[#1] add: eslintrc file

.eslintrc

@@ -0,0 +1,39 @@
+{
+  "extends": [
+    "prettier",
+    "airbnb",
+    "airbnb/hooks",
+    "prettier/react",
+    "plugin:@typescript-eslint/recommended",
+    "prettier/@typescript-eslint",
+    "plugin:prettier/recommended"
+  ],
+  "parser": "@typescript-eslint/parser",
+  "settings": {
+    "import/resolver": {
+      "node": {
+        "extensions": [".js", ".jsx", ".ts", ".tsx"]
+      }
+    }
+  },
+  "plugins": ["@typescript-eslint"],
+  "rules": {
+    "indent": ["error", 2],
+    "import/extensions": [
+      "error",
+      "ignorePackages",
+      {
+        "js": "never",
+        "jsx": "never",
+        "ts": "never",
+        "tsx": "never",
+        "json": "never"
+      }
+    ],
+    "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "no-use-before-define": "off",
+    "import/no-unresolved": "off",
+    "react/jsx-filename-extension": [1, { "extensions": [".tsx", ".ts"] }]
+  }
+}

src/components/App.tsx

@@ -1,6 +1,6 @@
-import GreetingPage from 'pages/GreetingPage';
-import { Route, Switch } from 'react-router-dom';
-import GlobalStyle from 'styles/GlobalStyle';
+import GreetingPage from "pages/GreetingPage";
+import { Route, Switch } from "react-router-dom";
+import GlobalStyle from "styles/GlobalStyle";
 
 const App = () => {
   return (

tsconfig.json

@@ -15,7 +15,7 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "noEmit": true,
-    "jsx": "react-jsx"
+    "jsx": "react"
   },
   "include": ["src"]
 }