diff --git a/.changeset/busy-crabs-swim.md b/.changeset/busy-crabs-swim.md
new file mode 100644
index 00000000..fd40035e
--- /dev/null
+++ b/.changeset/busy-crabs-swim.md
@@ -0,0 +1,5 @@
+---
+"stack54": patch
+---
+
+Execute transform hook in dev/serve mode
diff --git a/packages/core/src/core/build/index.ts b/packages/core/src/core/build/index.ts
index e394d0b3..62a1970d 100644
--- a/packages/core/src/core/build/index.ts
+++ b/packages/core/src/core/build/index.ts
@@ -40,7 +40,7 @@ export function* build({ cwd, ..._ }: EntryOption) {
 
   const mode = process.env.NODE_ENV ?? "production";
 
-  const shared_vite_config = make_vite_config(resolved_config, {
+  const shared_vite_config = yield* make_vite_config(resolved_config, {
     mode,
     command,
   });
diff --git a/packages/core/src/core/dev/index.ts b/packages/core/src/core/dev/index.ts
index f2eacc26..ff3fc48f 100644
--- a/packages/core/src/core/dev/index.ts
+++ b/packages/core/src/core/dev/index.ts
@@ -110,7 +110,7 @@ export function* setup(
 
   const mode = process.env.NODE_ENV ?? "development";
 
-  const shared_vite_config = make_vite_config(resolved_config, {
+  const shared_vite_config = yield* make_vite_config(resolved_config, {
     mode,
     command,
   });
diff --git a/packages/core/src/core/utils/vite.ts b/packages/core/src/core/utils/vite.ts
index 3ff94b83..a90cf908 100644
--- a/packages/core/src/core/utils/vite.ts
+++ b/packages/core/src/core/utils/vite.ts
@@ -26,7 +26,7 @@ export function get_svelte_config(config: ResolvedConfig) {
   return { ...svelte_config, preprocess: preprocessors };
 }
 
-export function make_vite_config(
+export function* make_vite_config(
   config: ResolvedConfig,
   { mode, command, logger }: CreateViteOptions,
 ) {
@@ -51,7 +51,7 @@ export function make_vite_config(
     resolve: { conditions: ["browser", "default"] },
     plugins: [
       svelte(config.svelte) as vite.PluginOption,
-      integrations_container_plugin(config),
+      yield* integrations_container_plugin(config),
       ...(plugins ?? []),
     ],
     optimizeDeps:
diff --git a/packages/core/src/core/vite-plugins/integrations/index.ts b/packages/core/src/core/vite-plugins/integrations/index.ts
index 54ecf6ab..2cd02870 100644
--- a/packages/core/src/core/vite-plugins/integrations/index.ts
+++ b/packages/core/src/core/vite-plugins/integrations/index.ts
@@ -1,8 +1,22 @@
+import { call, Operation, useScope } from "effection";
 import { Plugin } from "vite";
+
+import type { Processed } from "svelte/compiler";
+import * as compiler from "svelte/compiler";
+
 import { ResolvedConfig } from "../../config/index.js";
+import {
+  run_html_post_transform,
+  run_html_pre_transform,
+} from "../../integrations/hooks.js";
+
+export function* integrations_container_plugin(
+  config: ResolvedConfig,
+): Operation<Plugin> {
+  const scope = yield* useScope();
 
-export function integrations_container_plugin(config: ResolvedConfig): Plugin {
   return {
+    apply: "serve",
     name: "stack54:integrations",
     async configureServer(server) {
       const callbacks = await Promise.all(
@@ -10,12 +24,34 @@ export function integrations_container_plugin(config: ResolvedConfig): Plugin {
           const plugin =
             integration instanceof Promise ? await integration : integration;
           return plugin.configureServer?.call(plugin, server);
-        })
+        }),
       );
 
       return () => {
         callbacks.forEach((fn) => fn?.());
       };
     },
+    transform: {
+      order: "pre",
+      async handler(code, filename) {
+        return scope.run(function* () {
+          const preprocessors = config.svelte.preprocess ?? [];
+
+          const processed: Processed = yield* call(() =>
+            compiler.preprocess(code, preprocessors, { filename }),
+          );
+
+          const pre = yield* run_html_pre_transform(config, {
+            code: processed.code,
+            filename,
+          });
+
+          return yield* run_html_post_transform(config, {
+            filename,
+            code: pre,
+          });
+        });
+      },
+    },
   };
 }