chore: add some comments

add some comments

Author: simeng-li

packages/experience/vite.config.ts

@@ -27,6 +27,10 @@ const buildConfig = (mode: string): UserConfig => ({
     viteCompression({ disable: mode === 'development', algorithm: 'brotliCompress' }),
   ],
   define: {
+    // TODO: Remove this line after the experience package supports ESM unit test.
+    // Replace all the process.env references with import.meta.env in the experience package then.
+    // 'import.meta.env.DEV_FEATURES_ENABLED': JSON.stringify(process.env.DEV_FEATURES_ENABLED),
+
     // Experience package does not support ESM unit test yet, can not use import.meta.env
     // so we need to define the environment variables here.
     'process.env': {