diff --git a/assets/js/leaflet-global.js b/assets/js/leaflet-global.js
new file mode 100644
index 0000000..07b2622
--- /dev/null
+++ b/assets/js/leaflet-global.js
@@ -0,0 +1,7 @@
+// Sets window.L from the imported leaflet module.
+// Required because esbuild bundles everything in a "use strict" IIFE,
+// causing the leaflet UMD to take the CommonJS path instead of setting
+// window.leaflet. Plugins and hooks expect window.L to exist.
+import * as leafletModule from "../vendor/js/leaflet-minimal.js";
+
+window.L = leafletModule;
diff --git a/assets/js/map-bundle-entry.js b/assets/js/map-bundle-entry.js
index 5bda1cb..a8ff395 100644
--- a/assets/js/map-bundle-entry.js
+++ b/assets/js/map-bundle-entry.js
@@ -1,11 +1,9 @@
-// Map bundle entry point - combines Leaflet and map plugins
-import "../vendor/js/leaflet-minimal.js";
+// Map bundle entry point — combines Leaflet and map plugins.
+//
+// ESM evaluates side-effect imports in source order, so leaflet-global.js
+// runs (and sets window.L) before plugins-optimized.js, which references L.
+import "./leaflet-global.js";
 import "../vendor/js/plugins-optimized.js";
 
-// Ensure Leaflet is available as window.L (standard convention)
-if (window.leaflet && !window.L) {
-  window.L = window.leaflet;
-}
-
 // Mark bundle as loaded
-window.mapBundleLoaded = true;
\ No newline at end of file
+window.mapBundleLoaded = true;