feat: support passing vite config in vitepress config file via `vite` option

BREAKING CHANGE: Some config options have changed.

    - `vueOptions` renamed to `vue`
    - `alias` option has been removed. Use `vite.resovle.alias` instead.

src/node/alias.ts

@@ -22,7 +22,6 @@ export function resolveAliases(
   userConfig: UserConfig
 ): AliasOptions {
   const paths: Record<string, string> = {
-    ...userConfig.alias,
     '/@theme': themeDir,
     '/@shared': SHARED_PATH,
     [SITE_DATA_ID]: SITE_DATA_REQUEST_PATH

src/node/config.ts

@@ -2,7 +2,7 @@ import path from 'path'
 import fs from 'fs-extra'
 import chalk from 'chalk'
 import globby from 'globby'
-import { AliasOptions } from 'vite'
+import { AliasOptions, UserConfig as ViteConfig } from 'vite'
 import { Options as VuePluginOptions } from '@vitejs/plugin-vue'
 import { SiteData, HeadConfig, LocaleConfig } from './shared'
 import { resolveAliases, APP_PATH, DEFAULT_THEME_PATH } from './alias'
@@ -20,10 +20,16 @@ export interface UserConfig<ThemeConfig = any> {
   head?: HeadConfig[]
   themeConfig?: ThemeConfig
   locales?: Record<string, LocaleConfig>
-  alias?: Record<string, string>
   markdown?: MarkdownOptions
+  /**
+   * Opitons to pass on to @vitejs/plugin-vue
+   */
+  vue?: VuePluginOptions
+  /**
+   * Vite config
+   */
+  vite?: ViteConfig
   customData?: any
-  vueOptions?: VuePluginOptions
   exclude?: string[]
 }
 
@@ -36,8 +42,9 @@ export interface SiteConfig<ThemeConfig = any> {
   tempDir: string
   alias: AliasOptions
   pages: string[]
-  markdown?: MarkdownOptions
-  vueOptions?: VuePluginOptions
+  markdown: MarkdownOptions | undefined
+  vue: VuePluginOptions | undefined
+  vite: ViteConfig | undefined
 }
 
 const resolve = (root: string, file: string) =>
@@ -68,7 +75,8 @@ export async function resolveConfig(
     tempDir: path.resolve(APP_PATH, 'temp'),
     markdown: userConfig.markdown,
     alias: resolveAliases(themeDir, userConfig),
-    vueOptions: userConfig.vueOptions
+    vue: userConfig.vue,
+    vite: userConfig.vite
   }
 
   return config

src/node/plugin.ts

@@ -1,5 +1,5 @@
 import path from 'path'
-import { Plugin, ResolvedConfig } from 'vite'
+import { mergeConfig, Plugin, ResolvedConfig } from 'vite'
 import { SiteConfig, resolveSiteData } from './config'
 import { createMarkdownToVueRenderFn } from './markdownToVue'
 import { APP_PATH, SITE_DATA_REQUEST_PATH } from './alias'
@@ -8,7 +8,8 @@ import { slash } from './utils/slash'
 import { OutputAsset, OutputChunk } from 'rollup'
 
 const hashRE = /\.(\w+)\.js$/
-const staticInjectMarkerRE = /\b(const _hoisted_\d+ = \/\*#__PURE__\*\/createStaticVNode)\("(.*)", (\d+)\)/g
+const staticInjectMarkerRE =
+  /\b(const _hoisted_\d+ = \/\*#__PURE__\*\/createStaticVNode)\("(.*)", (\d+)\)/g
 const staticStripRE = /__VP_STATIC_START__.*?__VP_STATIC_END__/g
 const staticRestoreRE = /__VP_STATIC_(START|END)__/g
 
@@ -24,7 +25,15 @@ const isPageChunk = (
 
 export function createVitePressPlugin(
   root: string,
-  { configPath, alias, markdown, site, vueOptions, pages }: SiteConfig,
+  {
+    configPath,
+    alias,
+    markdown,
+    site,
+    vue: userVuePluginOptions,
+    vite: userViteConfig,
+    pages
+  }: SiteConfig,
   ssr = false,
   pageToHashMap?: Record<string, string>
 ): Plugin[] {
@@ -32,7 +41,7 @@ export function createVitePressPlugin(
 
   const vuePlugin = createVuePlugin({
     include: [/\.vue$/, /\.md$/],
-    ...vueOptions
+    ...userVuePluginOptions
   })
 
   let siteData = site
@@ -47,7 +56,7 @@ export function createVitePressPlugin(
     },
 
     config() {
-      return {
+      const baseConfig = {
         resolve: {
           alias
         },
@@ -60,6 +69,9 @@ export function createVitePressPlugin(
           exclude: ['@docsearch/js']
         }
       }
+      return userViteConfig
+        ? mergeConfig(userViteConfig, baseConfig)
+        : baseConfig
     },
 
     resolveId(id) {