
+              "ie": "11"
+            }
+          }
+        ]
+      ]
+    }
+  };
+
 
-if(needIESupport){
   process.stdout.write(`Using babel-loader to support IE11 \n`);
   build.configureWebpack.mergeConfig({
     additionalConfiguration: (generatedConfiguration) => {
       generatedConfiguration.module.rules.push({
         test: /\.js$/,
-       exclude: /node_modules\/(?!(rss-paser))/,
-        use: {
-          loader: 'babel-loader',
-          options: {
-            presets: [
-              ["@babel/preset-env",
-                {
-                  targets: {
-                    "ie": "11"
-                  }
-                  
-                }
-              ]
-            ]
-          }
-        }
+        /*
+        This selector increase the webpack time 5 times then without
+          exclude: [/node_modules\/(?!(rss-parser))/],
+          */
+        include: [
+          path.resolve(__dirname, "node_modules/rss-parser"),
+        ],
+        use: [ie11BabeLoader]
       });
-  
+
       return generatedConfiguration;
     }
   });
 } else {
-  process.stdout.write(`No IE11 Support webpack will be 5 times faster \n`);
+  process.stdout.write(`No IE11 Support is set \n`);
 }