feat(webpack,cli): standalone build mode (#4661)

* feat(webpack,cli): standalone build mode

* revert typo

packages/cli/src/commands/build.js

@@ -46,6 +46,16 @@ export default {
           options.build.quiet = !!argv.quiet
         }
       }
+    },
+    standalone: {
+      type: 'boolean',
+      default: false,
+      description: 'Bundle all server dependencies (useful for nuxt-start)',
+      prepare(cmd, options, argv) {
+        if (argv.standalone) {
+          options.build.standalone = true
+        }
+      }
     }
   },
   async run(cmd) {

packages/config/src/config/build.js

@@ -10,6 +10,7 @@ export default () => ({
   ssr: undefined,
   parallel: false,
   cache: false,
+  standalone: false,
   publicPath: '/_nuxt/',
   filenames: {
     // { isDev, isClient, isServer }

packages/webpack/src/config/server.js

@@ -86,16 +86,18 @@ export default class WebpackServerConfig extends WebpackBaseConfig {
     // https://webpack.js.org/configuration/externals/#externals
     // https://github.com/liady/webpack-node-externals
     // https://vue-loader.vuejs.org/migrating.html#ssr-externals
-    this.options.modulesDir.forEach((dir) => {
-      if (fs.existsSync(dir)) {
-        config.externals.push(
-          nodeExternals({
-            whitelist: this.whitelist,
-            modulesDir: dir
-          })
-        )
-      }
-    })
+    if (!this.options.build.standalone && !this.options.dev) {
+      this.options.modulesDir.forEach((dir) => {
+        if (fs.existsSync(dir)) {
+          config.externals.push(
+            nodeExternals({
+              whitelist: this.whitelist,
+              modulesDir: dir
+            })
+          )
+        }
+      })
+    }
 
     return config
   }