Method getServerTransport

lib/Server.js:1564–1616

* @template T * @private * @returns {Promise } server transport

()

   * @returns {Promise<T>} server transport
   */
  async getServerTransport() {
    let implementation;
    let implementationFound = true;

    switch (
      typeof (
        /** @type {WebSocketServerConfiguration} */
        (this.options.webSocketServer).type
      )
    ) {
      case "string":
        // Could be 'ws', or a path that should be required
        if (
          /** @type {WebSocketServerConfiguration} */ (
            this.options.webSocketServer
          ).type === "ws"
        ) {
          implementation = (await import("./servers/WebsocketServer.js"))
            .default;
        } else {
          try {
            const mod = cjsRequire(
              /** @type {string} */ (
                /** @type {WebSocketServerConfiguration} */
                (this.options.webSocketServer).type
              ),
            );

            implementation = mod.default || mod;
          } catch {
            implementationFound = false;
          }
        }
        break;
      case "function":
        implementation =
          /** @type {WebSocketServerConfiguration} */
          (this.options.webSocketServer).type;
        break;
      default:
        implementationFound = false;
    }

    if (!implementationFound) {
      throw new Error(
        "webSocketServer (webSocketServer.type) must be a string denoting a default implementation (e.g. 'ws'), a resolvable module specifier or absolute file path " +
          "which exports a class extending BaseServer (webpack-dev-server/lib/servers/BaseServer.js), " +
          "or the class itself which extends BaseServer",
      );
    }

    return implementation;
  }

  /**
   * @returns {string}