diff --git a/sample/package-lock.json b/sample/package-lock.json
index 05b2b3e..86a3470 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==",
@@ -17868,8 +17877,9 @@
       }
     },
     "node_modules/url-parse": {
-      "version": "1.5.3",
-      "integrity": "sha512-IIORyIQD9rvj0A4CLWsHkBBJuNqWpFQe224b6j9t/ABmquIS0qDU2pY6kl6AuOrL5OkCXHMCFNe1jBcuAggjvQ==",
+      "version": "1.5.10",
+      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.5.10.tgz",
+      "integrity": "sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==",
       "dependencies": {
         "querystringify": "^2.1.1",
         "requires-port": "^1.0.0"
@@ -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==",
@@ -32504,8 +32520,9 @@
       }
     },
     "url-parse": {
-      "version": "1.5.3",
-      "integrity": "sha512-IIORyIQD9rvj0A4CLWsHkBBJuNqWpFQe224b6j9t/ABmquIS0qDU2pY6kl6AuOrL5OkCXHMCFNe1jBcuAggjvQ==",
+      "version": "1.5.10",
+      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.5.10.tgz",
+      "integrity": "sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==",
       "requires": {
         "querystringify": "^2.1.1",
         "requires-port": "^1.0.0"