The main configurations to run npm test with jest

main-configuration-jest-package.json

{
  "_comment": "Many Project INFO goes here...",
  "scripts": {
    "_comment": "Many scripts goes here...",
    
    "test": "jest"
  },
  "dependencies": {
    "_comment": "Many dependencies goes here...",
  },
  "devDependencies": {
    "_comment": "Many dependencies goes here...",
  },
  "jest": {
    "moduleFileExtensions": [
      "js",
      "json",
      "vue"
    ],
    "transform": {
      ".*\\.(vue)$": "<rootDir>/node_modules/vue-jest",
      "^.+\\.js$": "<rootDir>/node_modules/babel-jest"
    },
    "moduleNameMapper": {
      "^@/(.*)$": "<rootDir>/src/$1"
    },
  }
}