Backport SSR fix (#8174)

Author: BrennanConroy

src/SignalR/clients/ts/signalr/src/DefaultHttpClient.ts

@@ -4,16 +4,9 @@
 import { AbortError } from "./Errors";
 import { HttpClient, HttpRequest, HttpResponse } from "./HttpClient";
 import { ILogger } from "./ILogger";
+import { NodeHttpClient } from "./NodeHttpClient";
 import { XhrHttpClient } from "./XhrHttpClient";
 
-let nodeHttpClientModule: any;
-if (typeof XMLHttpRequest === "undefined") {
-    // In order to ignore the dynamic require in webpack builds we need to do this magic
-    // @ts-ignore: TS doesn't know about these names
-    const requireFunc = typeof __webpack_require__ === "function" ? __non_webpack_require__ : require;
-    nodeHttpClientModule = requireFunc("./NodeHttpClient");
-}
-
 /** Default implementation of {@link @aspnet/signalr.HttpClient}. */
 export class DefaultHttpClient extends HttpClient {
     private readonly httpClient: HttpClient;
@@ -24,10 +17,8 @@ export class DefaultHttpClient extends HttpClient {
 
         if (typeof XMLHttpRequest !== "undefined") {
             this.httpClient = new XhrHttpClient(logger);
-        } else if (typeof nodeHttpClientModule !== "undefined") {
-            this.httpClient = new nodeHttpClientModule.NodeHttpClient(logger);
         } else {
-            throw new Error("No HttpClient could be created.");
+            this.httpClient = new NodeHttpClient(logger);
         }
     }
 

src/SignalR/clients/ts/signalr/src/EmptyNodeHttpClient.ts

@@ -0,0 +1,18 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+// This is an empty implementation of the NodeHttpClient that will be included in browser builds so the output file will be smaller
+
+import { HttpClient, HttpResponse } from "./HttpClient";
+import { ILogger } from "./ILogger";
+
+export class NodeHttpClient extends HttpClient {
+    // @ts-ignore: Need ILogger to compile, but unused variables generate errors
+    public constructor(logger: ILogger) {
+        super();
+    }
+
+    public send(): Promise<HttpResponse> {
+        return Promise.reject(new Error("If using Node either provide an XmlHttpRequest polyfill or consume the cjs or esm script instead of the browser/signalr.js one."));
+    }
+}

src/SignalR/clients/ts/signalr/src/NodeHttpClient.ts

@@ -1,23 +1,36 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-import * as Request from "request";
+// @ts-ignore: This will be removed from built files and is here to make the types available during dev work
+import * as Request from "@types/request";
 
 import { AbortError, HttpError, TimeoutError } from "./Errors";
 import { HttpClient, HttpRequest, HttpResponse } from "./HttpClient";
 import { ILogger, LogLevel } from "./ILogger";
 import { isArrayBuffer } from "./Utils";
 
+let requestModule: Request.RequestAPI<Request.Request, Request.CoreOptions, Request.RequiredUriUrl>;
+if (typeof XMLHttpRequest === "undefined") {
+    // In order to ignore the dynamic require in webpack builds we need to do this magic
+    // @ts-ignore: TS doesn't know about these names
+    const requireFunc = typeof __webpack_require__ === "function" ? __non_webpack_require__ : require;
+    requestModule = requireFunc("request");
+}
+
 export class NodeHttpClient extends HttpClient {
     private readonly logger: ILogger;
-    private readonly request: Request.RequestAPI<Request.Request, Request.CoreOptions, Request.RequiredUriUrl>;
+    private readonly request: typeof requestModule;
     private readonly cookieJar: Request.CookieJar;
 
     public constructor(logger: ILogger) {
         super();
+        if (typeof requestModule === "undefined") {
+            throw new Error("The 'request' module could not be loaded.");
+        }
+
         this.logger = logger;
-        this.cookieJar = Request.jar();
-        this.request = Request.defaults({ jar: this.cookieJar });
+        this.cookieJar = requestModule.jar();
+        this.request = requestModule.defaults({ jar: this.cookieJar });
     }
 
     public send(httpRequest: HttpRequest): Promise<HttpResponse> {

src/SignalR/clients/ts/webpack.config.base.js

@@ -39,7 +39,10 @@ module.exports = function (modulePath, browserBaseName, options) {
         },
         resolve: {
             extensions: [".ts", ".js"],
-            alias: options.alias,
+            alias: {
+                "./NodeHttpClient": path.resolve(__dirname, "signalr/src/EmptyNodeHttpClient.ts"),
+                ...options.alias,
+            }
         },
         output: {
             filename: `${browserBaseName}.js`,
@@ -72,7 +75,6 @@ module.exports = function (modulePath, browserBaseName, options) {
             }),
             // ES6 Promise uses this module in certain circumstances but we don't need it.
             new webpack.IgnorePlugin(/vertx/),
-            new webpack.IgnorePlugin(/NodeHttpClient/),
             new webpack.IgnorePlugin(/eventsource/),
         ],
         externals: options.externals,