💥 yarn upgrade --latest

about `"noFallthroughCasesInSwitch": true`:

facebook/create-react-app#9429

package.json

@@ -3,17 +3,17 @@
   "version": "0.1.0",
   "private": true,
   "dependencies": {
-    "@testing-library/jest-dom": "^4.2.4",
-    "@testing-library/react": "^9.3.2",
-    "@testing-library/user-event": "^7.1.2",
-    "@types/jest": "^24.0.0",
-    "@types/node": "^12.0.0",
+    "@testing-library/jest-dom": "^5.11.5",
+    "@testing-library/react": "^11.1.0",
+    "@testing-library/user-event": "^12.1.10",
+    "@types/jest": "^26.0.15",
+    "@types/node": "^14.14.2",
     "@types/react": "^16.9.0",
     "@types/react-dom": "^16.9.0",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
-    "react-scripts": "3.4.4",
-    "typescript": "~3.7.2"
+    "react-scripts": "4.0.0",
+    "typescript": "~4.0.3"
   },
   "scripts": {
     "start": "react-scripts start",

tsconfig.json

@@ -17,7 +17,8 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "noEmit": true,
-    "jsx": "react"
+    "jsx": "react",
+    "noFallthroughCasesInSwitch": true
   },
   "include": [
     "src"