.babelrc

{
  "plugins": [
    "@babel/plugin-proposal-class-properties",
    "@babel/plugin-proposal-export-default-from",
    "@babel/plugin-proposal-export-namespace-from",
    [
      "@babel/plugin-proposal-object-rest-spread",
      {
        "useBuiltIns": true
      }
    ],
    "@babel/plugin-transform-strict-mode"
  ],
  "presets": [
    "@babel/preset-flow"
  ],
  "env": {
    "development": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "node": "7.10.1"
            }
          }
        ]
      ]
    },
    "production": {
      "plugins": [
        "@babel/plugin-external-helpers",
        "@babel/plugin-proposal-class-properties"
      ],
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "node": "7.10.1"
            },
            "modules": false
          }
        ]
      ]
    },
    "test": {
      "plugins": [
        "istanbul",
        "@babel/plugin-proposal-class-properties"
      ],
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": {
              "node": "7.10.1"
            }
          }
        ]
      ]
    }
  }
}