fix(hmr): don't load config twice on server restart

src/node/cli.ts

@@ -1,9 +1,16 @@
 import minimist from 'minimist'
 import c from 'picocolors'
 import { createLogger, type Logger } from 'vite'
-import { build, createServer, serve } from '.'
+import {
+  build,
+  createServer,
+  disposeMdItInstance,
+  resolveConfig,
+  serve
+} from '.'
 import { version } from '../../package.json'
 import { init } from './init/init'
+import { clearCache } from './markdownToVue'
 import { bindShortcuts } from './shortcuts'
 
 if (process.env.DEBUG) {
@@ -40,30 +47,38 @@ if (!command || command === 'dev') {
     argv.optimizeDeps = { force: true }
   }
 
+  let config = await resolveConfig(root, argv).catch(
+    logErrorAndExit.bind(null, `failed to resolve config. error:`)
+  )
   const createDevServer = async (isRestart = true) => {
-    const server = await createServer(root, argv, async () => {
+    const server = await createServer(root, argv, restartServer, config)
+    function restartServer() {
       if (!restartPromise) {
         restartPromise = (async () => {
+          try {
+            config = await resolveConfig(root, argv)
+          } catch (err: any) {
+            logError(`failed to resolve config. error:`, err)
+            return
+          }
+          disposeMdItInstance()
+          clearCache()
           await server.close()
           await createDevServer()
         })().finally(() => {
           restartPromise = undefined
         })
       }
-
       return restartPromise
-    })
+    }
     await server.listen(undefined, isRestart)
     logVersion(server.config.logger)
     server.printUrls()
-    bindShortcuts(server, createDevServer)
+    bindShortcuts(server, restartServer)
   }
-  createDevServer(false).catch((err) => {
-    createLogger().error(
-      `${c.red(`failed to start server. error:`)}\n${err.message}\n${err.stack}`
-    )
-    process.exit(1)
-  })
+  createDevServer(false).catch(
+    logErrorAndExit.bind(null, `failed to start server. error:`)
+  )
 } else if (command === 'init') {
   createLogger().info('', { clear: true })
   init(argv.root)
@@ -74,21 +89,30 @@ if (!command || command === 'dev') {
       onAfterConfigResolve(siteConfig) {
         logVersion(siteConfig.logger)
       }
-    }).catch((err) => {
-      createLogger().error(
-        `${c.red(`build error:`)}\n${err.message}\n${err.stack}`
-      )
-      process.exit(1)
-    })
+    }).catch(logErrorAndExit.bind(null, `build error:`))
   } else if (command === 'serve' || command === 'preview') {
-    serve(argv).catch((err) => {
-      createLogger().error(
-        `${c.red(`failed to start server. error:`)}\n${err.message}\n${err.stack}`
-      )
-      process.exit(1)
-    })
+    serve(argv).catch(
+      logErrorAndExit.bind(null, `failed to start server. error:`)
+    )
   } else {
-    createLogger().error(c.red(`unknown command "${command}".`))
-    process.exit(1)
+    logErrorAndExit(`unknown command "${command}".`)
   }
 }
+
+function logErrorAndExit(message: string, err?: any): never {
+  logError(message, err)
+  process.exit(1)
+}
+
+function logError(message: string, err?: any) {
+  const logger = createLogger()
+  logger.error(
+    [
+      c.red(message),
+      err && 'message' in err && err.message,
+      err && 'stack' in err && err.stack
+    ]
+      .filter(Boolean)
+      .join('\n')
+  )
+}

src/node/plugin.ts

@@ -18,13 +18,7 @@ import {
   SITE_DATA_REQUEST_PATH,
   resolveAliases
 } from './alias'
-import {
-  isAdditionalConfigFile,
-  resolvePages,
-  resolveUserConfig,
-  type SiteConfig
-} from './config'
-import { disposeMdItInstance } from './markdown/markdown'
+import { isAdditionalConfigFile, resolvePages, type SiteConfig } from './config'
 import {
   clearCache,
   createMarkdownToVueRenderFn,
@@ -76,7 +70,7 @@ export async function createVitePressPlugin(
   ssr = false,
   pageToHashMap?: Record<string, string>,
   clientJSMap?: Record<string, string>,
-  recreateServer?: () => Promise<void>
+  restartServer?: () => Promise<void>
 ) {
   const {
     srcDir,
@@ -354,18 +348,6 @@ export async function createVitePressPlugin(
       if (this.environment.name !== 'client') return
       const relativePath = path.posix.relative(srcDir, file)
 
