⬆️ chore: upgrade devDependencies & fix linter warnings

Author: guanghechen

Diff for: package.json

@@ -39,35 +39,35 @@
     "packages/*"
   ],
   "devDependencies": {
-    "@babel/core": "7.15.0",
-    "@babel/eslint-parser": "7.15.0",
+    "@babel/core": "7.15.5",
+    "@babel/eslint-parser": "7.15.7",
     "@guanghechen/eslint-config": "^1.8.3",
     "@guanghechen/eslint-config-ts": "^1.8.3",
     "@guanghechen/jest-config": "^1.8.3",
     "@guanghechen/rollup-config": "^1.8.3",
     "@types/fs-extra": "^9.0.8",
     "@types/jest": "27.0.1",
-    "@types/node": "16.7.1",
+    "@types/node": "16.9.4",
     "cross-env": "7.0.3",
     "eslint": "7.32.0",
     "eslint-config-prettier": "8.3.0",
-    "eslint-plugin-jest": "24.4.0",
-    "eslint-plugin-prettier": "3.4.1",
+    "eslint-plugin-jest": "24.4.2",
+    "eslint-plugin-prettier": "4.0.0",
     "fs-extra": "^10.0.0",
     "gitmoji-changelog": "2.2.1",
-    "husky": "7.0.1",
+    "husky": "7.0.2",
     "is-ci": "3.0.0",
-    "jest": "27.0.6",
+    "jest": "27.2.1",
     "lerna": "4.0.0",
     "lint-staged": "11.1.2",
     "npm-run-all": "4.1.5",
     "pinst": "2.1.6",
-    "prettier": "2.3.2",
+    "prettier": "2.4.1",
     "rimraf": "3.0.2",
     "rollup": "2.56.3",
     "ts-jest": "27.0.5",
     "ts-node": "10.2.1",
-    "tsconfig-paths": "3.10.1",
+    "tsconfig-paths": "3.11.0",
     "typescript": "4.3.5",
     "yarn-deduplicate": "3.1.0"
   },

Diff for: packages/mcmf/__test__/codeforce.spec.ts

@@ -31,7 +31,7 @@ describe('codeforces', function () {
           mcmf.addEdge(x, v, Number.MAX_SAFE_INTEGER, 1)
         }
 
-        const [mincost, maxflow] = mcmf.minCostMaxFlow()
+        const [, maxflow] = mcmf.minCostMaxFlow()
         answer -= maxflow
         return answer
       }