silverstripe-webpack/babel.config.json

{
    "presets": [
        [
            "@babel/preset-env",
            {
                "targets": {
                    "node": "6.10",
                    "esmodules": true
                }
            }
        ],
        [
            "@babel/preset-react",
            {
                "pragma": "dom", // default pragma is React.createElement (only in classic runtime)
                "pragmaFrag": "DomFrag", // default is React.Fragment (only in classic runtime)
                "throwIfNamespace": false, // defaults to true
                "runtime": "classic" // defaults to classic
                // "importSource": "custom-jsx-library" // defaults to react (only in automatic runtime)
            }
        ]
    ],
    "plugins": [
        "@babel/plugin-syntax-top-level-await",
        "@babel/plugin-proposal-object-rest-spread",
        "@babel/plugin-syntax-jsx"
    ]
}