.babelrc

{
    "env": {
        "commonjs": {
            "presets": [
                ["env", {
                    "targets": {
                        "browsers": ["last 1 versions", "ie >= 10"]
                    },
                    "modules": "commonjs",
                    "loose": true,
                    "useBuiltIns": true
                }]
            ],
            "plugins": [
                "transform-export-extensions",
                "transform-class-properties",
                "transform-object-rest-spread",
                "transform-remove-strict-mode"
            ]
        },
        "test": {
            "plugins": [
                ["istanbul", {
                    "exclude": [
                        "**/node_modules/**",
                        "**/packages/**",
                        "**/test/**",
                        "**/Test*"
                    ]
                }],
                "transform-export-extensions",
                "transform-class-properties",
                "transform-object-rest-spread",
                "transform-remove-strict-mode"
            ]
        }
    },
    "presets": [
        ["env", {
            "targets": {
                "browsers": ["last 1 versions", "ie >= 10"]
            },
            "modules": false,
            "loose": true,
            "useBuiltIns": true
        }],
        "react"
    ],
    "plugins": [
        "transform-export-extensions",
        "transform-class-properties",
        "transform-object-rest-spread",
        "transform-remove-strict-mode"
    ]
}