convert @babel/helper-module-transforms to typescript (#12928)

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

lib/babel-packages.js.flow

@@ -208,3 +208,7 @@ declare module "@babel/highlight" {
 declare module "@babel/plugin-bugfix-v8-spread-parameters-in-optional-chaining" {
   declare module.exports: any;
 }
+
+declare module "@babel/helper-module-transforms" {
+  declare module.exports: any;
+}