feat: optionally strip non-client or non-server code (#6149)

packages/config/src/config/build.js

@@ -59,6 +59,7 @@ export default () => ({
   plugins: [],
   terser: {},
   hardSource: false,
+  aggressiveCodeRemoval: false,
   optimizeCSS: undefined,
   optimization: {
     runtimeChunk: 'single',

packages/config/test/__snapshots__/options.test.js.snap

@@ -20,6 +20,7 @@ Object {
   "build": Object {
     "_publicPath": "/_nuxt/",
     "additionalExtensions": Array [],
+    "aggressiveCodeRemoval": false,
     "analyze": false,
     "babel": Object {
       "babelrc": false,

packages/config/test/config/__snapshots__/index.test.js.snap

@@ -7,6 +7,7 @@ Object {
   "alias": Object {},
   "build": Object {
     "additionalExtensions": Array [],
+    "aggressiveCodeRemoval": false,
     "analyze": false,
     "babel": Object {
       "babelrc": false,
@@ -360,6 +361,7 @@ Object {
   "alias": Object {},
   "build": Object {
     "additionalExtensions": Array [],
+    "aggressiveCodeRemoval": false,
     "analyze": false,
     "babel": Object {
       "babelrc": false,

packages/webpack/src/config/base.js

@@ -115,7 +115,7 @@ export default class WebpackBaseConfig {
     }
 
     if (!options.babelrc && !options.presets) {
-      options.presets = [ defaultPreset ]
+      options.presets = [defaultPreset]
     }
 
     return options
@@ -141,6 +141,12 @@ export default class WebpackBaseConfig {
       'process.mode': JSON.stringify(this.mode),
       'process.static': this.buildContext.isStatic
     }
+    if (this.buildContext.buildOptions.aggressiveCodeRemoval) {
+      env['typeof process'] = JSON.stringify(this.isServer ? 'object' : 'undefined')
+      env['typeof window'] = JSON.stringify(!this.isServer ? 'object' : 'undefined')
+      env['typeof document'] = JSON.stringify(!this.isServer ? 'object' : 'undefined')
+    }
+
     Object.entries(this.buildContext.options.env).forEach(([key, value]) => {
       env['process.env.' + key] =
         ['boolean', 'number'].includes(typeof value)

packages/webpack/src/config/client.js

@@ -34,13 +34,16 @@ export default class WebpackClientConfig extends WebpackBaseConfig {
   }
 
   env () {
-    return Object.assign(super.env(), {
-      'process.env.VUE_ENV': JSON.stringify('client'),
-      'process.browser': true,
-      'process.client': true,
-      'process.server': false,
-      'process.modern': false
-    })
+    return Object.assign(
+      super.env(),
+      {
+        'process.env.VUE_ENV': JSON.stringify('client'),
+        'process.browser': true,
+        'process.client': true,
+        'process.server': false,
+        'process.modern': false
+      }
+    )
   }
 
   optimization () {

packages/webpack/src/config/server.js

@@ -26,13 +26,16 @@ export default class WebpackServerConfig extends WebpackBaseConfig {
   }
 
   env () {
-    return Object.assign(super.env(), {
-      'process.env.VUE_ENV': JSON.stringify('server'),
-      'process.browser': false,
-      'process.client': false,
-      'process.server': true,
-      'process.modern': false
-    })
+    return Object.assign(
+      super.env(),
+      {
+        'process.env.VUE_ENV': JSON.stringify('server'),
+        'process.browser': false,
+        'process.client': false,
+        'process.server': true,
+        'process.modern': false
+      }
+    )
   }
 
   optimization () {