electron dev tools is added

main/src/index.ts

@@ -71,6 +71,28 @@ if (isDuplicateInstance) {
 function createWindow() {
   const window = new AppWindow();
 
+  if (__DEV__) {
+    const {
+      default: installExtension,
+      REDUX_DEVTOOLS
+    } = require('electron-devtools-installer');
+
+    require('electron-debug')({ showDevTools: true });
+
+    const ChromeLens = {
+      id: 'idikgljglpfilbhaboonnpnnincjhjkd',
+      electron: '>=1.2.1'
+    };
+
+    const extensions = [REDUX_DEVTOOLS, ChromeLens];
+
+    for (const extension of extensions) {
+      try {
+        installExtension(extension);
+      } catch (e) {}
+    }
+  }
+
   window.onClose(() => {
     appWindow = null;
     if (!__DARWIN__ && !preventQuit) {