.babelrc

{
    "presets": [
        [
            "@babel/preset-env",
            {
                "modules": false
            }
        ],
        "@babel/preset-react",
        "@babel/preset-typescript"
    ],
    "plugins": [
        ["@babel/plugin-syntax-dynamic-import"],
        ["@babel/plugin-proposal-class-properties", { "loose": false }]
    ],
    "env": {
        "test": {
            "presets": [
                [
                    "@babel/preset-env",
                    {
                        "targets": {
                            "node": "current"
                        }
                    }
                ],
                "@babel/preset-react",
                "@babel/preset-typescript"
            ],
            "plugins": [
                ["@babel/plugin-proposal-decorators", { "legacy": true }],
                ["@babel/plugin-proposal-class-properties", { "loose": true }],
                "istanbul"
            ]
        }
    }
}