refactor(server): fixed capitalization

lib/servers/BaseServer.js

@@ -0,0 +1,9 @@
+'use strict';
+
+// base class that users should extend if they are making their own
+// server implementation
+module.exports = class BaseServer {
+  constructor(server) {
+    this.server = server;
+  }
+};

lib/servers/SockJSServer.js

@@ -0,0 +1,64 @@
+'use strict';
+
+/* eslint-disable
+  class-methods-use-this,
+  func-names
+*/
+const sockjs = require('sockjs');
+const BaseServer = require('./BaseServer');
+
+// Workaround for sockjs@~0.3.19
+// sockjs will remove Origin header, however Origin header is required for checking host.
+// See https://github.com/webpack/webpack-dev-server/issues/1604 for more information
+{
+  // eslint-disable-next-line global-require
+  const SockjsSession = require('sockjs/lib/transport').Session;
+  const decorateConnection = SockjsSession.prototype.decorateConnection;
+  SockjsSession.prototype.decorateConnection = function(req) {
+    decorateConnection.call(this, req);
+    const connection = this.connection;
+    if (
+      connection.headers &&
+      !('origin' in connection.headers) &&
+      'origin' in req.headers
+    ) {
+      connection.headers.origin = req.headers.origin;
+    }
+  };
+}
+
+module.exports = class SockJSServer extends BaseServer {
+  // options has: error (function), debug (function), server (http/s server), path (string)
+  constructor(server) {
+    super(server);
+    this.socket = sockjs.createServer({
+      // Use provided up-to-date sockjs-client
+      sockjs_url: '/__webpack_dev_server__/sockjs.bundle.js',
+      // Limit useless logs
+      log: (severity, line) => {
+        if (severity === 'error') {
+          this.server.log.error(line);
+        } else {
+          this.server.log.debug(line);
+        }
+      },
+    });
+
+    this.socket.installHandlers(this.server.listeningApp, {
+      prefix: this.server.sockPath,
+    });
+  }
+
+  send(connection, message) {
+    connection.write(message);
+  }
+
+  close(connection) {
+    connection.close();
+  }
+
+  // f should return the resulting connection
+  onConnection(f) {
+    this.socket.on('connection', f);
+  }
+};

lib/servers/WsServer.js

@@ -0,0 +1,8 @@
+'use strict';
+
+// const ws = require('ws');
+const BaseServer = require('./BaseServer');
+
+// ws server implementation under construction
+// will need changes in the client as well to function
+module.exports = class WsServer extends BaseServer {};