{ "presets": [ ["env", { "modules": false, "targets": { "browsers": [ "last 3 Chrome versions", "last 3 Firefox versions", "last 3 Safari versions", "last 3 Edge versions", "IE 11" ] }, "useBuiltIns": true }], "react" ], "plugins": [ "transform-class-properties", ["transform-object-rest-spread", { // use built-in `Object.assign` "useBuiltIns": true }] ], "env": { "production": { "plugins": [ "syntax-dynamic-import", "transform-react-constant-elements" ] }, "development": { "plugins": [ "syntax-dynamic-import", "transform-react-jsx-source", "transform-react-jsx-self" ] }, "test": { "plugins": [ "transform-es2015-modules-commonjs", "dynamic-import-node", "transform-react-jsx-source", "transform-react-jsx-self" ] } }, "ignore": [ "**/libs/**" ] }