From c2b685c0dce421a6c6e4b33e1020ca84321b0dd8 Mon Sep 17 00:00:00 2001
From: Kirill <mpak8501@yandex.ru>
Date: Sun, 24 May 2026 19:38:40 +0500
Subject: [PATCH] perf: code-split maplibre-gl in AboutPage

---
 client/src/pages/about/ui/AboutMap.tsx  | 107 ++++++++++++++++++++++++
 client/src/pages/about/ui/AboutPage.tsx |  54 +-----------
 2 files changed, 109 insertions(+), 52 deletions(-)
 create mode 100644 client/src/pages/about/ui/AboutMap.tsx

diff --git a/client/src/pages/about/ui/AboutMap.tsx b/client/src/pages/about/ui/AboutMap.tsx
new file mode 100644
index 0000000..16693f9
--- /dev/null
+++ b/client/src/pages/about/ui/AboutMap.tsx
@@ -0,0 +1,107 @@
+import { useEffect, useState } from 'react'
+import Box from '@mui/material/Box'
+import CircularProgress from '@mui/material/CircularProgress'
+import Map, { Marker } from 'react-map-gl/maplibre'
+import type * as maplibregl from 'maplibre-gl'
+
+let maplibreglPromise: Promise<typeof maplibregl> | null = null
+
+function loadMaplibre() {
+  if (!maplibreglPromise) {
+    maplibreglPromise = Promise.all([
+      import('maplibre-gl'),
+      import('maplibre-gl/dist/maplibre-gl.css'),
+    ]).then(([mod]) => mod)
+  }
+  return maplibreglPromise
+}
+
+const rasterStyle = {
+  version: 8 as const,
+  sources: {
+    osm: {
+      type: 'raster' as const,
+      tiles: ['https://tile.openstreetmap.org/{z}/{x}/{y}.png'],
+      tileSize: 256,
+      attribution: '© OpenStreetMap contributors',
+    },
+  },
+  layers: [{ id: 'osm', type: 'raster' as const, source: 'osm' }],
+}
+
+type AboutMapProps = {
+  lat: number
+  lng: number
+}
+
+export function AboutMap({ lat, lng }: AboutMapProps) {
+  const [maplibre, setMaplibre] = useState<typeof maplibregl | null>(null)
+
+  useEffect(() => {
+    let cancelled = false
+    loadMaplibre().then((mod) => {
+      if (!cancelled) setMaplibre(mod)
+    })
+    return () => {
+      cancelled = true
+    }
+  }, [])
+
+  if (!maplibre) {
+    return (
+      <Box
+        sx={{
+          height: 380,
+          borderRadius: 2,
+          border: 1,
+          borderColor: 'divider',
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'center',
+        }}
+      >
+        <CircularProgress size={24} />
+      </Box>
+    )
+  }
+
+  return (
+    <Box
+      sx={{
+        height: 380,
+        borderRadius: 2,
+        overflow: 'hidden',
+        border: 1,
+        borderColor: 'divider',
+        position: 'relative',
+      }}
+    >
+      <Map
+        mapLib={maplibre}
+        initialViewState={{ latitude: lat, longitude: lng, zoom: 15 }}
+        style={{ width: '100%', height: 380 }}
+        mapStyle={rasterStyle}
+        scrollZoom={false}
+        dragRotate={false}
+        dragPan={false}
+        doubleClickZoom={false}
+        keyboard={false}
+        touchZoomRotate={false}
+      >
+        <Marker longitude={lng} latitude={lat} anchor="bottom">
+          <Box
+            sx={{
+              width: 20,
+              height: 20,
+              bgcolor: 'primary.main',
+              borderRadius: '50%',
+              border: 2,
+              borderColor: 'background.paper',
+              boxShadow: 3,
+            }}
+          />
+        </Marker>
+      </Map>
+    </Box>
+  )
+}
diff --git a/client/src/pages/about/ui/AboutPage.tsx b/client/src/pages/about/ui/AboutPage.tsx
index 1e2e25b..7a31de1 100644
--- a/client/src/pages/about/ui/AboutPage.tsx
+++ b/client/src/pages/about/ui/AboutPage.tsx
@@ -3,24 +3,10 @@ import Link from '@mui/material/Link'
 import Paper from '@mui/material/Paper'
 import Stack from '@mui/material/Stack'
 import Typography from '@mui/material/Typography'
-import * as maplibregl from 'maplibre-gl'
-import Map, { Marker } from 'react-map-gl/maplibre'
 import { STORE_EMAIL, STORE_PHONE, VK_URL } from '@/shared/config'
 import { PICKUP_ADDRESS_FULL, PICKUP_COORDINATES } from '@/shared/constants/pickup-point'
 import { usePageTitle } from '@/shared/lib/use-page-title'
-
-const rasterStyle = {
-  version: 8 as const,
-  sources: {
-    osm: {
-      type: 'raster' as const,
-      tiles: ['https://tile.openstreetmap.org/{z}/{x}/{y}.png'],
-      tileSize: 256,
-      attribution: '© OpenStreetMap contributors',
-    },
-  },
-  layers: [{ id: 'osm', type: 'raster' as const, source: 'osm' }],
-}
+import { AboutMap } from './AboutMap'
 
 export function AboutPage() {
   usePageTitle('О нас')
@@ -63,43 +49,7 @@ export function AboutPage() {
           </Typography>
         </Paper>
 
-        <Box
-          sx={{
-            height: 380,
-            borderRadius: 2,
-            overflow: 'hidden',
-            border: 1,
-            borderColor: 'divider',
-            position: 'relative',
-          }}
-        >
-          <Map
-            mapLib={maplibregl}
-            initialViewState={{ latitude: lat, longitude: lng, zoom: 15 }}
-            style={{ width: '100%', height: 380 }}
-            mapStyle={rasterStyle}
-            scrollZoom={false}
-            dragRotate={false}
-            dragPan={false}
-            doubleClickZoom={false}
-            keyboard={false}
-            touchZoomRotate={false}
-          >
-            <Marker longitude={lng} latitude={lat} anchor="bottom">
-              <Box
-                sx={{
-                  width: 20,
-                  height: 20,
-                  bgcolor: 'primary.main',
-                  borderRadius: '50%',
-                  border: 2,
-                  borderColor: 'background.paper',
-                  boxShadow: 3,
-                }}
-              />
-            </Marker>
-          </Map>
-        </Box>
+        <AboutMap lat={lat} lng={lng} />
       </Stack>
     </Box>
   )