baazjs/~.babelrc

{
    "presets": [
        "@babel/preset-env",
        "@babel/preset-react",
        "@babel/runtime"
    ],
   
    "plugins": [
        "@babel/plugin-proposal-class-properties",
        "@babel/plugin-proposal-object-rest-spread",
        "@babel/plugin-syntax-dynamic-import",
        "@babel/plugin-syntax-jsx",
        "@babel/plugin-transform-react-jsx",
        ["@babel/plugin-transform-runtime", {
            "corejs": 2
        }]
    ]
}