in packages/transform/src/index.js [12:22]
visitor: getVisitor(context),
};
// Some presets manually call child presets, but fail to pass along the
// context object. Out of an abundance of caution, we verify that it
// exists first to avoid causing unnecessary breaking changes.
const version = context && context.version;
// The "name" property is not allowed in older versions of Babel (6.x)
// and will cause the plugin validator to throw an exception.
if (version && parseInt(version, 10) >= 7) {