diff --git a/README.md b/README.md
new file mode 100644
index 0000000..808a8e6
--- /dev/null
+++ b/README.md
@@ -0,0 +1,93 @@
+# Twig asset()
+
+A simple asset function for Twig, which appends the file modification time of the referenced asset file to ensure the browser reloads the resource when it changes. (cache invalidation)
+
+This repository holds the extension for PHP and JS.
+
+
+## Installation
+
+### PHP
+
+1. Add the package to your project.
+    ```sh
+    $ composer require netzstrategen/twig-asset
+    ```
+
+2. Add the extension and configuration to your Twig environment.
+    ```php
+    <?php
+
+    use Netzstrategen\TwigAsset\TwigExtension as TwigAsset;
+
+    $twig->addGlobal('asset_path_document_root', '<path/to/templates>');
+    $twig->addExtension(new TwigAsset());
+    ``` 
+
+### JS
+
+1. Add the package to your project.
+    ```sh
+    $ npm install @netzstrategen/twig-asset --save
+    ```
+
+2. Load the extension with your configuration in your project.
+    ```js
+    const TwigAsset = require('@netzstrategen/twig-asset')({
+      asset_path_document_root: __dirname,
+    });
+
+3. Register the function in your Twig environment:
+    ```js
+    for (const name in TwigAsset) {
+      twig.extendFunction(name, TwigAsset[name]);
+    } 
+    ```
+
+### Third-party integrations
+
+#### [Fractal](https://fractal.build)
+
+```js
+const twigAdapter = require('@netzstrategen/twig-drupal-fractal-adapter');
+const instance = fractal.components.engine(twigAdapter);
+instance.twig.extendFunction('asset', TwigAsset.asset);
+``` 
+
+
+## Configuration
+
+- `asset_path_document_root` (string, required): Path to the document root.
+
+    Acts as a base path. The path passed to the asset() function will be appended
+    to this base path in order to retrieve the file's modification time.
+
+## Usage
+
+```twig
+<link rel="stylesheet" href="{{ asset('/path/from/root.css') }}">
+```
+yields:
+```html
+<link rel="stylesheet" href="/path/from/root.css?v=1565339299">
+```
+
+### Parameters
+
+- `add_version` (bool, optional): Whether to append the file modification time. Defaults to `true`.
+
+    Example:
+    ```twig
+    <link rel="stylesheet" href="{{ asset('/path/from/root.css', false) }}">
+    ```
+    yields:
+    ```html
+    <link rel="stylesheet" href="/path/from/root.css">
+    ```
+
+
+## Alternatives to this package
+
+See Symfony for a more sophisticated solution (PHP only):
+- [Symfony Asset Component](https://symfony.com/doc/current/components/asset.html)
+- [Symfony Encore](https://symfony.com/doc/current/frontend/encore/versioning.html)
diff --git a/composer.json b/composer.json
index efa7420..f188cd2 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
-  "name": "cue/twig_extensions",
-  "description": "Fractal integration for Drupal.",
+  "name": "netzstrategen/twig-asset",
+  "description": "asset() function for Twig.",
   "license": "GPL-2.0+",
   "authors": [
     {
@@ -14,7 +14,7 @@
   ],
   "autoload": {
     "psr-4": {
-      "Cue\\twig_extensions\\": "src/"
+      "Netzstrategen\\TwigAsset\\": "php/"
     }
   }
 }
diff --git a/js/functions.js b/js/functions.js
new file mode 100644
index 0000000..93b3972
--- /dev/null
+++ b/js/functions.js
@@ -0,0 +1,31 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const querystring = require('querystring');
+
+module.exports = (config = {}) => {
+
+  config = Object.assign({
+    add_version: true,
+  }, config);
+
+  return {
+    asset: (asset_path) => {
+      if (!config.asset_path_document_root) {
+        return asset_path;
+      }
+      const absolute_path = path.join(config.asset_path_document_root, asset_path);
+      if (config.add_version && fs.existsSync(absolute_path)) {
+        const stats = fs.statSync(absolute_path);
+        const filemtime = Math.floor(stats.mtimeMs / 1000);
+        const query_string = querystring.stringify({
+          v: filemtime,
+        });
+        asset_path += `?${query_string}`;
+      }
+      return asset_path;
+    }
+  }
+
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..1c74d9a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "@netzstrategen/twig-asset",
+  "version": "1.0.0",
+  "description": "asset() function for Twig.",
+  "main": "js/functions.js",
+  "files": ["js/*"],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/netzstrategen/twig-asset.git"
+  },
+  "author": "Fabian Marz <fabian@netzstrategen.com>",
+  "contributors": [
+    "Daniel Kudwien <daniel@netzstrategen.com>"
+  ],
+  "license": "GPL-2.0+",
+  "bugs": {
+    "url": "https://github.com/netzstrategen/twig-asset/issues"
+  },
+  "homepage": "https://github.com/netzstrategen/twig-asset#readme"
+}
diff --git a/php/TwigExtension.php b/php/TwigExtension.php
new file mode 100644
index 0000000..2eecfcf
--- /dev/null
+++ b/php/TwigExtension.php
@@ -0,0 +1,53 @@
+<?php
+
+/**
+ * @file
+ * Contains \Netzstrategen\TwigAsset\TwigExtension.
