Nuxt/packages/vite/src/server.ts

import { resolve } from 'pathe'
import * as vite from 'vite'
import vuePlugin from '@vitejs/plugin-vue'
import viteJsxPlugin from '@vitejs/plugin-vue-jsx'
import { logger, resolvePath, tryResolveModule } from '@nuxt/kit'
import { joinURL, withTrailingSlash, withoutLeadingSlash } from 'ufo'
import type { ViteConfig } from '@nuxt/schema'
import type { ViteBuildContext } from './vite'
import { createViteLogger } from './utils/logger'
import { initViteNodeServer } from './vite-node'
import { writeManifest } from './manifest'
import { transpile } from './utils/transpile'

export async function buildServer (ctx: ViteBuildContext) {
  const helper = ctx.nuxt.options.nitro.imports !== false ? '' : 'globalThis.'
  const entry = ctx.nuxt.options.ssr ? ctx.entry : await resolvePath(resolve(ctx.nuxt.options.appDir, 'entry-spa'))
  const serverConfig: ViteConfig = vite.mergeConfig(ctx.config, vite.mergeConfig({
    configFile: false,
    base: ctx.nuxt.options.dev
      ? joinURL(ctx.nuxt.options.app.baseURL.replace(/^\.\//, '/') || '/', ctx.nuxt.options.app.buildAssetsDir)
      : undefined,
    experimental: {
      renderBuiltUrl: (filename, { type, hostType }) => {
        if (hostType !== 'js') {
          // In CSS we only use relative paths until we craft a clever runtime CSS hack
          return { relative: true }
        }
        if (type === 'public') {
          return { runtime: `${helper}__publicAssetsURL(${JSON.stringify(filename)})` }
        }
        if (type === 'asset') {
          const relativeFilename = filename.replace(withTrailingSlash(withoutLeadingSlash(ctx.nuxt.options.app.buildAssetsDir)), '')
          return { runtime: `${helper}__buildAssetsURL(${JSON.stringify(relativeFilename)})` }
        }
      }
    },
    css: {
      devSourcemap: !!ctx.nuxt.options.sourcemap.server
    },
    define: {
      'process.server': true,
      'process.client': false,
      'process.browser': false,
      'import.meta.server': true,
      'import.meta.client': false,
      'import.meta.browser': false,
      window: 'undefined',
      document: 'undefined',
      navigator: 'undefined',
      location: 'undefined',
      XMLHttpRequest: 'undefined'
    },
    optimizeDeps: {
      entries: ctx.nuxt.options.ssr ? [ctx.entry] : []
    },
    resolve: {
      alias: {
        '#build/plugins': resolve(ctx.nuxt.options.buildDir, 'plugins/server')
      }
    },
    ssr: {
      external: [
        '#internal/nitro', '#internal/nitro/utils'
      ],
      noExternal: [
        ...transpile({ isServer: true, isDev: ctx.nuxt.options.dev }),
        '/__vue-jsx',
        '#app',
        /^nuxt(\/|$)/,
        /(nuxt|nuxt3|nuxt-nightly)\/(dist|src|app)/
      ]
    },
    cacheDir: resolve(ctx.nuxt.options.rootDir, 'node_modules/.cache/vite', 'server'),
    build: {
      // we'll display this in nitro build output
      reportCompressedSize: false,
      sourcemap: ctx.nuxt.options.sourcemap.server ? ctx.config.build?.sourcemap ?? ctx.nuxt.options.sourcemap.server : false,
      outDir: resolve(ctx.nuxt.options.buildDir, 'dist/server'),
      ssr: true,
      rollupOptions: {
        input: { server: entry },
        external: ['#internal/nitro'],
        output: {
          entryFileNames: '[name].mjs',
          format: 'module',
          generatedCode: {
            constBindings: true
          }
        },
        onwarn (warning, rollupWarn) {
          if (warning.code && ['UNUSED_EXTERNAL_IMPORT'].includes(warning.code)) {
            return
          }
          rollupWarn(warning)
        }
      }
    },
    server: {
      // https://github.com/vitest-dev/vitest/issues/229#issuecomment-1002685027
      preTransformRequests: false,
      hmr: false
    }
  } satisfies vite.InlineConfig, ctx.nuxt.options.vite.$server || {}))

  if (!ctx.nuxt.options.dev) {
    const nitroDependencies = await tryResolveModule('nitropack/package.json', ctx.nuxt.options.modulesDir)
      .then(r => import(r!)).then(r => Object.keys(r.dependencies || {})).catch(() => [])
    ;(serverConfig.ssr!.external as string[])!.push(
      // explicit dependencies we use in our ssr renderer - these can be inlined (if necessary) in the nitro build
      'unhead', '@unhead/ssr', 'unctx', 'h3', 'devalue', '@nuxt/devalue', 'radix3', 'unstorage', 'hookable',
      // dependencies we might share with nitro - these can be inlined (if necessary) in the nitro build
      ...nitroDependencies
    )
  }

  serverConfig.customLogger = createViteLogger(serverConfig)

  await ctx.nuxt.callHook('vite:extendConfig', serverConfig, { isClient: false, isServer: true })

  serverConfig.plugins!.unshift(
    vuePlugin(serverConfig.vue),
    viteJsxPlugin(serverConfig.vueJsx)
  )

  await ctx.nuxt.callHook('vite:configResolved', serverConfig, { isClient: false, isServer: true })

  const onBuild = () => ctx.nuxt.callHook('vite:compiled')

  // Production build
  if (!ctx.nuxt.options.dev) {
    const start = Date.now()
    logger.info('Building server...')
    logger.restoreAll()
    await vite.build(serverConfig)
    logger.wrapAll()
    // Write production client manifest
    await writeManifest(ctx)
    await onBuild()
    logger.success(`Server built in ${Date.now() - start}ms`)
    return
  }

  // Write dev client manifest
  await writeManifest(ctx)

  if (!ctx.nuxt.options.ssr) {
    await onBuild()
    return
  }

  // Start development server
  const viteServer = await vite.createServer(serverConfig)
  ctx.ssrServer = viteServer

  await ctx.nuxt.callHook('vite:serverCreated', viteServer, { isClient: false, isServer: true })

  // Close server on exit
  ctx.nuxt.hook('close', () => viteServer.close())

  // Initialize plugins
  await viteServer.pluginContainer.buildStart({})

  if (ctx.config.devBundler !== 'legacy') {
    await initViteNodeServer(ctx)
  } else {
    logger.info('Vite server using legacy server bundler...')
    await import('./dev-bundler').then(r => r.initViteDevBundler(ctx, onBuild))
  }
}