electron · MarshallOfSound · Feb 26, 2019 · Feb 13, 2019 · Feb 14, 2019
diff --git a/packages/plugin/webpack/src/Config.ts b/packages/plugin/webpack/src/Config.ts
@@ -68,4 +68,8 @@ export interface WebpackPluginConfig {
   * Electron Forge webpack configuration for your renderer process
   */
  renderer: WebpackPluginRendererConfig;
+  /**
+   * The TCP port for the dev servers. Defaults to 3000.
+   */
+  port?: number;
 }
diff --git a/packages/plugin/webpack/src/WebpackPlugin.ts b/packages/plugin/webpack/src/WebpackPlugin.ts
@@ -20,7 +20,7 @@ import once from './util/once';
 import { WebpackPluginConfig, WebpackPluginEntryPoint, WebpackPreloadEntryPoint } from './Config';

 const d = debug('electron-forge:plugin:webpack');
-const BASE_PORT = 3000;
+const DEFAULT_PORT = 3000;

 export default class WebpackPlugin extends PluginBase<WebpackPluginConfig> {
  name = 'webpack';
@@ -30,10 +30,21 @@ export default class WebpackPlugin extends PluginBase<WebpackPluginConfig> {
  private watchers: webpack.Compiler.Watching[] = [];
  private servers: http.Server[] = [];
  private loggers: Logger[] = [];
+  private port = DEFAULT_PORT;

  constructor(c: WebpackPluginConfig) {
    super(c);

+    if (c.port) {
+      if (c.port < 1024) {
+        throw new Error(`Cannot specify port (${c.port}) below 1024, as they are privileged`);
+      } else if (c.port > 65535) {
+        throw new Error(`Port specified (${c.port}) is not a valid TCP port.`);
+      } else {
+        this.port = c.port;
+      }
+    }
+
    this.startLogic = this.startLogic.bind(this);
    this.getHook = this.getHook.bind(this);
  }
@@ -153,12 +164,12 @@ Your packaged app may be larger than expected if you dont ignore everything othe
        defines[`${entryPoint.name.toUpperCase().replace(/ /g, '_')}_WEBPACK_ENTRY`] =
          this.isProd
          ? `\`file://\$\{require('path').resolve(__dirname, '../renderer', '${upOneMore ? '..' : '.'}', '${entryPoint.name}', 'index.html')\}\``
-          : `'http://localhost:${BASE_PORT}/${entryPoint.name}'`;
+          : `'http://localhost:${this.port}/${entryPoint.name}'`;
      } else {
        defines[`${entryPoint.name.toUpperCase().replace(/ /g, '_')}_WEBPACK_ENTRY`] =
          this.isProd
          ? `\`file://\$\{require('path').resolve(__dirname, '../renderer', '${upOneMore ? '..' : '.'}', '${entryPoint.name}', 'index.js')\}\``
-          : `'http://localhost:${BASE_PORT}/${entryPoint.name}/index.js'`;
+          : `'http://localhost:${this.port}/${entryPoint.name}/index.js'`;
      }

      const preloadDefineKey = `${entryPoint.name.toUpperCase().replace(/ /g, '_')}_PRELOAD_WEBPACK_ENTRY`;
@@ -340,7 +351,7 @@ Your packaged app may be larger than expected if you dont ignore everything othe
      const app = express();
      app.use(server);
      app.use(webpackHotMiddleware(compiler));
-      this.servers.push(app.listen(BASE_PORT));
+      this.servers.push(app.listen(this.port));
    });

    await asyncOra('Compiling Preload Scripts', async () => {