fix: lazy load @vue/server-render for production build

src/node/build/build.ts

@@ -14,6 +14,7 @@ export type BuildOptions = Pick<
 >
 
 export async function build(buildOptions: BuildOptions = {}) {
+  process.env.NODE_ENV = 'production'
   const siteConfig = await resolveConfig(buildOptions.root)
   try {
     const [clientResult, , pageToHashMap] = await bundle(

src/node/build/render.ts

@@ -3,7 +3,6 @@ import fs from 'fs-extra'
 import { SiteConfig } from '../config'
 import { HeadConfig } from '../../../types/shared'
 import { BuildResult } from 'vite'
-import { renderToString } from '@vue/server-renderer'
 import { OutputChunk, OutputAsset } from 'rollup'
 
 const escape = require('escape-html')
@@ -21,7 +20,8 @@ export async function renderPage(
   const { app, router } = createApp()
   const routePath = `/${page.replace(/\.md$/, '')}`
   router.go(routePath)
-  const content = await renderToString(app)
+  // lazy require server-renderer for production build
+  const content = await require('@vue/server-renderer').renderToString(app)
 
   const pageName = page.replace(/\//g, '_')
   // server build doesn't need hash