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index.js
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index.js
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// from https://vitejs.dev/guide/ssr.html#setting-up-the-dev-server
const fs = require('fs')
const path = require('path')
const express = require('express')
const { createServer: createViteServer } = require('vite')
async function createServer() {
const app = express()
// Create Vite server in middleware mode. This disables Vite's own HTML
// serving logic and let the parent server take control.
//
// If you want to use Vite's own HTML serving logic (using Vite as
// a development middleware), using 'html' instead.
const vite = await createViteServer({
server: { middlewareMode: 'ssr' }
})
// use vite's connect instance as middleware
app.use(vite.middlewares)
app.use('*', async (req, res, next) => {
const url = req.originalUrl;
if (url.includes('.')) {
return next();
}
try {
// 1. Read index.html
let template = fs.readFileSync(
path.resolve(__dirname,'..', 'index.html'),
'utf-8'
)
// 2. Apply Vite HTML transforms. This injects the Vite HMR client, and
// also applies HTML transforms from Vite plugins, e.g. global preambles
// from @vitejs/plugin-react-refresh
template = await vite.transformIndexHtml(url, template)
// 3. Load the server entry. vite.ssrLoadModule automatically transforms
// your ESM source code to be usable in Node.js! There is no bundling
// required, and provides efficient invalidation similar to HMR.
const { render } = await vite.ssrLoadModule('/src/entry-server.ts')
// 4. render the app HTML. This assumes entry-server.js's exported `render`
// function calls appropriate framework SSR APIs,
// e.g. ReactDOMServer.renderToString()
const appHtml = await render(url);
// 5. Inject the app-rendered HTML into the template.
const html = template.replace(`<!--ssr-outlet-->`, appHtml)
// 6. Send the rendered HTML back.
res.status(200).set({ 'Content-Type': 'text/html' }).end(html)
} catch (e) {
// If an error is caught, let Vite fix the stracktrace so it maps back to
// your actual source code.
vite.ssrFixStacktrace(e)
console.error(e)
res.status(500).end(e.message)
}
})
app.listen(3000)
}
createServer()