diff --git a/src/typing/tvar.mli b/src/typing/tvar.mli
new file mode 100644
index 00000000000..763ab3f5c90
--- /dev/null
+++ b/src/typing/tvar.mli
@@ -0,0 +1,24 @@
+(*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
+
+open Reason
+
+val mk_no_wrap : Context.t -> reason -> int
+
+val mk : Context.t -> reason -> Type.t
+
+val mk_where : Context.t -> reason -> (Type.t -> unit) -> Type.t
+
+val mk_where_no_wrap : Context.t -> reason -> (Type.t -> unit) -> int
+
+val mk_no_wrap_where : Context.t -> reason -> (reason * int -> unit) -> Type.t
+
+val mk_fully_resolved_lazy : Context.t -> reason -> Type.t lazy_t -> Type.t
+
+val mk_fully_resolved : Context.t -> reason -> Type.t -> Type.t
+
+val mk_resolved : Context.t -> reason -> Type.t -> Type.t