Revert "Re-enable support for Ruby 2.7"

This reverts commit 32d9911.

Author: jhawthorn

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, entry_point: entry_point),
+      javascript_importmap_module_preload_tags(importmap, entry_point:),
       javascript_import_module_tag(entry_point)
     ], "\n"
   end
@@ -25,7 +25,7 @@ def javascript_import_module_tag(*module_names)
   # (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, entry_point: "application")
-    javascript_module_preload_tag(*importmap.preloaded_module_paths(resolver: self, entry_point: entry_point, cache_key: entry_point))
+    javascript_module_preload_tag(*importmap.preloaded_module_paths(resolver: self, entry_point:, cache_key: entry_point))
   end
 
   # Link tag(s) for preloading the JavaScript module residing in `*paths`. Will return one link tag per path element.

importmap-rails.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
 
   spec.files = Dir["{app,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
 
-  spec.required_ruby_version = ">= 2.7.0"
+  spec.required_ruby_version = ">= 3.1.0"
   spec.add_dependency "railties", ">= 6.0.0"
   spec.add_dependency "activesupport", ">= 6.0.0"
   spec.add_dependency "actionpack", ">= 6.0.0"

lib/importmap/map.rb

@@ -42,7 +42,7 @@ def pin_all_from(dir, under: nil, to: nil, preload: true)
   # the different cases.
   def preloaded_module_paths(resolver:, entry_point: "application", cache_key: :preloaded_module_paths)
     cache_as(cache_key) do
-      resolve_asset_paths(expanded_preloading_packages_and_directories(entry_point: entry_point), resolver: resolver).values
+      resolve_asset_paths(expanded_preloading_packages_and_directories(entry_point:), resolver:).values
     end
   end