From bce2d5098cfe05a4fadad1b742042ebb4e6b84cb Mon Sep 17 00:00:00 2001
From: jero <aneurysmjs@outlook.com>
Date: Thu, 17 Oct 2019 23:37:54 +0300
Subject: [PATCH] feat(alienstore): add useAlienModule hook

import dynamically a Redux module and inject its reducers

improves #43
---
 .../config/alienStore/alienStore.test.tsx     | 33 ++++++++++++++++++-
 .../store/config/alienStore/alienStore.tsx    | 24 +++++++++++++-
 src/app/store/config/alienStore/index.tsx     |  1 +
 3 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/src/app/store/config/alienStore/alienStore.test.tsx b/src/app/store/config/alienStore/alienStore.test.tsx
index 1735b0e1..e32208ed 100644
--- a/src/app/store/config/alienStore/alienStore.test.tsx
+++ b/src/app/store/config/alienStore/alienStore.test.tsx
@@ -1,11 +1,13 @@
 /* eslint-disable @typescript-eslint/ban-ts-ignore, import/no-named-as-default-member */
 import React, { ReactElement } from 'react';
-import { createStore as createReduxStore } from 'redux';
+import { renderHook, act, RenderHookResult } from '@testing-library/react-hooks';
+import { createStore as createReduxStore, AnyAction } from 'redux';
 import alienStore, {
   createStore,
   reloadStore,
   injectReducers,
   withStoreModule,
+  useAlienModule,
 } from './alienStore';
 
 describe('Dyno Store', () => {
@@ -14,6 +16,7 @@ describe('Dyno Store', () => {
     expect(alienStore).toHaveProperty('reloadStore');
     expect(alienStore).toHaveProperty('injectReducers');
     expect(alienStore).toHaveProperty('withStoreModule');
+    expect(alienStore).toHaveProperty('useAlienModule');
   });
 
   it('should create and return a Redux store', () => {
@@ -81,4 +84,32 @@ describe('Dyno Store', () => {
       });
     });
   });
+
+  describe('test "useAlienModule"', () => {
+    const alienModuleMock = {
+      actions: {
+        dummyAction: (): AnyAction => ({
+          type: 'DUMMY_ACTION',
+          payload: {
+            name: 'Джеро',
+          },
+        }),
+      },
+    };
+
+    type AlienModuleType = Promise<{ default: typeof alienModuleMock }>;
+
+    const importAlienModule = (): AlienModuleType => Promise.resolve({ default: alienModuleMock });
+    it('should render "null" at first', async () => {
+      const store = createStore();
+      const mockDispatch = jest.spyOn(store, 'dispatch');
+      let hookRenderer = {} as RenderHookResult<{}, AlienModuleType>;
+      await act(async () => {
+        hookRenderer = renderHook(() => useAlienModule(importAlienModule));
+      });
+      expect(mockDispatch).toHaveBeenCalledTimes(1);
+      expect(mockDispatch).toHaveBeenCalledWith({ type: '@@ALIEN_STORE/RELOAD' });
+      expect(hookRenderer.result.current).toEqual({ default: alienModuleMock });
+    });
+  });
 });
diff --git a/src/app/store/config/alienStore/alienStore.tsx b/src/app/store/config/alienStore/alienStore.tsx
index 214280bd..398bd1dd 100644
--- a/src/app/store/config/alienStore/alienStore.tsx
+++ b/src/app/store/config/alienStore/alienStore.tsx
@@ -1,4 +1,4 @@
-import { ComponentType } from 'react';
+import { ComponentType, useEffect, useState } from 'react';
 import {
   createStore as createReduxStore,
   combineReducers,
@@ -47,9 +47,31 @@ export async function withStoreModule<P>(
   }
 }
 
+type UseAlienModuleImportType<P> = () => Promise<{ default: P } | P>;
+
+export function useAlienModule<P>(moduleStore: UseAlienModuleImportType<P>): P | null {
+  const [alienModule, setAlienModule] = useState<P | null>(null);
+
+  useEffect(() => {
+    (async (): Promise<void> => {
+      try {
+        const module = await moduleStore();
+        injectReducers(module.reducers);
+        setAlienModule(module);
+      } catch (err) {
+        throw new Error(`useDyno error: ${err}`);
+      }
+    })();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  return alienModule;
+}
+
 export default {
   createStore,
   reloadStore,
   injectReducers,
   withStoreModule,
+  useAlienModule,
 };
diff --git a/src/app/store/config/alienStore/index.tsx b/src/app/store/config/alienStore/index.tsx
index 07893608..8b1f7026 100644
--- a/src/app/store/config/alienStore/index.tsx
+++ b/src/app/store/config/alienStore/index.tsx
@@ -2,5 +2,6 @@ export { createStore } from './alienStore';
 export { reloadStore } from './alienStore';
 export { injectReducers } from './alienStore';
 export { withStoreModule } from './alienStore';
+export { useAlienModule } from './alienStore';
 
 export { default } from './alienStore';