add steep

Gemfile

@@ -18,4 +18,8 @@ group :development do
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'
   gem 'spring-watcher-listen', '~> 2.0.0'
+
+  gem 'steep', require: false
+  gem 'rbs', require: false
+  gem 'rbs_rails', require: false
 end

Gemfile.lock

@@ -86,6 +86,10 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
+    ast (2.4.1)
+    ast_utils (0.3.0)
+      parser (~> 2.4)
+      thor (>= 0.19)
     bootsnap (1.5.1)
       msgpack (~> 1.0)
     builder (3.2.4)
@@ -97,6 +101,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.8.5)
       concurrent-ruby (~> 1.0)
+    language_server-protocol (3.15.0.1)
     listen (3.3.3)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -116,6 +121,8 @@ GEM
     nio4r (2.5.4)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
+    parser (2.7.2.0)
+      ast (~> 2.4.1)
     pg (1.2.3)
     puma (5.1.1)
       nio4r (~> 2.0)
@@ -127,10 +134,15 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.3.0)
       loofah (~> 2.3)
+    rainbow (3.0.0)
     rake (13.0.3)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    rbs (1.0.0)
+    rbs_rails (0.7.0)
+      parser
+      rbs (>= 1)
     spring (2.1.1)
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
@@ -142,6 +154,14 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
+    steep (0.39.0)
+      activesupport (>= 5.1)
+      ast_utils (~> 0.3.0)
+      language_server-protocol (~> 3.15.0.1)
+      listen (~> 3.0)
+      parser (~> 2.7.0)
+      rainbow (>= 2.2.2, < 4.0)
+      rbs (~> 1.0.0)
     thor (1.0.1)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
@@ -159,8 +179,11 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   puma
   rails!
+  rbs
+  rbs_rails
   spring
   spring-watcher-listen (~> 2.0.0)
+  steep
 
 RUBY VERSION
    ruby 3.0.0p0