{ "presets": [ "react", ["env",{ "targets": { "browsers": [ "last 5 versions", "FireFox >= 44", "Safari >= 7", "Explorer 11", "last 4 Edge versions" ], "loose": true } }], "stage-2", "stage-3" ], "plugins": [ "react-hot-loader/babel", "transform-runtime", "transform-object-rest-spread", "transform-decorators-legacy" ], "env": { "development": { "presets": ["flow"], "plugins": [ "flow-runtime" ] } } }