Support for devServer.client.webSocketURL

[syncjuncture]

export default (config, env, helpers) => {
  if (!env.isProd) {
    config.devServer.client = {
      webSocketURL: "ws://localhost:PORT/ws",
    };
  }
};

Reference: https://webpack.js.org/configuration/dev-server/

[rschristian]

You're referencing the wrong version of the docs. That's v4, while the latest release of preact-cli is on v3.

That being said, we actually just landed support for v4 in #1646, though it has not yet been released.