Add fast serve

samples/react-enhanced-button/gulpfile.js

@@ -13,4 +13,10 @@ build.rig.getTasks = function () {
   return result;
 };
 
+/* fast-serve */
+const { addFastServe } = require("spfx-fast-serve-helpers");
+addFastServe(build);
+/* end of fast-serve */
+
 build.initialize(require('gulp'));
+

samples/react-enhanced-button/package.json

@@ -9,7 +9,8 @@
   "scripts": {
     "build": "gulp bundle",
     "clean": "gulp clean",
-    "test": "gulp test"
+    "test": "gulp test",
+    "serve": "fast-serve"
   },
   "dependencies": {
     "tslib": "2.3.1",
@@ -37,6 +38,7 @@
     "@types/react": "17.0.45",
     "@types/react-dom": "17.0.17",
     "eslint-plugin-react-hooks": "4.3.0",
-    "@microsoft/sp-module-interfaces": "1.20.1"
+    "@microsoft/sp-module-interfaces": "1.20.1",
+    "spfx-fast-serve-helpers": "~1.19.0"
   }
 }