diff --git a/src/inject/index.js b/src/inject/index.js
index b0cdedd..f89b9f6 100644
--- a/src/inject/index.js
+++ b/src/inject/index.js
@@ -185,8 +185,14 @@ function getNewContent (target, collection, opt) {
     var startTag = tags[tag].start;
     var endTag = tags[tag].end;
 
+    var injectorTagsRegExp =  getInjectorTagsRegExp(startTag, endTag);
+
+    if (!injectorTagsRegExp.test(contents)) {
+      throw error('Missing inject tags!');
+    }
+
     return contents.replace(
-      getInjectorTagsRegExp(startTag, endTag),
+      injectorTagsRegExp,
       function injector (match, starttag, indent, content, endtag) {
         var starttagArray = opt.removeTags ? [] : [starttag];
         var endtagArray = opt.removeTags ? [] : [endtag];
diff --git a/src/transform/index.js b/src/transform/index.js
index 484cba8..fe15401 100644
--- a/src/transform/index.js
+++ b/src/transform/index.js
@@ -4,7 +4,7 @@ var extname = require('../extname');
 /**
  * Constants
  */
-var TARGET_TYPES = ['html', 'jade', 'slm', 'jsx', 'haml', 'less'];
+var TARGET_TYPES = ['html', 'jade', 'slm', 'jsx', 'haml', 'less', 'twig'];
 var IMAGES = ['jpeg', 'jpg', 'png', 'gif'];
 var DEFAULT_TARGET = TARGET_TYPES[0];
 
@@ -140,6 +140,14 @@ transform.less.less = function(filepath){
 
 transform.less.css = transform.less.less;
 
+transform.twig.css = function (filepath) {
+  return '<link rel="stylesheet" href="{{ asset("' + filepath + '") }}"' + end();
+};
+
+transform.twig.js = function (filepath) {
+  return '<script src="{{ asset("' + filepath + '") }}"></script>';
+};
+
 /**
  * Transformations for jsx is like html
  * but always with self closing tags, invalid jsx otherwise