feat: allow to disable web socket server

README.md

@@ -159,6 +159,7 @@ Options:
   --watch-files-reset                       Clear all items provided in 'watchFiles' configuration. Allows to configure list of globs/directories/files
                                             to watch for file changes.
   --web-socket-server <value>               Allows to set web socket server and options (by default 'ws').
+  --no-web-socket-server                    Negative 'web-socket-server' option.
 
 Global options:
   --color                                   Enable colors on console.

bin/cli-flags.js

@@ -298,7 +298,7 @@ module.exports = {
     configs: [
       {
         type: 'enum',
-        values: ['sockjs', 'ws'],
+        values: [false, 'sockjs', 'ws'],
         multiple: false,
         description:
           "Allows to set web socket server and options (by default 'ws').",

lib/Server.js

@@ -671,11 +671,7 @@ class Server {
   }
 
   createWebSocketServer() {
-    this.webSocketServerImplementation =
-      this.getWebSocketServerImplementation();
-    // eslint-disable-next-line new-cap
-    this.webSocketServer = new this.webSocketServerImplementation(this);
-
+    this.webSocketServer = new (this.getWebSocketServerImplementation())(this);
     this.webSocketServer.implementation.on('connection', (client, request) => {
       const headers =
         // eslint-disable-next-line no-nested-ternary
@@ -1037,8 +1033,14 @@ class Server {
             fs.chmodSync(this.options.ipc, READ_WRITE);
           }
 
-          if (Boolean(this.options.hot) || this.options.liveReload) {
-            this.createWebSocketServer();
+          if (this.options.webSocketServer) {
+            try {
+              this.createWebSocketServer();
+            } catch (webSocketServerError) {
+              fn.call(this.server, webSocketServerError);
+
+              return;
+            }
           }
 
           if (this.options.bonjour) {

lib/options.json

@@ -635,7 +635,7 @@
       "link": "https://webpack.js.org/configuration/dev-server/#devserverwebsocketserver"
     },
     "WebSocketServerEnum": {
-      "enum": ["sockjs", "ws"]
+      "enum": [false, "sockjs", "ws"]
     },
     "WebSocketServerFunction": {
       "instanceof": "Function"

lib/utils/DevServerPlugin.js

@@ -18,6 +18,7 @@ class DevServerPlugin {
     let clientImplementationFound = true;
 
     const isKnownWebSocketServerImplementation =
+      this.options.webSocketServer &&
       typeof this.options.webSocketServer.type === 'string' &&
       (this.options.webSocketServer.type === 'ws' ||
         this.options.webSocketServer.type === 'sockjs');
@@ -29,6 +30,8 @@ class DevServerPlugin {
         clientTransport = this.options.client.webSocketTransport;
       } else if (isKnownWebSocketServerImplementation) {
         clientTransport = this.options.webSocketServer.type;
+      } else {
+        clientTransport = 'ws';
       }
     } else {
       clientTransport = 'ws';
@@ -186,8 +189,10 @@ class DevServerPlugin {
    * @returns {string}
    */
   getClientEntry() {
-    const webSocketURL = this.getWebSocketURL();
     /** @type {string} */
+    const webSocketURL = this.options.webSocketServer
+      ? this.getWebSocketURL()
+      : '';
 
     return `${require.resolve('../../client/index.js')}?${webSocketURL}`;
   }
@@ -243,11 +248,8 @@ class DevServerPlugin {
 
     const additionalEntries = [];
 
-    if (
-      this.options.client &&
-      this.isWebTarget(compiler.options) &&
-      (Boolean(this.options.hot) || this.options.liveReload)
-    ) {
+    // TODO maybe empty empty client
+    if (this.options.client && this.isWebTarget(compiler.options)) {
       const clientEntry = this.getClientEntry();
 
       additionalEntries.push(clientEntry);

lib/utils/normalizeOptions.js

@@ -409,6 +409,11 @@ function normalizeOptions(compiler, options, logger, cacheDir) {
       type: defaultWebSocketServerType,
       options: defaultWebSocketServerOptions,
     };
+  } else if (
+    typeof options.webSocketServer === 'boolean' &&
+    !options.webSocketServer
+  ) {
+    options.webSocketServer = false;
   } else if (
     typeof options.webSocketServer === 'string' ||
     typeof options.webSocketServer === 'function'

