diff --git a/Lite/LanguageServer/Spec2Types.pm b/Lite/LanguageServer/Spec2Types.pm
new file mode 100755
index 00000000..6e7a95f0
--- /dev/null
+++ b/Lite/LanguageServer/Spec2Types.pm
@@ -0,0 +1,36 @@
+#!/usr/bin/env perl
+package YATT::Lite::LanguageServer::Spec2Types;
+use strict;
+use warnings qw(FATAL all NONFATAL misc);
+use File::AddInc;
+use MOP4Import::Base::CLI_JSON -as_base;
+
+use YATT::Lite::LanguageServer::SpecParser qw/Interface Decl/;
+
+sub interface2typespec {
+  (my MY $self, my Interface $if) = @_;
+  if ($if->{extends}) {
+    ...
+  } else {
+    [$if->{name} => [fields => map {
+      my Decl $slotDecl = $_;
+      if ($slotDecl->{kind}) {
+        Carp::croak "Not implemented for interface body: $slotDecl->{kind}";
+      } elsif ($slotDecl->{deprecated}) {
+        ();
+      } else {
+        my $name = $slotDecl->{body}[0];
+        $name =~ s/\?\z//;
+        if ($slotDecl->{comment}) {
+          [$name => doc => $slotDecl->{comment}];
+        } else {
+          $name
+        }
+      }
+    } @{$if->{body}}]]
+  }
+}
+
+MY->run(\@ARGV) unless caller;
+
+1;