diff --git a/lib/rbs/environment.rb b/lib/rbs/environment.rb
index e013c3529..605844fd3 100644
--- a/lib/rbs/environment.rb
+++ b/lib/rbs/environment.rb
@@ -11,6 +11,10 @@ class Environment
 
     attr_reader :sources
 
+    def declarations
+      sources.flat_map(&:declarations)
+    end
+
     class SingleEntry
       attr_reader :name
       attr_reader :context
diff --git a/sig/environment.rbs b/sig/environment.rbs
index 0d7e783aa..aaa4d447e 100644
--- a/sig/environment.rbs
+++ b/sig/environment.rbs
@@ -30,6 +30,9 @@ module RBS
     class GlobalEntry < SingleEntry[Symbol, AST::Declarations::Global]
     end
 
+    # Top level declarations
+    def declarations: () -> Array[AST::Ruby::Declarations::t | AST::Declarations::t]
+
     # Array of source objects loaded in the environment
     #
     attr_reader sources: Array[Source::t]