diff --git a/src/node/build/bundle.ts b/src/node/build/bundle.ts
index 91543b09b708..b3ef8d96c2f7 100644
--- a/src/node/build/bundle.ts
+++ b/src/node/build/bundle.ts
@@ -3,7 +3,7 @@ import slash from 'slash'
 import fs from 'fs-extra'
 import { APP_PATH, createResolver, SITE_DATA_REQUEST_PATH } from '../resolver'
 import { BuildOptions } from './build'
-import { SiteConfig } from '../config'
+import { resolveUserConfig, SiteConfig } from '../config'
 import { Plugin, OutputAsset, OutputChunk } from 'rollup'
 import { createMarkdownToVueRenderFn } from '../markdownToVue'
 import {
@@ -34,7 +34,8 @@ export async function bundle(
   options: BuildOptions
 ): Promise<[BuildResult, BuildResult, Record<string, string>]> {
   const root = config.root
-  const resolver = createResolver(config.themeDir)
+  const userConfig = await resolveUserConfig(root)
+  const resolver = createResolver(config.themeDir, userConfig)
   const markdownToVue = createMarkdownToVueRenderFn(root)
 
   let isClientBuild = true
diff --git a/src/node/config.ts b/src/node/config.ts
index ecc5248ad30e..3df6646c83e0 100644
--- a/src/node/config.ts
+++ b/src/node/config.ts
@@ -17,6 +17,7 @@ export interface UserConfig<ThemeConfig = any> {
   head?: HeadConfig[]
   themeConfig?: ThemeConfig
   locales?: Record<string, LocaleConfig>
+  alias?: Record<string, string>
   // TODO locales support etc.
 }
 
@@ -37,6 +38,7 @@ const resolve = (root: string, file: string) =>
 export async function resolveConfig(
   root: string = process.cwd()
 ): Promise<SiteConfig> {
+  const userConfig = await resolveUserConfig(root)
   const site = await resolveSiteData(root)
 
   // resolve theme path
@@ -53,13 +55,13 @@ export async function resolveConfig(
     configPath: resolve(root, 'config.js'),
     outDir: resolve(root, 'dist'),
     tempDir: path.resolve(APP_PATH, 'temp'),
-    resolver: createResolver(themeDir)
+    resolver: createResolver(themeDir, userConfig)
   }
 
   return config
 }
 
-export async function resolveSiteData(root: string): Promise<SiteData> {
+export async function resolveUserConfig(root: string) {
   // load user config
   const configPath = resolve(root, 'config.js')
   const hasUserConfig = await fs.pathExists(configPath)
@@ -72,6 +74,12 @@ export async function resolveSiteData(root: string): Promise<SiteData> {
     debug(`no config file found.`)
   }
 
+  return userConfig
+}
+
+export async function resolveSiteData(root: string): Promise<SiteData> {
+  const userConfig = await resolveUserConfig(root)
+
   return {
     lang: userConfig.lang || 'en-US',
     title: userConfig.title || 'VitePress',
diff --git a/src/node/resolver.ts b/src/node/resolver.ts
index 9ba866acc8b1..6ac5afc22718 100644
--- a/src/node/resolver.ts
+++ b/src/node/resolver.ts
@@ -1,5 +1,6 @@
 import path from 'path'
 import { Resolver } from 'vite'
+import { UserConfig } from './config'
 
 export const APP_PATH = path.join(__dirname, '../client/app')
 export const SHARED_PATH = path.join(__dirname, '../client/shared')
@@ -15,9 +16,13 @@ export const SITE_DATA_REQUEST_PATH = '/' + SITE_DATA_ID
 // so that we can resolve custom requests that start with /@app or /@theme
 // we also need to map file paths back to their public served paths so that
 // vite HMR can send the correct update notifications to the client.
-export function createResolver(themeDir: string): Resolver {
+export function createResolver(
+  themeDir: string,
+  userConfig: UserConfig
+): Resolver {
   return {
     alias: {
+      ...userConfig.alias,
       '/@app/': APP_PATH,
       '/@theme/': themeDir,
       '/@shared/': SHARED_PATH,