Jest + Enzyme + Typescript (based on parcel)

init.txt

1) npm i jest --save-dev
2) npm i @types/jest ts-jest —save-dev
3) create jest.config.js
---------------------------
  module.exports = {
    "roots": [
      "<rootDir>/src"
    ],
    "transform": {
      "^.+\\.tsx?$": "ts-jest"
    },
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ],
    "snapshotSerializers": ["enzyme-to-json/serializer"],
  }
  ---------------------
4) npm i enzyme @types/enzyme enzyme-to-json enzyme-adapter-react-16 —save-dev
5) in jest.config.js -> "snapshotSerializers": ["enzyme-to-json/serializer"]

Article - https://thetrevorharmon.com/blog/configuring-jest-and-enzyme-in-create-react-app-on-typescript