add more complete eslint configuration

.eslintrc.json

@@ -1,3 +1,14 @@
 {
-  "extends": "next/core-web-vitals"
+  "extends": [
+    "next/core-web-vitals",
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+  ],
+  "plugins": ["@typescript-eslint", "prettier", "simple-import-sort"],
+  "parser": "@typescript-eslint/parser",
+  "rules": {
+    "simple-import-sort/imports": "warn",
+    "simple-import-sort/exports": "warn"
+  }
 }

.github/workflows/tests.yml

@@ -16,5 +16,8 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Lint
+        run: npm run lint
+
       - name: Test
         run: npm test

.prettierrc

@@ -0,0 +1 @@
+{}

jest.config.js

@@ -1,3 +1,4 @@
+// eslint-disable-next-line @typescript-eslint/no-var-requires
 const nextJest = require("next/jest");
 
 const createJestConfig = nextJest({