test/__snapshots__/validate-options.test.js.snap.webpack4

@@ -666,43 +666,43 @@ exports[`options validate should throw an error on the "webSocketServer" option
 exports[`options validate should throw an error on the "webSocketServer" option with '{"type":true}' value 1`] = `
 "ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
  - options.webSocketServer should be one of these:
-   \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
+   false | \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
    -> Allows to set web socket server and options (by default 'ws').
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserverwebsocketserver
    Details:
     * options.webSocketServer.type should be one of these:
-      \\"sockjs\\" | \\"ws\\" | non-empty string | function
+      false | \\"sockjs\\" | \\"ws\\" | non-empty string | function
       Details:
        * options.webSocketServer.type should be one of these:
-         \\"sockjs\\" | \\"ws\\"
+         false | \\"sockjs\\" | \\"ws\\"
        * options.webSocketServer.type should be a non-empty string.
        * options.webSocketServer.type should be an instance of function."
 `;
 
-exports[`options validate should throw an error on the "webSocketServer" option with 'false' value 1`] = `
+exports[`options validate should throw an error on the "webSocketServer" option with 'null' value 1`] = `
 "ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
  - options.webSocketServer should be one of these:
-   \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
+   false | \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
    -> Allows to set web socket server and options (by default 'ws').
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserverwebsocketserver
    Details:
     * options.webSocketServer should be one of these:
-      \\"sockjs\\" | \\"ws\\"
+      false | \\"sockjs\\" | \\"ws\\"
     * options.webSocketServer should be a non-empty string.
     * options.webSocketServer should be an instance of function.
     * options.webSocketServer should be an object:
       object { type?, options? }"
 `;
 
-exports[`options validate should throw an error on the "webSocketServer" option with 'null' value 1`] = `
+exports[`options validate should throw an error on the "webSocketServer" option with 'true' value 1`] = `
 "ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
  - options.webSocketServer should be one of these:
-   \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
+   false | \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
    -> Allows to set web socket server and options (by default 'ws').
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserverwebsocketserver
    Details:
     * options.webSocketServer should be one of these:
-      \\"sockjs\\" | \\"ws\\"
+      false | \\"sockjs\\" | \\"ws\\"
     * options.webSocketServer should be a non-empty string.
     * options.webSocketServer should be an instance of function.
     * options.webSocketServer should be an object:

test/__snapshots__/validate-options.test.js.snap.webpack5

@@ -666,43 +666,43 @@ exports[`options validate should throw an error on the "webSocketServer" option
 exports[`options validate should throw an error on the "webSocketServer" option with '{"type":true}' value 1`] = `
 "ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
  - options.webSocketServer should be one of these:
-   \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
+   false | \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
    -> Allows to set web socket server and options (by default 'ws').
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserverwebsocketserver
    Details:
     * options.webSocketServer.type should be one of these:
-      \\"sockjs\\" | \\"ws\\" | non-empty string | function
+      false | \\"sockjs\\" | \\"ws\\" | non-empty string | function
       Details:
        * options.webSocketServer.type should be one of these:
-         \\"sockjs\\" | \\"ws\\"
+         false | \\"sockjs\\" | \\"ws\\"
        * options.webSocketServer.type should be a non-empty string.
        * options.webSocketServer.type should be an instance of function."
 `;
 
-exports[`options validate should throw an error on the "webSocketServer" option with 'false' value 1`] = `
+exports[`options validate should throw an error on the "webSocketServer" option with 'null' value 1`] = `
 "ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
  - options.webSocketServer should be one of these:
-   \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
+   false | \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
    -> Allows to set web socket server and options (by default 'ws').
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserverwebsocketserver
    Details:
     * options.webSocketServer should be one of these:
-      \\"sockjs\\" | \\"ws\\"
+      false | \\"sockjs\\" | \\"ws\\"
     * options.webSocketServer should be a non-empty string.
     * options.webSocketServer should be an instance of function.
     * options.webSocketServer should be an object:
       object { type?, options? }"
 `;
 
