diff --git a/packages/router/package.json b/packages/router/package.json
index 596f277..f21271a 100644
--- a/packages/router/package.json
+++ b/packages/router/package.json
@@ -37,6 +37,10 @@
 		"eslint": "3.2.0",
 		"rimraf": "2.5.4",
 		"rollup-plugin-json": "2.1.0",
+		"rollup-plugin-babel": "^2.7.1",
 		"uglifyjs": "2.4.10"
+	},
+	"dependencies": {
+		"trimkit": "^1.0.2"
 	}
 }
diff --git a/packages/router/rollup.config.js b/packages/router/rollup.config.js
index 02d2d72..387f893 100644
--- a/packages/router/rollup.config.js
+++ b/packages/router/rollup.config.js
@@ -1,6 +1,15 @@
 import json from 'rollup-plugin-json';
 import babel from 'rollup-plugin-babel';
 
+const babelConfig = {
+	env: {
+		es6: true,
+		browser: true
+	},
+	plugins: [],
+	presets: ['stage-0', 'es2015-rollup']
+};
+
 export default {
 	entry: 'src/index.js',
 	format: 'umd',
diff --git a/packages/router/src/index.js b/packages/router/src/index.js
index f09571f..bc998a2 100644
--- a/packages/router/src/index.js
+++ b/packages/router/src/index.js
@@ -2,11 +2,7 @@ import { isFunction, isUndefined, Null, ObjectKeys } from 'trimkit';
 
 function nop() {}
 
-export function Router(
-	baseUrl: string,
-	routes: RouteSpecType,
-	unmatched: UnmatchedFunctionType
-): RouterApiType {
+export function Router(baseUrl, routes, unmatched) {
 	let listening = false;
 	let currentRoute = Null;
 	let reEnterHook = Null;
@@ -29,7 +25,7 @@ export function Router(
 		};
 	});
 
-	function goto(urlOrName: string, vars?: RouteVarsType) {
+	function goto(urlOrName, vars) {
 		const url = urlOrName.startsWith(baseUrl) ? urlOrName : href(urlOrName, vars);
 
 		if (listening && _location() !== url) {
@@ -89,7 +85,7 @@ export function Router(
 		}
 	}
 
-	function href(routeName: string, vars: RouteVarsType = {}): string {
+	function href(routeName, vars) {
 		const route = routes[routeName];
 		if (!route) {
 			throw new Error(`Invalid route ${routeName}.`);
@@ -111,11 +107,11 @@ export function Router(
 		return `${baseUrl}${path}`;
 	}
 
-	function _location(): string {
+	function _location() {
 		return location.hash;
 	}
 
-	function listen(initialRoute: string): void {
+	function listen(initialRoute) {
 		if (listening) {
 			return;
 		}
@@ -125,7 +121,7 @@ export function Router(
 		goto(_location() || initialRoute);
 	}
 
-	function current(): RouteInfoType | null {
+	function current() {
 		return currentRoute;
 	}