update package.json

packages/slack/package.json

@@ -22,6 +22,7 @@
     "@types/jest": "^26.0.22",
     "@typescript-eslint/eslint-plugin": "^4.18.0",
     "@typescript-eslint/parser": "^4.18.0",
+    "cross-env": "^7.0.0",
     "eslint-import-resolver-typescript": "^2.4.0",
     "eslint-plugin-jest": "^24.3.2",
     "ts-jest": "^26.5.4",

packages/slackbot-proxy/package.json

@@ -27,6 +27,7 @@
     "@tsed/typeorm": "^6.43.0",
     "compression": "^1.7.4",
     "cookie-parser": "^1.4.5",
+    "cross-env": "^7.0.0",
     "dotenv-flow": "^3.2.0",
     "method-override": "^3.0.0",
     "mysql2": "^2.2.5",