{ "presets": [ [ "env", { "loose": true, "exclude": ["transform-es2015-typeof-symbol"], "targets": { "browsers": ["last 2 versions", "IE >= 9"] } } ] ], "plugins": [ "transform-class-properties", ["transform-react-jsx", { "pragma": "Omi.h" }], "transform-object-rest-spread", "syntax-dynamic-import" ] }