diff --git a/sample/package-lock.json b/sample/package-lock.json
index 05b2b3e..7ba46e4 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",
@@ -3753,8 +3754,9 @@
       }
     },
     "node_modules/async": {
-      "version": "2.6.3",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "dependencies": {
         "lodash": "^4.17.14"
       }
@@ -7626,6 +7628,14 @@
       "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==",
@@ -21750,8 +21760,9 @@
       "integrity": "sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ=="
     },
     "async": {
-      "version": "2.6.3",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "requires": {
         "lodash": "^4.17.14"
       }
@@ -24808,6 +24819,12 @@
         }
       }
     },
+    "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==",