.babelrc.json

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{
    "presets": [
        [
            "@babel/preset-env",
            {
                "useBuiltIns": "usage",
                "modules": false,
                "corejs": "3",
                "targets": "ie 8",
                "loose": true
            }
        ]
    ],
    "plugins": [
        "@babel/plugin-transform-arrow-functions",
        "@babel/plugin-transform-async-to-generator",
        "@babel/plugin-transform-runtime",
        [
            "@babel/plugin-proposal-private-methods",
            {
                "loose": true
            }
        ],
        [
            "@babel/plugin-proposal-class-properties",
            {
                "loose": true
            }
        ]
    ]
}