diff --git a/sample/package-lock.json b/sample/package-lock.json
index 05b2b3e..75bba9e 100644
--- a/sample/package-lock.json
+++ b/sample/package-lock.json
@@ -14,6 +14,7 @@
         "@testing-library/jest-dom": "^5.14.1",
         "@testing-library/react": "^12.1.2",
         "@testing-library/user-event": "^13.5.0",
+        "eslint-plugin-mui-unused-classes": "^1.0.3",
         "npm-check-updates": "^11.8.5",
         "react": "^17.0.2",
         "react-dom": "^17.0.2",
@@ -7626,6 +7627,14 @@
       "version": "9.2.2",
       "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg=="
     },
+    "node_modules/eslint-plugin-mui-unused-classes": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-mui-unused-classes/-/eslint-plugin-mui-unused-classes-1.0.3.tgz",
+      "integrity": "sha512-hsvoxxcL189LSyUyBvak+tK7XHKvoAiUBQpnCRyx6hLf4FTE+WWNtE9cRwcUwZvdh+E/wLHGp9JpNveQcQpUTw==",
+      "peerDependencies": {
+        "eslint": "^7.14.0"
+      }
+    },
     "node_modules/eslint-plugin-react": {
       "version": "7.24.0",
       "integrity": "sha512-KJJIx2SYx7PBx3ONe/mEeMz4YE0Lcr7feJTCMyyKb/341NcjuAgim3Acgan89GfPv7nxXK2+0slu0CWXYM4x+Q==",
@@ -8453,8 +8462,9 @@
       }
     },
     "node_modules/follow-redirects": {
-      "version": "1.14.2",
-      "integrity": "sha512-yLR6WaE2lbF0x4K2qE2p9PEXKLDjUjnR/xmjS3wHAYxtlsI9MLLBJUZirAHKzUZDGLxje7w/cXR49WOUo4rbsA==",
+      "version": "1.14.8",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.14.8.tgz",
+      "integrity": "sha512-1x0S9UVJHsQprFcEC/qnNzBLcIxsjAV905f/UkQxbclCsoTWlacCNOpQa/anodLl2uaEKFhfWOvM2Qg77+15zA==",
       "funding": [
         {
           "type": "individual",
@@ -24808,6 +24818,12 @@
         }
       }
     },
+    "eslint-plugin-mui-unused-classes": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-mui-unused-classes/-/eslint-plugin-mui-unused-classes-1.0.3.tgz",
+      "integrity": "sha512-hsvoxxcL189LSyUyBvak+tK7XHKvoAiUBQpnCRyx6hLf4FTE+WWNtE9cRwcUwZvdh+E/wLHGp9JpNveQcQpUTw==",
+      "requires": {}
+    },
     "eslint-plugin-react": {
       "version": "7.24.0",
       "integrity": "sha512-KJJIx2SYx7PBx3ONe/mEeMz4YE0Lcr7feJTCMyyKb/341NcjuAgim3Acgan89GfPv7nxXK2+0slu0CWXYM4x+Q==",
@@ -25386,8 +25402,9 @@
       }
     },
     "follow-redirects": {
-      "version": "1.14.2",
-      "integrity": "sha512-yLR6WaE2lbF0x4K2qE2p9PEXKLDjUjnR/xmjS3wHAYxtlsI9MLLBJUZirAHKzUZDGLxje7w/cXR49WOUo4rbsA=="
+      "version": "1.14.8",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.14.8.tgz",
+      "integrity": "sha512-1x0S9UVJHsQprFcEC/qnNzBLcIxsjAV905f/UkQxbclCsoTWlacCNOpQa/anodLl2uaEKFhfWOvM2Qg77+15zA=="
     },
     "for-in": {
       "version": "1.0.2",