.babelrc

{
  "env": {
    "development": {
      "presets": [
        "flow",
        [
         "env",
          {
            "target": {
              "chrome": "62"
            }, 
            "loose": true,
            "modules": false
          }
        ],
        "react",
        "stage-2"
      ],
      "plugins": [
        "transform-runtime",
        "react-hot-loader/babel",
        ["transform-es2015-modules-commonjs", {
            "strict" : false
        }]
      ]
    },
    "production": {
      "presets": [
        "flow",
        [
          "env",
          {
            "target": {
              "chrome": "62"
            }, 
            "loose": true,
            "modules": false
          }
        ],
        "react",
        "stage-2",
        "react-optimize"
      ],
      "plugins": [
        "lodash",
        "transform-runtime",
        ["transform-es2015-modules-commonjs", {
            "strict" : false
        }]
      ]
    },
    "test": {
      "presets": [
        "flow",
        [
         "env",
          {
            "target": {
              "chrome": "56"
            }, 
            "loose": true,
            "modules": false
          }
        ],
        "react",
        "stage-2"
      ],
      "plugins": [
        "transform-runtime",
        ["transform-es2015-modules-commonjs", {
            "strict" : false
        }]
      ]
    }
  }
}