diff --git a/src/subscriptions.test.ts b/src/subscriptions.test.js
similarity index 80%
rename from src/subscriptions.test.ts
rename to src/subscriptions.test.js
index 682d0bc..eb1d779 100644
--- a/src/subscriptions.test.ts
+++ b/src/subscriptions.test.js
@@ -1,46 +1,50 @@
 import tap from 'tap';
 import Updux from '.';
-import { action, payload } from 'ts-action';
 import u from '@yanick/updeep';
 
+tap.test( 'subscriptions', async() => {
+
 const inc = action('inc');
-const set_double = action('set_double', payload<number>());
+const set_copy = action('set_copy');
 
 const dux = new Updux({
     initial: {
         x: 0,
-        double: 0,
+        copy: 0,
     },
     actions: {
         inc,
     },
-    mutations: [
-        [inc, payload => u({ x: x => x + 1 })],
-        [set_double, double => u({ double })],
-    ],
+    mutations: {
+        inc: payload => u({ x: x => x + 1 }),
+        set_copy: copy => u({ copy }),
+    },
 });
 
 dux.addSubscription(store => (state, unsubscribe) => {
     if (state.x > 2) return unsubscribe();
 
-    store.dispatch(set_double(state.x * 2));
+    store.dispatch(set_copy(state.x));
 });
 
 const store = dux.createStore();
 
 store.dispatch(inc());
 
-tap.same(store.getState(), { x: 1, double: 2 });
+tap.same(store.getState(), { x: 1, copy: 1 });
 
 store.dispatch(inc());
 store.dispatch(inc());
 
-tap.same(store.getState(), { x: 3, double: 4 }, 'we unsubscribed');
+tap.same(store.getState(), { x: 3, copy: 2 }, 'we unsubscribed');
+
+
+} );
 
 tap.test('subduxes subscriptions', async t => {
     const inc_top = action('inc_top');
     const inc_bar = action('inc_bar');
-    const transform_bar = action('transform_bar', payload());
+    const transform_bar = action('transform_bar');
 
     const bar = new Updux({
         initial: 'a',
@@ -79,7 +83,7 @@ tap.test('subduxes subscriptions', async t => {
         ],
         subscriptions: [
             store => {
-                let previous: any;
+                let previous;
                 return ({ count }) => {
                     if (count !== previous) {
                         previous = count;