gistfile1.txt

{
    "presets": [
        ["env", {
            "modules": false,
            "targets": {
                "browsers": ["> 1%", "last 2 versions", "not ie <= 8"]
            }
        }],
        "stage-0"
    ],
    "plugins": ["transform-runtime"],
    "env": {
        "test": {
            "presets": ["env", "stage-2"],
            "plugins": ["istanbul"]
        }
    }
}