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server.js
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server.js
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// @ts-check
const fs = require('fs')
const path = require('path')
const express = require('express')
const isTest = process.env.NODE_ENV === 'test' || !!process.env.VITE_TEST_BUILD
async function createServer(
root = process.cwd(),
isProd = process.env.NODE_ENV === 'production'
) {
const resolve = (p) => path.resolve(__dirname, p)
const indexProd = isProd
? fs.readFileSync(resolve('dist/client/index.html'), 'utf-8')
: ''
const prodManifest = isProd
? // @ts-ignore
require('./dist/client/ssr-manifest.json')
: {}
const app = express()
/**
* @type {import('vite').ViteDevServer}
*/
let vite
if (!isProd) {
vite = await require('vite').createServer({
root,
logLevel: isTest ? 'error' : 'info',
server: {
middlewareMode: 'ssr',
watch: {
// During tests we edit the files too fast and sometimes chokidar
// misses change events, so enforce polling for consistency
usePolling: true,
interval: 100
}
}
})
// use vite's connect instance as middleware
app.use(vite.middlewares)
} else {
app.use(require('compression')())
app.use(
require('serve-static')(resolve('dist/client'), {
index: false
})
)
}
app.use('*', async (req, res) => {
try {
const url = req.originalUrl
let template, render
if (!isProd) {
// always read fresh template in dev
template = fs.readFileSync(resolve('index.html'), 'utf-8')
template = await vite.transformIndexHtml(url, template)
render = (await vite.ssrLoadModule('/src/entry-server.js')).render
} else {
template = indexProd
render = require('./dist/server/entry-server.js').render
}
const [appHtml, modules] = await render(url)
function renderPreloadLinks(modules, manifest, isProd, idToCode) {
let links = ''
const seen = new Set()
modules.forEach((id) => {
const files = manifest[id]
if (files) {
files.forEach((file) => {
if (!seen.has(file)) {
seen.add(file)
links += isProd
? renderPreloadLinkProd(file)
: renderPreloadLinkDev(file, idToCode)
}
})
}
})
return links
}
function renderPreloadLinkProd(file) {
if (file.endsWith('.js')) {
return `<link rel="modulepreload" crossorigin href="${file}">`
} else if (file.endsWith('.css')) {
return `<link rel="stylesheet" href="${file}">`
} else {
// TODO
return ''
}
}
function renderPreloadLinkDev(file, idToCode) {
if (file.endsWith('.css') && idToCode[file]) {
return `<style>${idToCode[file]}</style>`
} else {
return ''
}
}
let preloadLinks = ''
let idToCode = {}
let manifest
if (isProd) {
manifest = prodManifest
} else {
function requireFromString(src) {
var Module = module.constructor
var m = new Module()
m._compile(src, '')
return m.exports
}
const manifestIdToModule = {}
vite.moduleGraph.idToModuleMap.forEach((module) => {
manifestIdToModule[module.id] = module
if (/.css$/.test(module.id)) {
if (module.transformResult?.code) {
const found = module.transformResult.code
.split(/\r?\n/)
.filter((line) => /^const css/.test(line))
if (found) {
idToCode[module.id] = requireFromString(
found[0] + '\nmodule.exports = css'
)
}
}
}
})
const devManifest = {}
Array.from(modules).forEach((moduleId) => {
devManifest[moduleId] = Array.from(
manifestIdToModule[moduleId].importedModules
).map((module) => module.id)
})
manifest = devManifest
}
preloadLinks = renderPreloadLinks(modules, manifest, isProd, idToCode)
const html = template
.replace(`<!--preload-links-->`, preloadLinks)
.replace(`<!--app-html-->`, appHtml)
res.status(200).set({ 'Content-Type': 'text/html' }).end(html)
} catch (e) {
vite && vite.ssrFixStacktrace(e)
console.log(e.stack)
res.status(500).end(e.stack)
}
})
return { app, vite }
}
if (!isTest) {
createServer().then(({ app }) =>
app.listen(3000, () => {
console.log('http://localhost:3000')
})
)
}
// for test use
exports.createServer = createServer