feat: lint script

Author: karpolan

.eslintignore

@@ -0,0 +1,2 @@
+**/*.test.*
+**/*.spec.*

package.json

@@ -20,11 +20,12 @@
   },
   "scripts": {
     "start": "react-scripts start",
-    "dev": "npm i --force && react-scripts start",
     "build": "react-scripts build",
-    "type": "tsc",
+    "dev": "npm i --force && react-scripts start",
     "format": "prettier ./src --write",
     "format:all": "prettier . --write",
+    "lint": "eslint ./src --ext .js,.ts,.tsx",
+    "type": "tsc",
     "test": "react-scripts test"
   },
   "dependencies": {

src/theme/createEmotionCache.ts

@@ -1,7 +1,15 @@
+import { Theme } from '@mui/material/styles';
 import AppThemeProvider from './AppThemeProvider';
 import DARK_THEME from './dark';
 import LIGHT_THEME from './light';
 
+declare module '@mui/styles/defaultTheme' {
+  // eslint-disable-next-line @typescript-eslint/no-empty-interface
+  interface DefaultTheme extends Theme {
+    // TODO: If you will extend Theme with own properties, also add custom variables here. See https://mui.com/material-ui/customization/theming/#custom-variables
+  }
+}
+
 export {
   LIGHT_THEME as default, // Change to DARK_THEME if you want to use dark theme as default
   DARK_THEME,