swc_ecma_transforms_base 41.0.1

rust port of babel and closure compiler.
Documentation 
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function _defaults(obj, defaults) {
    var keys = Object.getOwnPropertyNames(defaults);
    for (var i = 0; i < keys.length; i++) {
        var key = keys[i];
        var value = Object.getOwnPropertyDescriptor(defaults, key);
        if (value && value.configurable && obj[key] === undefined) {
            Object.defineProperty(obj, key, value);
        }
    }
    return obj;
}