.babelrc

{
  "env": {
    "development": {
      "plugins": [
        "react-hot-loader/babel",
        "emotion",
        "syntax-jsx",
        "syntax-trailing-function-commas",
        "transform-flow-strip-types",

        // React
        "transform-react-jsx-self",
        "transform-react-jsx-source",
        "transform-react-display-name",
        ["transform-react-jsx", { "useBuiltIns": true }],

        // Stage 2
        "syntax-dynamic-import",
        ["transform-class-properties", { "spec": false }],

        // Stage 3
        ["transform-object-rest-spread", { "useBuiltIns": true }],

        // ES2015 -- Move this to production-only when browsers add support for class properties (see above)
        ["transform-es2015-classes", { "loose": true }]
      ]
    },
    "production": {
      "presets": [
        [
          "env",
          {
            "spec": false,
            "loose": true,
            "modules": false,
            "forceAllTransforms": true,
            "debug": false,
            "useBuiltIns": "entry",
            "targets": {
              "browsers": ["> 1%", "ie >= 10", "not ie < 10"]
            },
            "exclude": [
              "transform-es2015-sticky-regex",
              "transform-es2015-unicode-regex",
              "es6.reflect.apply",
              "es6.reflect.construct",
              "es6.reflect.define-property",
              "es6.reflect.delete-property",
              "es6.reflect.get",
              "es6.reflect.get-own-property-descriptor",
              "es6.reflect.get-prototype-of",
              "es6.reflect.has",
              "es6.reflect.is-extensible",
              "es6.reflect.own-keys",
              "es6.reflect.prevent-extensions",
              "es6.reflect.set",
              "es6.reflect.set-prototype-of",
              "es6.math.acosh",
              "es6.math.asinh",
              "es6.math.atanh",
              "es6.math.cbrt",
              "es6.math.clz32",
              "es6.math.cosh",
              "es6.math.expm1",
              "es6.math.fround",
              "es6.math.hypot",
              "es6.math.imul",
              "es6.math.log10",
              "es6.math.log1p",
              "es6.math.log2",
              "es6.math.sign",
              "es6.math.sinh",
              "es6.math.tanh",
              "es6.math.trunc"
            ]
          }
        ]
      ],
      "plugins": [
        "emotion",
        "syntax-jsx",
        "syntax-trailing-function-commas",
        "transform-flow-strip-types",

        // React
        "transform-react-constant-elements",
        "transform-react-inline-elements",
        "transform-react-remove-prop-types",
        ["transform-react-jsx", { "useBuiltIns": true }],

        // Stage 2
        "syntax-dynamic-import",
        ["transform-class-properties", { "spec": false }],

        // Stage 3
        ["transform-object-rest-spread", { "useBuiltIns": true }],
        "transform-async-generator-functions",

        // Parameter destructuring breaks if we don't require this
        "transform-es2015-parameters"
      ]
    }
  }
}