jest.config.json

{
  "collectCoverageFrom": ["<rootDir>/src/**/*.ts"],
  "coverageDirectory": "<rootDir>/test",
  "globals": {
    "ts-jest": {
      "tsConfig": "<rootDir>/test/tsconfig.test.json"
    }
  },
  "preset": "ts-jest/presets/js-with-ts",
  "rootDir": ".",
  "roots": ["<rootDir>/test", "<rootDir>/src"],
  "setupFilesAfterEnv": ["<rootDir>/test/polyfills.ts"],
  "testEnvironment": "jest-environment-jsdom-fourteen"
}