fix(init/netlify): purge netlify require cache (remix-run#285)

packages/remix-init/templates/netlify/netlify/functions/server/index.js

@@ -1,5 +1,29 @@
+const path = require("path");
+
 const { createRequestHandler } = require("@remix-run/netlify");
 
-exports.handler = createRequestHandler({
-  build: require("./build")
-});
+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) => {
+        purgeRequireCache();
+        return createRequestHandler({ build: require("./build") })(
+          event,
+          context
+        );
+      };