Jest

• Setup
  • Using Babel

Setup

Install

npm install --save-dev

For Typescript, install types

npm i @types/jest -D //? not sure

Init configuration file

npm init jest@latest

You will be asked if you want to use babel, needed to use esm

Using Babel

npm install --save-dev babel-jest @babel/core @babel/preset-env

Configure Babel to target your current version of Node by creating a babel.config.js file in the root of your project:

babel.config.cjs must use .cjs extension

module.exports = {
  presets: [['@babel/preset-env', {targets: {node: 'current'}}]],
};