{ "presets": [ "@babel/preset-env", "@babel/preset-react", "@babel/preset-typescript" ], "plugins": [ "@babel/plugin-proposal-class-properties" ], "env": { "development": { "plugins": [ "react-element-info" ], }, "test": { "plugins": [ "react-element-info", "@babel/plugin-transform-runtime", ["polyfill-corejs3", { "method": "usage-global" }] ], "presets": [ "@babel/preset-env", "@babel/preset-react" ] } } }