Allows preload to be determined by provided entry_point

app/helpers/importmap/importmap_tags_helper.rb

@@ -3,7 +3,7 @@ module Importmap::ImportmapTagsHelper
   def javascript_importmap_tags(entry_point = "application", importmap: Rails.application.importmap)
     safe_join [
       javascript_inline_importmap_tag(importmap.to_json(resolver: self)),
-      javascript_importmap_module_preload_tags(importmap),
+      javascript_importmap_module_preload_tags(importmap, entry_point:),
       javascript_import_module_tag(entry_point)
     ], "\n"
   end
@@ -24,8 +24,8 @@ def javascript_import_module_tag(*module_names)
   # Link tags for preloading all modules marked as preload: true in the `importmap`
   # (defaults to Rails.application.importmap), such that they'll be fetched
   # in advance by browsers supporting this link type (https://caniuse.com/?search=modulepreload).
-  def javascript_importmap_module_preload_tags(importmap = Rails.application.importmap)
-    javascript_module_preload_tag(*importmap.preloaded_module_paths(resolver: self))
+  def javascript_importmap_module_preload_tags(importmap = Rails.application.importmap, entry_point:)
+    javascript_module_preload_tag(*importmap.preloaded_module_paths(resolver: self, entry_point:))
   end
 
   # Link tag(s) for preloading the JavaScript module residing in `*paths`. Will return one link tag per path element.

lib/importmap/map.rb

@@ -40,9 +40,9 @@ def pin_all_from(dir, under: nil, to: nil, preload: true)
   # resolver that has been configured for the `asset_host` you want these resolved paths to use. In case you need to
   # resolve for different asset hosts, you can pass in a custom `cache_key` to vary the cache used by this method for
   # the different cases.
-  def preloaded_module_paths(resolver:, cache_key: :preloaded_module_paths)
+  def preloaded_module_paths(resolver:, entry_point:, cache_key: :preloaded_module_paths)
     cache_as(cache_key) do
-      resolve_asset_paths(expanded_preloading_packages_and_directories, resolver: resolver).values
+      resolve_asset_paths(expanded_preloading_packages_and_directories(entry_point:), resolver:).values
     end
   end
 
@@ -118,8 +118,8 @@ def resolve_asset_paths(paths, resolver:)
       end.compact
     end
 
-    def expanded_preloading_packages_and_directories
-      expanded_packages_and_directories.select { |name, mapping| mapping.preload }
+    def expanded_preloading_packages_and_directories(entry_point:)
+      expanded_packages_and_directories.select { |name, mapping| mapping.preload == true || (mapping.preload & Array(entry_point)).any? }
     end
 
     def expanded_packages_and_directories