babel-jest.js

const babelJest = require('babel-jest');

module.exports = babelJest.createTransformer({
  presets: [
    [
      '@babel/preset-env',
      {
        targets: {
          node: '8',
        },
        useBuiltIns: 'entry',
        corejs: 3,
      },
    ],
  ],
  plugins: ['@babel/plugin-transform-flow-comments'],
});