jest.json

{
  "testEnvironment": "node",
  "moduleFileExtensions": ["ts", "js", "json"],
  "testRegex": "/tests/.+\\.ts$",
  "transform": {"/tests/.+\\.ts$": "dts-jest/transform"},
  "globals": {
    "_dts_jest_": {
      "tsconfig": {
        "strict": true,
        "target": 5,
        "types": []
      }
    }
  }
}