Merge remote-tracking branch 'upstream/main'

frontend/node_modules/eventsource/example/sse-server.js

@@ -0,0 +1,29 @@
+const express = require('express')
+const serveStatic = require('serve-static')
+const SseStream = require('ssestream')
+
+const app = express()
+app.use(serveStatic(__dirname))
+app.get('/sse', (req, res) => {
+  console.log('new connection')
+
+  const sseStream = new SseStream(req)
+  sseStream.pipe(res)
+  const pusher = setInterval(() => {
+    sseStream.write({
+      event: 'server-time',
+      data: new Date().toTimeString()
+    })
+  }, 1000)
+
+  res.on('close', () => {
+    console.log('lost connection')
+    clearInterval(pusher)
+    sseStream.unpipe(res)
+  })
+})
+
+app.listen(8080, (err) => {
+  if (err) throw err
+  console.log('server ready on http://localhost:8080')
+})