feat: add SseProvider — SSE to ReactQuery bridge with tests

client/src/app/providers/SseProvider.tsx

@@ -0,0 +1,83 @@
+import { useEffect, useRef } from 'react'
+import { useQueryClient } from '@tanstack/react-query'
+import { useUnit } from 'effector-react'
+import { createEventStream } from '@/shared/lib/sse'
+import { $token } from '@/shared/model/auth'
+
+export function SseProvider() {
+  const token = useUnit($token)
+  const queryClient = useQueryClient()
+  const sourceRef = useRef<EventSource | null>(null)
+
+  useEffect(() => {
+    if (!token) {
+      if (sourceRef.current) {
+        sourceRef.current.close()
+        sourceRef.current = null
+      }
+      return
+    }
+
+    const es = createEventStream(token)
+    sourceRef.current = es
+
+    function handleEvent(eventName: string) {
+      return function (event: MessageEvent) {
+        try {
+          const data = JSON.parse(event.data)
+          const orderId = data.orderId
+
+          switch (eventName) {
+            case 'message:new':
+              queryClient.invalidateQueries({ queryKey: ['me', 'messages', 'unread-count'] })
+              queryClient.invalidateQueries({ queryKey: ['me', 'conversations'] })
+              if (orderId) {
+                queryClient.invalidateQueries({ queryKey: ['me', 'orders', orderId] })
+                queryClient.invalidateQueries({ queryKey: ['admin', 'orders', orderId] })
+              }
+              break
+            case 'order:statusChanged':
+              if (orderId) {
+                queryClient.invalidateQueries({ queryKey: ['me', 'orders', orderId] })
+                queryClient.invalidateQueries({ queryKey: ['admin', 'orders', orderId] })
+              }
+              break
+            case 'order:updated':
+              if (orderId) {
+                queryClient.invalidateQueries({ queryKey: ['me', 'orders', orderId] })
+                queryClient.invalidateQueries({ queryKey: ['admin', 'orders', orderId] })
+              }
+              break
+            case 'order:new':
+              queryClient.invalidateQueries({ queryKey: ['admin', 'orders', 'summary'] })
+              queryClient.invalidateQueries({ queryKey: ['admin', 'orders'] })
+              break
+          }
+        } catch {
+          // ignore parse errors (e.g. heartbit comments)
+        }
+      }
+    }
+
+    const messageNewHandler = handleEvent('message:new')
+    const orderStatusHandler = handleEvent('order:statusChanged')
+    const orderUpdatedHandler = handleEvent('order:updated')
+    const orderNewHandler = handleEvent('order:new')
+
+    es.addEventListener('message:new', messageNewHandler)
+    es.addEventListener('order:statusChanged', orderStatusHandler)
+    es.addEventListener('order:updated', orderUpdatedHandler)
+    es.addEventListener('order:new', orderNewHandler)
+
+    return () => {
+      es.removeEventListener('message:new', messageNewHandler)
+      es.removeEventListener('order:statusChanged', orderStatusHandler)
+      es.removeEventListener('order:updated', orderUpdatedHandler)
+      es.removeEventListener('order:new', orderNewHandler)
+      es.close()
+      sourceRef.current = null
+    }
+  }, [token, queryClient])
+
+  return null
+}