v4.0.0 (#1719)

Release branch for 4.0.0.

client/scripts/check-gl-split.mjs

@@ -0,0 +1,47 @@
+import { readdirSync, readFileSync, statSync } from 'node:fs'
+import { join } from 'node:path'
+
+/**
+ * Fails when a built chunk contains both WebGL map engines.
+ *
+ * mapbox-gl and maplibre-gl used to be static imports in the same three
+ * components, so rollup emitted a single 2.8 MB chunk carrying both. Every map
+ * user downloaded 1.8 MB of mapbox plus 1.1 MB of maplibre and ran one of them.
+ * A stray static import anywhere in the map tree brings that straight back, and
+ * nothing else would notice — the build stays green and the app still works.
+ *
+ * The markers are chosen to appear only inside the SDKs themselves, verified in
+ * node_modules. Do NOT test for the bare string "maplibre": the provider value
+ * 'maplibre-gl' and the setting key maplibre_style also appear in app code, so it
+ * matches the shared core chunk too.
+ */
+const DIR = 'dist/assets'
+const MAPBOX = 'events.mapbox.com' // 1 hit in mapbox-gl, 0 in maplibre-gl
+const MAPLIBRE = 'maplibregl-canvas' // 2 hits in maplibre-gl, 0 in mapbox-gl
+
+let mixed = 0
+let found = 0
+
+for (const file of readdirSync(DIR).filter(f => f.endsWith('.js'))) {
+  const path = join(DIR, file)
+  const src = readFileSync(path, 'utf8')
+  const hasMapbox = src.includes(MAPBOX)
+  const hasMaplibre = src.includes(MAPLIBRE)
+  if (!hasMapbox && !hasMaplibre) continue
+
+  found++
+  const size = statSync(path).size
+  if (hasMapbox && hasMaplibre) {
+    console.error(`FAIL  both GL engines in one chunk: ${file} (${size} B)`)
+    mixed++
+  } else {
+    console.log(`${hasMapbox ? 'mapbox  ' : 'maplibre'}  ${file}  ${size} B`)
+  }
+}
+
+if (!found) {
+  console.error('FAIL  no chunk contains either GL engine — did the build run?')
+  process.exit(1)
+}
+
+process.exit(mixed ? 1 : 0)