fix(rewriter): Get rewriter via a callback instead of through options to avoid serialization.

Author: chriseppstein

packages/jsx-analyzer/src/transformer/webpackLoader.ts

@@ -32,7 +32,7 @@ export default function CSSBlocksWebpackAdapter(this: any, source: any, map: any
     options = loaderUtils.getOptions(this);
   }
 
-  let rewriter = options.rewriter;
+  let rewriter = options.getRewriter();
   rewriter.blocks = (rewriter.blocks || {});
 
   this.dependency(path);