-exports[`options validate should throw an error on the "webSocketServer" option with 'null' value 1`] = `
+exports[`options validate should throw an error on the "webSocketServer" option with 'true' value 1`] = `
 "ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
  - options.webSocketServer should be one of these:
-   \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
+   false | \\"sockjs\\" | \\"ws\\" | non-empty string | function | object { type?, options? }
    -> Allows to set web socket server and options (by default 'ws').
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserverwebsocketserver
    Details:
     * options.webSocketServer should be one of these:
-      \\"sockjs\\" | \\"ws\\"
+      false | \\"sockjs\\" | \\"ws\\"
     * options.webSocketServer should be a non-empty string.
     * options.webSocketServer should be an instance of function.
     * options.webSocketServer should be an object:

test/cli/__snapshots__/basic.test.js.snap.webpack4

@@ -61,6 +61,7 @@ Options:
   --client-web-socket-url-username <value>  Tells clients connected to devServer to use the provided username to authenticate.
   --client-web-socket-url-password <value>  Tells clients connected to devServer to use the provided password to authenticate.
   --web-socket-server <value>               Allows to set web socket server and options (by default 'ws').
+  --no-web-socket-server                    Negative 'web-socket-server' option.
   --compress                                Enables gzip compression for everything served.
   --no-compress                             Disables gzip compression for everything served.
   --history-api-fallback                    Allows to proxy requests through a specified index page (by default 'index.html'), useful for Single Page Applications that utilise the HTML5 History API.

test/cli/__snapshots__/basic.test.js.snap.webpack5

@@ -104,6 +104,7 @@ Options:
   --watch-files <value...>                  Allows to configure list of globs/directories/files to watch for file changes.
   --watch-files-reset                       Clear all items provided in 'watchFiles' configuration. Allows to configure list of globs/directories/files to watch for file changes.
   --web-socket-server <value>               Allows to set web socket server and options (by default 'ws').
+  --no-web-socket-server                    Negative 'web-socket-server' option.
 
 Global options:
   --color                                   Enable colors on console.

test/e2e/__snapshots__/hot-and-live-reload.test.js.snap.webpack4

@@ -1,14 +1,26 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`hot and live reload should not refresh content when hot and no live reload disabled (default): console messages 1`] = `Array []`;
+exports[`hot and live reload should not refresh content when hot and no live reload disabled (default): console messages 1`] = `
+Array [
+  "[webpack-dev-server] App updated. Recompiling...",
+]
+`;
 
 exports[`hot and live reload should not refresh content when hot and no live reload disabled (default): page errors 1`] = `Array []`;
 
-exports[`hot and live reload should not refresh content when hot and no live reload disabled (sockjs): console messages 1`] = `Array []`;
+exports[`hot and live reload should not refresh content when hot and no live reload disabled (sockjs): console messages 1`] = `
+Array [
+  "[webpack-dev-server] App updated. Recompiling...",
+]
+`;
 
 exports[`hot and live reload should not refresh content when hot and no live reload disabled (sockjs): page errors 1`] = `Array []`;
 
-exports[`hot and live reload should not refresh content when hot and no live reload disabled (ws): console messages 1`] = `Array []`;
+exports[`hot and live reload should not refresh content when hot and no live reload disabled (ws): console messages 1`] = `
+Array [
+  "[webpack-dev-server] App updated. Recompiling...",
+]
+`;
 
 exports[`hot and live reload should not refresh content when hot and no live reload disabled (ws): page errors 1`] = `Array []`;
 
@@ -47,6 +59,17 @@ Array [
 
 exports[`hot and live reload should work and allow to disable live reload using the "webpack-dev-server-live-reload=false" (default): page errors 1`] = `Array []`;
 
+exports[`hot and live reload should work and do nothing when web socket server disabled (default): console messages 1`] = `
+Array [
+  "[HMR] Waiting for update signal from WDS...",
+  "WebSocket connection to 'ws://localhost:8095/ws' failed: Error during WebSocket handshake: Unexpected response code: 404",
+  "[webpack-dev-server] JSHandle@object",
+  "[webpack-dev-server] Disconnected!",
+]
+`;
+
+exports[`hot and live reload should work and do nothing when web socket server disabled (default): page errors 1`] = `Array []`;
+
 exports[`hot and live reload should work and refresh content using hot module replacement (default): console messages 1`] = `
 Array [
   "[HMR] Waiting for update signal from WDS...",

test/e2e/__snapshots__/hot-and-live-reload.test.js.snap.webpack5

@@ -1,14 +1,26 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`hot and live reload should not refresh content when hot and no live reload disabled (default): console messages 1`] = `Array []`;
+exports[`hot and live reload should not refresh content when hot and no live reload disabled (default): console messages 1`] = `
+Array [
+  "[webpack-dev-server] App updated. Recompiling...",
+]
+`;
 
 exports[`hot and live reload should not refresh content when hot and no live reload disabled (default): page errors 1`] = `Array []`;
 
