From 47e43deda1e37b0ae4bf9a7e3cd80c839c506340 Mon Sep 17 00:00:00 2001
From: Alexander Momchilov <alexander.momchilov@shopify.com>
Date: Wed, 1 Apr 2026 15:47:17 -0400
Subject: [PATCH] Make Config attributes read-only

---
 lib/spoom/coverage.rb             |  2 +-
 lib/spoom/sorbet/config.rb        | 47 +++++++++++++++++++------------
 rbi/spoom.rbi                     | 17 +++++------
 test/spoom/context/sorbet_test.rb |  3 +-
 4 files changed, 40 insertions(+), 29 deletions(-)

diff --git a/lib/spoom/coverage.rb b/lib/spoom/coverage.rb
index 6079f976..a82c241a 100644
--- a/lib/spoom/coverage.rb
+++ b/lib/spoom/coverage.rb
@@ -100,7 +100,7 @@ def report(context, snapshots, palette:)
       #: (Context context) -> FileTree
       def file_tree(context)
         config = context.sorbet_config
-        config.ignore += ["test"]
+        config.ignore << "test"
 
         files = context.srb_files(with_config: config, include_rbis: false)
         FileTree.new(files)
diff --git a/lib/spoom/sorbet/config.rb b/lib/spoom/sorbet/config.rb
index 14b15ce5..389e7a71 100644
--- a/lib/spoom/sorbet/config.rb
+++ b/lib/spoom/sorbet/config.rb
@@ -27,17 +27,17 @@ class Config
       DEFAULT_ALLOWED_EXTENSIONS = [".rb", ".rbi"].freeze #: Array[String]
 
       #: Array[String]
-      attr_accessor :paths, :ignore, :allowed_extensions
+      attr_reader :paths, :ignore, :allowed_extensions
 
       #: bool
-      attr_accessor :no_stdlib
+      attr_reader :no_stdlib
 
-      #: -> void
-      def initialize
-        @paths = [] #: Array[String]
-        @ignore = [] #: Array[String]
-        @allowed_extensions = [] #: Array[String]
-        @no_stdlib = false #: bool
+      #: (?paths: Array[String], ?ignore: Array[String], ?allowed_extensions: Array[String], ?no_stdlib: bool) -> void
+      def initialize(paths: [], ignore: [], allowed_extensions: [], no_stdlib: false)
+        @paths = paths
+        @ignore = ignore
+        @allowed_extensions = allowed_extensions
+        @no_stdlib = no_stdlib
       end
 
       #: (Config source) -> void
@@ -78,8 +78,13 @@ def parse_file(sorbet_config_path)
 
         #: (String sorbet_config) -> Spoom::Sorbet::Config
         def parse_string(sorbet_config)
-          config = Config.new
+          paths = [] #: Array[String]
+          ignore = [] #: Array[String]
+          allowed_extensions = [] #: Array[String]
+          no_stdlib = false #: bool
+
           state = nil #: Symbol?
+
           sorbet_config.each_line do |line|
             line = line.strip
             case line
@@ -87,26 +92,26 @@ def parse_string(sorbet_config)
               state = :extension
               next
             when /^--allowed-extension=/
-              config.allowed_extensions << parse_option(line)
+              allowed_extensions << parse_option(line)
               next
             when /^--ignore$/
               state = :ignore
               next
             when /^--ignore=/
-              config.ignore << parse_option(line)
+              ignore << parse_option(line)
               next
             when /^--file$/
               next
             when /^--file=/
-              config.paths << parse_option(line)
+              paths << parse_option(line)
               next
             when /^--dir$/
               next
             when /^--dir=/
-              config.paths << parse_option(line)
+              paths << parse_option(line)
               next
             when /^--no-stdlib(=|$)/
-              config.no_stdlib = parse_bool_option(line)
+              no_stdlib = parse_bool_option(line)
               next
             when /^--.*=/
               next
@@ -121,18 +126,24 @@ def parse_string(sorbet_config)
             else
               case state
               when :ignore
-                config.ignore << line
+                ignore << line
               when :extension
-                config.allowed_extensions << line
+                allowed_extensions << line
               when :skip
                 # nothing
               else
-                config.paths << line
+                paths << line
               end
               state = nil
             end
           end
-          config
+
+          Config.new(
+            paths:,
+            ignore:,
+            allowed_extensions:,
+            no_stdlib:,
+          )
         end
 
         private
diff --git a/rbi/spoom.rbi b/rbi/spoom.rbi
index 10d9b27c..ac505dbb 100644
--- a/rbi/spoom.rbi
+++ b/rbi/spoom.rbi
@@ -2598,27 +2598,28 @@ Spoom::Sorbet::BIN_PATH = T.let(T.unsafe(nil), String)
 Spoom::Sorbet::CONFIG_PATH = T.let(T.unsafe(nil), String)
 
 class Spoom::Sorbet::Config
-  sig { void }
-  def initialize; end
+  sig do
+    params(
+      paths: T::Array[::String],
+      ignore: T::Array[::String],
+      allowed_extensions: T::Array[::String],
+      no_stdlib: T::Boolean
+    ).void
+  end
+  def initialize(paths: T.unsafe(nil), ignore: T.unsafe(nil), allowed_extensions: T.unsafe(nil), no_stdlib: T.unsafe(nil)); end
 
   def allowed_extensions; end
-  def allowed_extensions=(_arg0); end
   def ignore; end
-  def ignore=(_arg0); end
 
   sig { returns(T::Boolean) }
   def no_stdlib; end
 
-  def no_stdlib=(_arg0); end
-
   sig { returns(::String) }
   def options_string; end
 
   sig { returns(T::Array[::String]) }
   def paths; end
 
-  def paths=(_arg0); end
-
   private
 
   sig { params(source: ::Spoom::Sorbet::Config).void }
diff --git a/test/spoom/context/sorbet_test.rb b/test/spoom/context/sorbet_test.rb
index 6c9cf89f..cca20d27 100644
--- a/test/spoom/context/sorbet_test.rb
+++ b/test/spoom/context/sorbet_test.rb
@@ -367,8 +367,7 @@ def test_context_srb_files_with_custom_config
         context.write!("h.js", "")
         context.write!("i", "")
 
-        config = Spoom::Sorbet::Config.new
-        config.paths = ["b", "d"]
+        config = Spoom::Sorbet::Config.new(paths: ["b", "d"])
 
         assert_equal(["b/c.rb", "d/e/f.rbi"], context.srb_files(with_config: config))