scratch-desktop/.babelrc

{
    "presets": [
        ["@babel/preset-env", {
            "targets": {
                "browsers": [
                    "node >= 16", // Electron's main process
                    "chrome >= 63" // Electron's render process (see Scratch FAQ)
                ]
            }
        }],
        "@babel/preset-react"
    ]
}