{ "presets": [ [ "@babel/preset-env", { "debug": false, "useBuiltIns": false, "targets": { "browsers": [ "last 1 Chrome versions", "last 1 Edge versions", "last 1 Firefox versions", "last 1 Safari versions" ] } } ], [ "@babel/preset-react", { "development": true, "useSpread": true } ] ], "plugins": [ "@babel/plugin-syntax-dynamic-import", "react-hot-loader/babel", [ "@babel/plugin-proposal-class-properties", { "loose": true } ] ] }