diff --git a/apprun-site-cli.js b/apprun-site-cli.js
index a611d29..6775adc 100755
--- a/apprun-site-cli.js
+++ b/apprun-site-cli.js
@@ -73,7 +73,9 @@ program
   .action(async (source, options) => {
     ({ source, options } = await init_options(source, options));
     options.info && console.log(options);
+    options.ssr = false;
     options.save = false;
+    options.dev = true;
     await build(options);
     server(options);
   });
diff --git a/server.js b/server.js
index 777a114..7c0ef87 100644
--- a/server.js
+++ b/server.js
@@ -2,10 +2,12 @@
 
 import { existsSync, statSync, writeFileSync, mkdirSync } from 'fs';
 import { join, resolve } from 'path';
+import { readFileSync } from 'fs';
 import express from 'express';
 import bodyParser from 'body-parser';
 import render from './src/render.js';
 import { info, debug, error, warn } from './src/log.js';
+import vfs from './src/vfs.js';
 
 export let config = {};
 
@@ -26,7 +28,8 @@ export default function (_config = {}) {
   app.use(bodyParser.urlencoded({ extended: true }));
 
   set_api(app, source);
-  set_push(app, source);
+  set_action(app, source);
+  set_vfs(app, root);
   set_ssr(app, root, port, ssr, save);
 
   app.use((err, req, res, next) => {
@@ -38,6 +41,55 @@ export default function (_config = {}) {
   return app;
 }
 
+export function set_vfs(app, root) {
+  app.use((req, res, next) => {
+    const reqPath = join(root, req.path);
+    if (vfs.has(reqPath)) {
+      const asset = vfs.get(reqPath);
+      res.set('Content-Type', asset.type);
+      res.send(asset.content);
+      return;
+    }
+    next();
+  });
+}
+
+// export function send_live_reload(req, res, next) {
+//   const reqPath = req.path;
+//   if (reqPath.endsWith('.html') || reqPath === '/') {
+//     const filePath = join(root, reqPath === '/' ? 'index.html' : reqPath);
+//     if (existsSync(filePath)) {
+//       const data = readFileSync(filePath, 'utf8');
+//       const injectedData = data.replace(
+//         /<\/body>/i,
+//         `<script>
+//             const protocol = window.location.protocol === 'http:' ? 'ws://' : 'wss://';
+//             const address = protocol + window.location.host + window.location.pathname + '/ws';
+//             const ws = new WebSocket(address);
+//             ws.onmessage = (event) => {
+//               const message = JSON.parse(event.data);
+//               if (message.type === 'css') {
+//                 const links = document.querySelectorAll('link[rel="stylesheet"]');
+//                 links.forEach(link => {
+//                   const href = link.getAttribute('href');
+//                   if (href.includes(message.path)) {
+//                     const newHref = href.split('?')[0] + '?t=' + new Date().getTime();
+//                     link.setAttribute('href', newHref);
+//                   }
+//                 });
+//               } else if (message.type === 'js' || message.type === 'md') {
+//                 location.reload();
+//               }
+//             };
+//           </script></body>`
+//       );
+//       res.type('.html').send(injectedData);
+//       return;
+//     }
+//   }
+//   next();
+// }
+
 export function set_ssr(app, root, port, ssr, save) {
 
   app.get('*', async (req, res, next) => {
@@ -135,7 +187,7 @@ export function set_api(app, source) {
   });
 }
 
-export function set_push(app, source) {
+export function set_action(app, source) {
 
   app.get('/_/*', async (req, res, next) => {
     try {
@@ -175,7 +227,6 @@ export function set_push(app, source) {
   });
 }
 
-
 function find_js(req_path, root) {
   let path = req_path.replace('/_', '');
   const segments = path.split('/').filter(segment => segment !== '');
diff --git a/src/build-css.js b/src/build-css.js
index b933edd..d81ab25 100644
--- a/src/build-css.js
+++ b/src/build-css.js
@@ -3,6 +3,7 @@ import { existsSync, writeFileSync, readFileSync, copyFileSync } from 'fs';
 import chalk from 'chalk';
 const { cyan, yellow, blue, green, magenta, gray, red } = chalk;
 import { exec } from 'child_process';
+import vfs from './vfs.js';
 
 export const build_tailwind = async (from, to, config) => {
   const { source, pages, output, relative, should_ignore } = config;
@@ -44,7 +45,12 @@ export const build_css = async (from, to, config) => {
       console.warn(err.toString());
     }
 
+
+    vfs.set(to, result.css, 'text/css');
+    // notifyChange('css', filePath);
+
     writeFileSync(to, result.css);
+
     console.log(cyan('Compiled CSS with PostCss'), relative(to));
 
   } catch (err) {
diff --git a/src/build.js b/src/build.js
index 7b5d881..e3143ca 100644
--- a/src/build.js
+++ b/src/build.js
@@ -63,14 +63,9 @@ const render_routes = async ({ output, relative}) => {
 const run_build = async (config) => {
   const start_time = Date.now();
   routes.length = 0;
-  // css_files.length = 0;
   await walk(config.pages, config);
   await build_main(config);
-  await run_bundle(config);
-  // for (const [from, to] of css_files) {
-  //   await build_css(from, to, config);
-  // }
-  // css_files.length = 0;
+  // await run_bundle(config);
   const elapsed = Date.now() - start_time;
   console.log(cyan(`Build done in ${elapsed} ms.`));
 }
@@ -145,7 +140,7 @@ export default async (config) => {
       }
     }).on('ready', () => {
       ready = true;
-      console.log(cyan('Watching ...'));
+      console.log(yellow('Watching ...'));
     });
   }
 }
diff --git a/src/esbuild.js b/src/esbuild.js
index 6163cf5..9ef909d 100644
--- a/src/esbuild.js
+++ b/src/esbuild.js
@@ -3,8 +3,11 @@ import esbuild from 'esbuild';
 import chalk from 'chalk';
 const { cyan, yellow, blue, green, magenta, gray, red } = chalk;
 import conditionalCompilePlugin from './esbuild-plugin.js';
+import vfs from './vfs.js';
 
-export default async function (file, target, options = {}) {
+export default build_in_memory;
+
+export async function build(file, target, options = {}) {
   try {
     const result = await esbuild.build({
       entryPoints: [file],
@@ -22,6 +25,34 @@ export default async function (file, target, options = {}) {
   }
 }
 
+export async function build_in_memory (file, target, options = {}) {
+  try {
+    const result = await esbuild.build({
+      entryPoints: [file],
+      outfile: target,
+      format: 'esm',
+      bundle: true,
+      sourcemap: true,
+      minify: false,
+      ...options,
+      write: false,
+    });
+    result.errors.length && console.log(red(result.errors));
+    result.warnings.length && console.log(yellow(result.warnings));
+
+    if (result.outputFiles) {
+      result.outputFiles.forEach(f => {
+        const filePath = f.path;
+        const moduleKey = filePath.replace(/\\/g, '/');
+        vfs.set(moduleKey, f.text, 'application/javascript;charset=UTF-8');
+      })
+      // notifyChange('js', filePath);
+    }
+  } catch (e) {
+    console.log(red(e.message));
+  }
+}
+
 export async function bundle(output, entryPoints) {
   try {
     const result = await esbuild.build({
diff --git a/src/vfs.js b/src/vfs.js
new file mode 100644
index 0000000..8b88f02
--- /dev/null
+++ b/src/vfs.js
@@ -0,0 +1,23 @@
+import fs from 'fs';
+import path from 'path';
+
+const assets = new Map();
+
+export const clean = () => assets.clear();
+
+const set = (key, content, type) => assets.set(key, { content, type });
+
+export const get = (key)  => assets.get(key);
+
+export const has = (key) => assets.has(key);
+
+export const dump = (outputDir) => {
+  for (const [key, asset] of assets.entries()) {
+    const { content } = asset;
+    const outputPath = path.join(outputDir, key);
+    fs.mkdirSync(path.dirname(outputPath), { recursive: true });
+    fs.writeFileSync(outputPath, content);
+  }
+}
+
+export default { has, set, get, clean, dump };
\ No newline at end of file