add importmap

Gemfile

@@ -54,3 +54,5 @@ end
 gem "jsbundling-rails", "~> 1.0"
 
 gem "cssbundling-rails", "~> 1.1"
+
+gem "importmap-rails", "~> 1.1"

Gemfile.lock

@@ -140,6 +140,9 @@ GEM
       multi_xml (>= 0.5.2)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
+    importmap-rails (1.1.5)
+      actionpack (>= 6.0.0)
+      railties (>= 6.0.0)
     io-console (0.5.11)
     io-wait (0.2.0)
     irb (1.4.2)
@@ -327,6 +330,7 @@ DEPENDENCIES
   guard-rspec
   haml-rails
   high_voltage (~> 3.1)
+  importmap-rails (~> 1.1)
   io-wait (= 0.2.0)
   jsbundling-rails (~> 1.0)
   mina
@@ -350,4 +354,4 @@ RUBY VERSION
    ruby 3.0.4p208
 
 BUNDLED WITH
-   2.3.9
+   2.3.26

app/assets/config/manifest.js

@@ -1,2 +1,4 @@
 //= link_tree ../images
 //= link_tree ../builds
+//= link_tree ../../javascript .js
+//= link_tree ../../../vendor/javascript .js

app/javascript/application.js

@@ -0,0 +1 @@
+// Configure your import map in config/importmap.rb. Read more: https://github.com/rails/importmap-rails

config/importmap.rb

@@ -0,0 +1,3 @@
+# Pin npm packages by running ./bin/importmap
+
+pin "application", preload: true