diff --git a/packages/webpack/src/config/base.js b/packages/webpack/src/config/base.js
index a81ef7b336..1a9e2fc697 100644
--- a/packages/webpack/src/config/base.js
+++ b/packages/webpack/src/config/base.js
@@ -38,7 +38,8 @@ export default class WebpackBaseConfig {
       isDev: this.dev,
       isServer: this.isServer,
       isClient: !this.isServer,
-      isModern: Boolean(this.isModern)
+      isModern: Boolean(this.isModern),
+      isLegacy: Boolean(!this.isModern)
     }
   }
 
@@ -57,10 +58,13 @@ export default class WebpackBaseConfig {
   normalizeTranspile () {
     // include SFCs in node_modules
     const items = [/\.vue\.js/i]
-    for (const pattern of this.buildContext.buildOptions.transpile) {
+    for (let pattern of this.buildContext.buildOptions.transpile) {
+      if (typeof pattern === 'function') {
+        pattern = pattern(this.nuxtEnv)
+      }
       if (pattern instanceof RegExp) {
         items.push(pattern)
-      } else {
+      } else if (typeof pattern === 'string') {
         const posixModule = pattern.replace(/\\/g, '/')
         items.push(new RegExp(escapeRegExp(path.normalize(posixModule))))
       }
diff --git a/packages/webpack/src/config/server.js b/packages/webpack/src/config/server.js
index bdd20602f8..a67cc366a9 100644
--- a/packages/webpack/src/config/server.js
+++ b/packages/webpack/src/config/server.js
@@ -20,10 +20,13 @@ export default class WebpackServerConfig extends WebpackBaseConfig {
     const whitelist = [
       /\.(?!js(x|on)?$)/i
     ]
-    for (const pattern of this.buildContext.buildOptions.transpile) {
+    for (let pattern of this.buildContext.buildOptions.transpile) {
+      if (typeof pattern === 'function') {
+        pattern = pattern(this.nuxtEnv)
+      }
       if (pattern instanceof RegExp) {
         whitelist.push(pattern)
-      } else {
+      } else if (typeof pattern === 'string') {
         const posixModule = pattern.replace(/\\/g, '/')
         whitelist.push(new RegExp(escapeRegExp(posixModule)))
       }
diff --git a/test/unit/basic.dev.test.js b/test/unit/basic.dev.test.js
index 22a1fa29a5..499f9a0a20 100644
--- a/test/unit/basic.dev.test.js
+++ b/test/unit/basic.dev.test.js
@@ -30,7 +30,8 @@ describe('basic dev', () => {
           '@scoped/packageA',
           '@scoped\\packageB',
           'vue.test.js',
-          /vue-test/
+          /vue-test/,
+          ({ isModern }) => isModern ? 'modern-test' : 'normal-test'
         ],
         loaders: {
           cssModules: {
@@ -77,6 +78,7 @@ describe('basic dev', () => {
     expect(transpile(path.normalize('node_modules/test.vue.js'))).toBe(true)
     expect(transpile(path.normalize('node_modules/@scoped/packageA/src/index.js'))).toBe(true)
     expect(transpile(path.normalize('node_modules/@scoped/packageB/src/index.js'))).toBe(true)
+    expect(transpile(path.normalize('node_modules/normal-test'))).toBe(true)
   })
 
   test('Config: build.filenames', () => {