.babelrc

{
  "presets": [
    ["@babel/env", { "modules": false, "loose": true }],
    "@babel/flow",
    "@babel/react"
  ],
  "env": {
    "esm": {
      "ignore": ["**/*.test.js", "**/__mocks__/**"]
    },
    "cjs": {
      "plugins": [["@babel/transform-modules-commonjs"]],
      "ignore": ["**/*.test.js", "**/__mocks__/**"]
    },
    "test": {
      "plugins": ["@babel/transform-modules-commonjs"]
    }
  }
}