The webpack-dev-server is a little node.js Express server, which uses the

Note that Hot Module Replacement (HMR) is still an experimental feature. Introduction Hot Module

In some cases webpack cannot parse some file, because it has a unsupported module format or isn?t even in a module format. Therefore you have many options to convert the file

webpack is fed a configuration object. Depending on your usage of webpack there are two ways to pass this configuration object: