Use Thread.pass within TracePoint hook to improve REPL responce

Loading RBS could be heavy. It will frequently block main thread of IRB especially when IRB is loading RDoc.
Use TracePoint :call hook to pass thread execution while loading RBS will reduce main thread blocking.

Author: tompng

lib/repl_type_completor/types.rb

@@ -38,13 +38,15 @@ def self.load_rbs_builder
         end
       end
 
-      env = RBS::Environment.from_loader(loader)
-      # [Hack] Monkey patch for improving development experience
-      def env.resolve_declaration(*, **)
-        Thread.pass
-        super
+      # Hack to make this thread priority lower, not to block the main thread.
+      thread_pass_counter = 0
+      tracepoint = TracePoint.new(:call) do
+        Thread.pass if ((thread_pass_counter += 1) % 10).zero?
+      end
+      tracepoint.enable do
+        env = RBS::Environment.from_loader(loader)
+        @rbs_builder = RBS::DefinitionBuilder.new env: env.resolve_type_names
       end
-      @rbs_builder = RBS::DefinitionBuilder.new env: env.resolve_type_names
     rescue LoadError, StandardError => e
       @rbs_load_error = e
       nil