diff --git a/deno.json b/deno.json
index c0102b1..20501cd 100755
--- a/deno.json
+++ b/deno.json
@@ -1,7 +1,7 @@
 {
   "name": "@bearmetal/router",
   "description": "A simple router for Deno",
-  "version": "0.2.3-a",
+  "version": "0.2.3-b",
   "stable": true,
   "files": [
     "mod.ts",
diff --git a/file_router.ts b/file_router.ts
index e20b723..e605e36 100755
--- a/file_router.ts
+++ b/file_router.ts
@@ -25,7 +25,7 @@ function crawl(dir: string, callback: (path: string) => void) {
  * ```
  */
 export class FileRouter extends Router {
-  constructor(root: string) {
+  constructor(root: string, _import?: (path: string) => Promise<unknown>) {
     super();
     crawl(root, async (path) => {
       let relativePath = path.replace(root, "").replace(/index\/?/, "");
@@ -36,7 +36,9 @@ export class FileRouter extends Router {
             : `${Deno.cwd()}/${path.replace(/^.?.?\//, "")}`;
         }
         relativePath = relativePath.replace(/\.[tj]s/, "");
-        const handlers = await import("file://" + path);
+        const handlers = _import
+          ? await _import(path)
+          : await import("file://" + path);
 
         if (handlers.default) {
           handlers.default instanceof Router