chore: add comment about purgeRequireCache

Signed-off-by: Logan McAnsh <logan@mcan.sh>

app/routes/index.tsx

@@ -15,7 +15,7 @@ export let links: LinksFunction = () => {
 };
 
 export let loader: LoaderFunction = async () => {
-  return { message: "this is so awesome 😎" };
+  return { message: "this is so awesome 😎🤘" };
 };
 
 export default function Index() {

netlify/functions/server/server.js

@@ -3,16 +3,24 @@ const path = require("path");
 
 const BUILD_DIR = path.join(process.cwd(), "netlify");
 
+function purgeRequireCache() {
+  // purge require cache on requests for "server side HMR" this won't let
+  // you have in-memory objects between requests in development,
+  // netlify typically does this for you, but we've found it to be hit or
+  // miss and some times requires you to refresh the page after it auto reloads
+  // or even have to restart your server
+  for (let key in require.cache) {
+    if (key.startsWith(BUILD_DIR)) {
+      delete require.cache[key];
+    }
+  }
+}
+
 exports.handler =
   process.env.NODE_ENV === "production"
     ? createRequestHandler({ build: require("./build") })
     : (event, context) => {
-        for (const key of Object.keys(require.cache)) {
-          if (key.startsWith(BUILD_DIR)) {
-            delete require.cache[key];
-          }
-        }
-
+        purgeRequireCache();
         return createRequestHandler({ build: require("./build") })(
           event,
           context