diff --git a/ScriptHandler.php b/ScriptHandler.php
index e9da04a..ed4cfd9 100644
--- a/ScriptHandler.php
+++ b/ScriptHandler.php
@@ -27,8 +27,6 @@ public static function compileCSS(Event $event)
 
         $processor = new Processor($event->getIO());
 
-        exec('rm -rf ' . __DIR__ . '/var/*');
-
         foreach ($configs as $config) {
             if (!is_array($config)) {
                 throw new \InvalidArgumentException('The extra.css-compiler should contain only configuration objects.');
@@ -38,7 +36,7 @@ public static function compileCSS(Event $event)
                 $processor->attachFiles(__DIR__ . "/{$value}", __DIR__ . "/{$config['output']}");
             }
 
-            $processor->processFiles($config['format'] ?? 'compact');
+            $processor->processFiles(isset($config['format']) ? $config['format'] : 'compact');
         }
 
         $processor->saveOutput();
diff --git a/composer.json b/composer.json
index e29f3f5..85e9dc2 100644
--- a/composer.json
+++ b/composer.json
@@ -1,5 +1,5 @@
 {
-    "name": "eugenematvejev/css_compiler",
+    "name": "eugene-matvejev/css-compiler",
     "description": "compiles css assets from sass or less on composer events",
     "type": "lib",
     "license": "MIT",
@@ -21,7 +21,7 @@
         }
     },
     "require": {
-        "php": ">= 7.0.4",
+        "php": ">= 5.5.9",
         "leafo/lessphp": "^0.5",
         "leafo/scssphp": "0.6.3 as dev-master",
         "leafo/scssphp-compass": "dev-master"
@@ -45,7 +45,6 @@
         "css-compiler": [
             {
                 "format": "compact",
-                "force": true,
                 "input": [
                     "tests/shared-fixtures/scss"
                 ],
@@ -53,7 +52,6 @@
             },
             {
                 "format": "compact",
-                "force": true,
                 "input": [
                     "tests/shared-fixtures/sass"
                 ],
diff --git a/src/Container/File.php b/src/Container/File.php
index 540a607..2f4861b 100644
--- a/src/Container/File.php
+++ b/src/Container/File.php
@@ -31,18 +31,27 @@ class File
      */
     private $type;
 
-    public function __construct(string $sourcePath, string $outputPath)
+    /**
+     * @param string $sourcePath
+     * @param string $outputPath
+     */
+    public function __construct($sourcePath, $outputPath)
     {
         $this->setSourcePath($sourcePath);
         $this->outputPath = $outputPath;
     }
 
-    public function getSourcePath() : string
+    public function getSourcePath()
     {
         return $this->sourcePath;
     }
 
-    public function setSourcePath(string $path) : self
+    /**
+     * @param string $path
+     *
+     * @return File
+     */
+    public function setSourcePath($path)
     {
         $this->sourcePath = $path;
         $this->detectSourceTypeFromPath($path);
@@ -50,62 +59,103 @@ public function setSourcePath(string $path) : self
         return $this;
     }
 
-    public function getOutputPath() : string
+    /**
+     * @return string
+     */
+    public function getOutputPath() 
     {
         return $this->outputPath;
     }
 
-    public function setOutputPath(string $path) : self
+    /**
+     * @param string $path
+     *
+     * @return File
+     */
+    public function setOutputPath($path)
     {
         $this->outputPath = $path;
 
         return $this;
     }
 
-    public function getSourceContent() : string
+    /**
+     * @return string
+     */
+    public function getSourceContent()
     {
         return $this->sourceContent;
     }
 
-    public function setSourceContent(string $content) : self
+    /**
+     * @param string $content
+     *
+     * @return File
+     */
+    public function setSourceContent($content)
     {
         $this->sourceContent = $content;
 
         return $this;
     }
 
-    public function setSourceContentFromSourcePath() : self
+    /**
+     * @return File
+     * @throws FileException
+     */
+    public function setSourceContentFromSourcePath() 
     {
         $this->sourceContent = $this->readSourceContentByPath();
 
         return $this;
     }
 
-    public function getParsedContent() : string
+    /**
+     * @return string
+     */
+    public function getParsedContent()
     {
         return $this->parsedContent;
     }
 
-    public function setParsedContent(string $content) : self
+    /**
+     * @param string $content
+     *
+     * @return File
+     */
+    public function setParsedContent($content) 
     {
         $this->parsedContent = $content;
 
         return $this;
     }
 
-    public function getType() : string
+    /**
+     * @return string
+     */
+    public function getType() 
     {
         return $this->type;
     }
 
-    public function setType(string $type) : self
+    /**
+     * @param string $type
+     *
+     * @return File
+     */
+    public function setType($type)
     {
         $this->type = $type;
 
         return $this;
     }
 
-    private function detectSourceTypeFromPath(string $path)
+    /**
+     * @param string $path
+     * 
+     * @return void
+     */
+    private function detectSourceTypeFromPath($path)
     {
         switch (true) {
             case 0 !== preg_match('/^.*\.' . static::TYPE_SCSS . '/', $path):
@@ -125,6 +175,10 @@ private function detectSourceTypeFromPath(string $path)
         }
     }
 
+    /**
+     * @return string
+     * @throws FileException
+     */
     private function readSourceContentByPath()
     {
         if (!file_exists($this->getSourcePath())) {
diff --git a/src/Processor/Processor.php b/src/Processor/Processor.php
index 9fbdf32..78b5380 100644
--- a/src/Processor/Processor.php
+++ b/src/Processor/Processor.php
@@ -50,7 +50,13 @@ protected function initCompilers()
         $this->compass = new CompassCompiler($this->sass);
     }
 
-    public function attachFiles(string $inputPath, string $outputPath)
+    /**
+     * @param string $inputPath
+     * @param string $outputPath
+     *
+     * @throws \Exception
+     */
+    public function attachFiles($inputPath, $outputPath)
     {
         if (is_dir($inputPath)) {
             $files = scandir($inputPath);
@@ -71,7 +77,10 @@ public function attachFiles(string $inputPath, string $outputPath)
         }
     }
 
-    public function concatOutput() : array
+    /**
+     * @return string[]
+     */
+    public function concatOutput()
     {
         $outputMap = [];
         foreach ($this->files as $file) {
@@ -85,6 +94,9 @@ public function concatOutput() : array
         return $outputMap;
     }
 
+    /**
+     * save output into file
+     */
     public function saveOutput()
     {
         foreach ($this->concatOutput() as $path => $content) {
@@ -100,7 +112,12 @@ public function saveOutput()
         }
     }
 
-    public function processFiles(string $formatter)
+    /**
+     * @param string $formatter
+     *
+     * @throws CompilerException
+     */
+    public function processFiles($formatter)
     {
         switch ($formatter) {
             case 'compressed':
@@ -135,6 +152,7 @@ public function processFiles(string $formatter)
                 case static::TYPE_COMPASS:
                 case static::TYPE_SCSS:
                 case static::TYPE_SASS:
+                    $this->sass->setFormatter($formatter);
                     $content = $this->sass->compile($file->getSourceContent());
                     break;
                 case static::TYPE_LESS: