.babelrc

{
    "plugins": [
        "@babel/plugin-transform-runtime",
        ["@babel/plugin-proposal-class-properties", { "loose": true }],
        "@babel/plugin-proposal-do-expressions",
        "@babel/plugin-proposal-function-bind",
        "@babel/plugin-proposal-export-namespace-from",
        "@babel/plugin-proposal-export-default-from",
        "@babel/plugin-proposal-object-rest-spread",
        "@babel/plugin-transform-flow-strip-types",
        "@babel/plugin-proposal-optional-chaining",
        ["babel-plugin-root-import", {
            "rootPathPrefix": "@",
            "rootPathSuffix": "node_modules/llir/lib/"
        }],
        ["babel-plugin-transform-builtin-extend", {
            "globals": ["Error"]
        }],
        "babel-plugin-wildcard",
        "@babel/plugin-proposal-unicode-property-regex"
    ],
    "presets": [
        "@babel/preset-react",
        ["@babel/preset-env", {
            "targets": {
                "node": "6.11"
            },
            "useBuiltIns": "usage",
            "corejs": 3,
            "include": ["proposal-object-rest-spread"]
        }]
    ],
    "env": {
        "test": {
            "plugins": [
                "istanbul"
            ]
        }
    }
}