{ "presets": [["@babel/env"]], "plugins": [ [ "@babel/plugin-proposal-class-properties", { "loose": true } ], [ "@babel/plugin-proposal-private-property-in-object", { "loose": true } ], [ "@babel/plugin-proposal-private-methods", { "loose": true } ], ["@babel/plugin-transform-arrow-functions"], ["@babel/plugin-transform-object-assign"] ] }