{
    "comments": false, // preserve JS comments at compilation time
    "compact": false, // All optional newlines and whitespace will be omitted when generating code in compact mode.
    "retainLines": false, // preserve lines if cannot user source maps
    "minified": true, // omits block-end semicolons, omits () from new Foo() when possible, and may output shorter versions of literals.
    "presets": ["@babel/preset-env"] // compile for each environment that supports ES5
}
