diff --git a/src_v2/parser/builder_types.nim b/src_v2/parser/builder_types.nim
new file mode 100644
index 0000000..208e72b
--- /dev/null
+++ b/src_v2/parser/builder_types.nim
@@ -0,0 +1,16 @@
+import fp/[
+  resultM,
+]
+import ./parser_types
+
+type
+  Builder*[T] = tuple[
+    parser: Parser,
+    tree: seq[T]
+  ]
+  builderErrorKind* = enum
+    parserError
+  BuilderError*[T] = ref object
+    kind*: builderErrorKind
+    builder*: Builder[T]
+  BuilderResult*[T] = Result[Builder[T], BuilderError[T]]