compilation errors in tests with latest mongoose version

[blumamir]

The mongoose dependencies are set in package.json as

  "devDependencies": {
    ....
    "@types/mongoose": "^5.7.8",
    "mongoose": "^5.9.7",
    ....
  }

On my setup it, using yarn and the latest versions of the packages, it installs:

    "name": "@types/mongoose",
    "version": "5.10.3",

and

  "name": "mongoose",
  "version": "5.11.7",

which fails yarn test due to many compilation errors.