-      if (themeRE.test(relativePath) && type !== 'update') {
-        siteConfig.themeDir =
-          type === 'create' ? path.posix.dirname(file) : DEFAULT_THEME_PATH
-        siteConfig.logger.info(c.green('page reload ') + c.dim(relativePath), {
-          clear: true,
-          timestamp: true
-        })
-        this.environment.moduleGraph.invalidateAll()
-        this.environment.hot.send({ type: 'full-reload' })
-        return []
-      }
-
       // update pages, dynamicRoutes and rewrites on md file creation / deletion
       if (file.endsWith('.md') && type !== 'update') {
         await resolvePages(siteConfig)
@@ -387,17 +369,19 @@ export async function createVitePressPlugin(
           { clear: true, timestamp: true }
         )
 
-        try {
-          await resolveUserConfig(siteConfig.root, 'serve', 'development')
-        } catch (err: any) {
-          siteConfig.logger.error(err)
-          return
-        }
+        return restartServer?.()
+      }
 
-        disposeMdItInstance()
-        clearCache()
-        await recreateServer?.()
-        return
+      if (themeRE.test(relativePath) && type !== 'update') {
+        siteConfig.themeDir =
+          type === 'create' ? path.posix.dirname(file) : DEFAULT_THEME_PATH
+        siteConfig.logger.info(c.green('page reload ') + c.dim(relativePath), {
+          clear: true,
+          timestamp: true
+        })
+        this.environment.moduleGraph.invalidateAll()
+        this.environment.hot.send({ type: 'full-reload' })
+        return []
       }
     }
   }

src/node/server.ts

@@ -1,25 +1,24 @@
 import { createServer as createViteServer, type ServerOptions } from 'vite'
-import { resolveConfig } from './config'
+import { resolveConfig, type SiteConfig } from './config'
 import { createVitePressPlugin } from './plugin'
 
 export async function createServer(
-  root: string = process.cwd(),
+  root: string = process.cwd(), // for backwards compatibility
   serverOptions: ServerOptions & { base?: string } = {},
-  recreateServer?: () => Promise<void>
+  restartServer?: () => Promise<void>,
+  config?: SiteConfig // new code should pass config directly
 ) {
-  const config = await resolveConfig(root)
+  config ??= await resolveConfig(root)
 
-  if (serverOptions.base) {
-    config.site.base = serverOptions.base
-    delete serverOptions.base
-  }
+  const { base, ...server } = serverOptions
+  config.site.base = base ?? config.site.base
 
   return createViteServer({
     root: config.srcDir,
     base: config.site.base,
     cacheDir: config.cacheDir,
-    plugins: await createVitePressPlugin(config, false, {}, {}, recreateServer),
-    server: serverOptions,
+    plugins: await createVitePressPlugin(config, false, {}, {}, restartServer),
+    server,
     customLogger: config.logger,
     configFile: config.vite?.configFile
   })

src/node/shortcuts.ts

@@ -1,22 +1,19 @@
 import c from 'picocolors'
 import type { ViteDevServer } from 'vite'
-import { disposeMdItInstance } from './markdown/markdown'
-import { clearCache } from './markdownToVue'
-
-type CreateDevServer = () => Promise<void>
+import type { Awaitable } from './shared'
 
 export type CLIShortcut = {
   key: string
   description: string
   action(
     server: ViteDevServer,
-    createDevServer: CreateDevServer
-  ): void | Promise<void>
+    restartServer: () => Promise<void>
+  ): Awaitable<void>
 }
 
 export function bindShortcuts(
   server: ViteDevServer,
-  createDevServer: CreateDevServer
+  restartServer: () => Promise<void>
 ): void {
   if (!server.httpServer || !process.stdin.isTTY || process.env.CI) {
     return
@@ -59,7 +56,7 @@ export function bindShortcuts(
     if (!shortcut) return
 
     actionRunning = true
-    await shortcut.action(server, createDevServer)
+    await shortcut.action(server, restartServer)
     actionRunning = false
   }
 
@@ -77,15 +74,12 @@ const SHORTCUTS: CLIShortcut[] = [
   {
     key: 'r',
     description: 'restart the server',
-    async action(server, createDevServer) {
+    async action(server, restartServer) {
       server.config.logger.info(c.green(`restarting server...\n`), {
         clear: true,
         timestamp: true
       })
-      disposeMdItInstance()
-      clearCache()
-      await server.close()
-      await createDevServer()
+      await restartServer()
     }
   },
   {