diff --git a/demo/17-milestone-with-framework/config/webpack/configs/watch.ts b/demo/17-milestone-with-framework/config/webpack/configs/watch.ts
new file mode 100644
index 0000000..235f683
--- /dev/null
+++ b/demo/17-milestone-with-framework/config/webpack/configs/watch.ts
@@ -0,0 +1,6 @@
+import { isWatch } from './../utils/env';
+import { ConfigTweaker } from '../utils/types';
+
+export const loadScript: ConfigTweaker = (config, resolver) => {
+  config.watch(isWatch);
+};
diff --git a/demo/17-milestone-with-framework/config/webpack/utils/env.ts b/demo/17-milestone-with-framework/config/webpack/utils/env.ts
index a7a1e5e..14f8b45 100644
--- a/demo/17-milestone-with-framework/config/webpack/utils/env.ts
+++ b/demo/17-milestone-with-framework/config/webpack/utils/env.ts
@@ -12,3 +12,5 @@ export const isBuilding = dev || prod;
 export const shouldMinify = prod;
 
 export const sourcemap = argv.devtool !== undefined ? argv.devtool : isDevMode;
+
+export const isWatch = argv.watch !== undefined;
diff --git a/demo/17-milestone-with-framework/package.json b/demo/17-milestone-with-framework/package.json
index a16ce8f..8e71b5a 100644
--- a/demo/17-milestone-with-framework/package.json
+++ b/demo/17-milestone-with-framework/package.json
@@ -1,7 +1,7 @@
 {
   "scripts": {
     "start": "cross-env TS_NODE_PROJECT=config/tsconfig-for-webpack-config.json webpack-dev-server --open --config=config/webpack/webpack.server.ts",
-    "build": "npm run build:prod",
+    "build": "npm run build:prod --",
     "build:dev": "cross-env TS_NODE_PROJECT=config/tsconfig-for-webpack-config.json webpack --config=config/webpack/webpack.dev.ts",
     "build:prod": "cross-env TS_NODE_PROJECT=config/tsconfig-for-webpack-config.json webpack --config=config/webpack/webpack.prod.ts",
     "test": "open dist/index.html"
diff --git a/demo/17-milestone-with-framework/src/features/index.ts b/demo/17-milestone-with-framework/src/features/index.ts
index 3ea58b1..2a45eea 100644
--- a/demo/17-milestone-with-framework/src/features/index.ts
+++ b/demo/17-milestone-with-framework/src/features/index.ts
@@ -1,3 +1,4 @@
 import './load-async-dynamic';
 import './load-esnext';
+import './load-es2020';
 import './load-npm';
diff --git a/demo/17-milestone-with-framework/src/features/load-es2020.ts b/demo/17-milestone-with-framework/src/features/load-es2020.ts
new file mode 100644
index 0000000..44884c0
--- /dev/null
+++ b/demo/17-milestone-with-framework/src/features/load-es2020.ts
@@ -0,0 +1,21 @@
+{
+  const def = 42;
+  const data = null ?? def;
+  console.warn('nullish', data);
+}
+
+{
+  type Struct = {
+    arr?: number[];
+    cb?: Function;
+  };
+
+  let inst: Struct = {
+    cb: () => 233,
+  };
+
+  const cbRes = inst.cb?.();
+  const arrRes = inst.arr?.[0];
+
+  console.warn(cbRes, arrRes);
+}
diff --git a/readme.md b/readme.md
index 51811b7..75b428d 100644
--- a/readme.md
+++ b/readme.md
@@ -26,6 +26,7 @@ _还没写文档的_
 - [14-pack-image](demo/14-pack-image)
 - [15-react](demo/15-react)
 - [16-vue](demo/16-vue)
+- [17-milestone-with-framework](demo/17-milestone-with-framework)
 
 <!-- demo end -->