crc32 needsCompile check for serialized registeredVars

src/Compiler.php

@@ -2701,6 +2701,18 @@ public function unsetVariable($name)
         unset($this->registeredVars[$name]);
     }
 
+    /**
+     * Returns list of variables
+     *
+     * @api
+     *
+     * @return array
+     */
+    public function getVariables()
+    {
+        return $this->registeredVars;
+    }
+
     /**
      * Adds to list of parsed files
      *

src/Server.php

@@ -143,6 +143,11 @@ protected function needsCompile($in, $out, &$etag)
                     return true;
                 }
             }
+
+            $metaVars = crc32(serialize($this->scss->getVariables()));
+            if ($metaVars!=$metadata['vars']) {
+                return true;
+            }
 
             $etag = $metadata['etag'];
 
@@ -213,6 +218,7 @@ protected function compile($in, $out)
             serialize(array(
                 'etag'    => $etag,
                 'imports' => $this->scss->getParsedFiles(),
+                'vars' => crc32(serialize($this->scss->getVariables())),
             ))
         );