+ */
+
+namespace Netzstrategen\TwigAsset;
+
+use Twig_Environment;
+use Twig_Extension;
+use Twig_ExtensionInterface;
+use Twig_SimpleFunction;
+
+class TwigExtension extends Twig_Extension implements Twig_ExtensionInterface {
+
+  public function getFunctions() {
+    return [
+      new Twig_SimpleFunction('asset', [$this, 'getAssetPath'], [
+        'needs_environment' => TRUE,
+      ]),
+    ];
+  }
+
+  /**
+   * Appends the modification time to the given asset file path.
+   *
+   * @param Twig_Environment $env
+   *   The current Twig environment.
+   * @param string $path
+   *   The path to the asset file relative to the Twig environment.
+   * @param bool $add_version
+   *   Whether to append the file modification time. Defaults to TRUE.
+   *
+   * @return string
+   */
+  public static function getAssetPath(Twig_Environment $env, string $path, bool $add_version = TRUE): string {
+    $globals = $env->getGlobals();
+    if (!empty($globals['asset_path_document_root'])) {
+      $asset_root = realpath($globals['asset_path_document_root']);
+      $absolute_path = $asset_root . '/' . $path;
+
+      if ($add_version && file_exists($absolute_path)) {
+        $query_string = http_build_query([
+          'v' => filemtime($absolute_path),
+        ]);
+        $path .= '?' . $query_string;
+      }
+    }
+    return $path;
+  }
+
+}
diff --git a/src/TwigExtensions.php b/src/TwigExtensions.php
deleted file mode 100644
index f595f73..0000000
--- a/src/TwigExtensions.php
+++ /dev/null
@@ -1,57 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Cue\twig_extensions\TwigExtensions.
- */
-
-namespace Cue\twig_extensions;
-
-use Twig_Environment;
-use Twig_Extension;
-use Twig_SimpleFunction;
-use Waiter\WaiterConfig;
-use Waiter\WaiterHelper;
-
-/**
- * @implements Twig_ExtensionInterface
- */
-class TwigExtensions extends Twig_Extension {
-
-  public function getFunctions() {
-    return [
-      new Twig_SimpleFunction('asset', [$this, 'getAssetPath'], [
-        'needs_environment' => TRUE,
-      ]),
-    ];
-  }
-
-  /**
-   * Appends the filemtime to the given asset path to ensure cache invalidation.
-   *
-   * @param Twig_Environment $env
-   *   The current Twig environment.
-   * @param $asset_path
-   *   The given path to the asset.
-   * @param bool $is_versioned
-   *   If the asset should be versioned by appending the filemtime.
-   *
-   * @return string
-   */
-  public static function getAssetPath(Twig_Environment $env, $asset_path, $is_versioned = TRUE): string {
-    $globals = $env->getGlobals();
-    $context_publication = $globals['contextPublication'];
-    $template_path = realpath($context_publication['templateDir']);
-    $asset_abspath = $template_path . '/' . $asset_path;
-
-    if (is_dir($template_path) && is_file($asset_abspath) && $is_versioned) {
-      $query_string = http_build_query([
-        'v' => filemtime($asset_abspath),
-      ]);
-      $asset_path = $asset_path . '?' . $query_string;
-    }
-
-    return $asset_path;
-  }
-
-}