fix

package.json

@@ -66,7 +66,7 @@
     "egg-mock": "^3.16.0",
     "eslint": "^6.7.2",
     "eslint-config-egg": "^8.0.0",
-    "tslib": "^2.0.1",
+    "tslib": "^1.9.0",
     "typescript": "^3.0.0",
     "webstorm-disable-index": "^1.2.0"
   },