-exports[`hot and live reload should not refresh content when hot and no live reload disabled (sockjs): console messages 1`] = `Array []`;
+exports[`hot and live reload should not refresh content when hot and no live reload disabled (sockjs): console messages 1`] = `
+Array [
+  "[webpack-dev-server] App updated. Recompiling...",
+]
+`;
 
 exports[`hot and live reload should not refresh content when hot and no live reload disabled (sockjs): page errors 1`] = `Array []`;
 
-exports[`hot and live reload should not refresh content when hot and no live reload disabled (ws): console messages 1`] = `Array []`;
+exports[`hot and live reload should not refresh content when hot and no live reload disabled (ws): console messages 1`] = `
+Array [
+  "[webpack-dev-server] App updated. Recompiling...",
+]
+`;
 
 exports[`hot and live reload should not refresh content when hot and no live reload disabled (ws): page errors 1`] = `Array []`;
 
@@ -47,6 +59,17 @@ Array [
 
 exports[`hot and live reload should work and allow to disable live reload using the "webpack-dev-server-live-reload=false" (default): page errors 1`] = `Array []`;
 
+exports[`hot and live reload should work and do nothing when web socket server disabled (default): console messages 1`] = `
+Array [
+  "[HMR] Waiting for update signal from WDS...",
+  "WebSocket connection to 'ws://localhost:8095/ws' failed: Error during WebSocket handshake: Unexpected response code: 404",
+  "[webpack-dev-server] JSHandle@object",
+  "[webpack-dev-server] Disconnected!",
+]
+`;
+
+exports[`hot and live reload should work and do nothing when web socket server disabled (default): page errors 1`] = `Array []`;
+
 exports[`hot and live reload should work and refresh content using hot module replacement (default): console messages 1`] = `
 Array [
   "[HMR] Waiting for update signal from WDS...",

test/e2e/__snapshots__/web-socket-server-and-transport.test.js.snap.webpack4

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`web socket server and transport should throw an error on wrong path 1`] = `"When you use custom web socket implementation you must explicitly specify client.webSocketTransport. client.webSocketTransport must be a string denoting a default implementation (e.g. 'sockjs', 'ws') or a full path to a JS file via require.resolve(...) which exports a class "`;
+exports[`web socket server and transport should throw an error on wrong path 1`] = `"webSocketServer (webSocketServer.type) must be a string denoting a default implementation (e.g. 'ws', 'sockjs'), a full path to a JS file which exports a class extending BaseServer (webpack-dev-server/lib/servers/BaseServer.js) via require.resolve(...), or the class itself which extends BaseServer"`;
 
 exports[`web socket server and transport should use "sockjs" transport and "sockjs" web socket server 1`] = `
 Array [

test/e2e/__snapshots__/web-socket-server-and-transport.test.js.snap.webpack5

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`web socket server and transport should throw an error on wrong path 1`] = `"When you use custom web socket implementation you must explicitly specify client.webSocketTransport. client.webSocketTransport must be a string denoting a default implementation (e.g. 'sockjs', 'ws') or a full path to a JS file via require.resolve(...) which exports a class "`;
+exports[`web socket server and transport should throw an error on wrong path 1`] = `"webSocketServer (webSocketServer.type) must be a string denoting a default implementation (e.g. 'ws', 'sockjs'), a full path to a JS file which exports a class extending BaseServer (webpack-dev-server/lib/servers/BaseServer.js) via require.resolve(...), or the class itself which extends BaseServer"`;
 
 exports[`web socket server and transport should use "sockjs" transport and "sockjs" web socket server 1`] = `
 Array [