__Feature to document__ dev server now supports type object for `open` option with [PR#2492](https://github.com/webpack/webpack-dev-server/pull/2492) <!-- Name of the feature(s) and a link to related pull request of the feature implementation. --> __Author(s)__ <!-- Mention feature author(s) in order to know who is assignable for review outside of the documentation team. --> __Additional information__ <!-- Please provide any additional information that is required in order to document the feature in the best possible way or say N/A if linked PR has more than enough details. -->
