{
    "presets": [
        [
            "@babel/preset-env",
            {
                "targets": {
                    "chrome": "56",
                    "firefox": "59"
                },
                "useBuiltIns": "entry",
                "corejs": 3
            }
        ]
    ],
    "plugins": [
        "@babel/plugin-proposal-class-properties"
    ]
}