jest-preprocess.js

// jest-preprocess.js
const babelOptions = {
  presets: [`@babel/react`, `@babel/env`],
  plugins: [
    `@babel/plugin-proposal-optional-chaining`,
    `@babel/plugin-proposal-class-properties`,
  ],
}

module.exports = require(`babel-jest`).createTransformer(babelOptions)