.babelrc

{
  "presets": [
    ["@babel/preset-env", {
        "debug": false,
        "loose": false,
        "modules": false,
        "targets": {
          "browsers": [
            "ie >= 11",
            "firefox >= 45",
            "chrome >= 50",
            "edge >= 25",
            "safari >= 10.10",
            "ios >= 9",
            "android >= 5.1"
          ]
        },
        "useBuiltIns": "usage",
        "corejs": { "version": 3, "proposals": true }
    }],
    "@babel/preset-react"
  ],
  "plugins": [
    ["@babel/plugin-transform-runtime", {
      "absoluteRuntime": false,
      "corejs": 3,
      "helpers": true,
      "regenerator": true,
      "useESModules": true
    }],
    "@babel/plugin-syntax-dynamic-import",
    "@babel/plugin-proposal-class-properties",
    "react-hot-loader/babel"
  ]
}

// Plugins run before Presets.
// Plugin ordering is first to last.
// Preset ordering is reversed (last to first).