[REF] store: typecheck code

closes #87
closes #39

tests/component.test.ts

@@ -1646,7 +1646,7 @@ describe("async rendering", () => {
     );
   });
 
-  test.only("properly behave when destroyed/unmounted while rendering ", async () => {
+  test("properly behave when destroyed/unmounted while rendering ", async () => {
     let def = Promise.resolve();
 
     class Child extends Widget {

tests/store.test.ts

@@ -141,7 +141,7 @@ describe("basic use", () => {
 
   test("env is given to actions", () => {
     expect.assertions(1);
-    const someEnv = {};
+    const someEnv = <Env>{};
     const actions = {
       someaction({ env }) {
         expect(env).toBe(someEnv);