{
  "plugins": [
    "proposal-class-properties",
    "external-helpers",
    "syntax-flow",
    "transform-es2015-parameters",
    "transform-es2015-block-scoping",
    "transform-es2015-spread",
    "transform-es2015-classes",
    "transform-es2015-destructuring",
    "transform-es2015-arrow-functions",
    "transform-es2015-for-of"
  ]
}