Add missing ESM exports (#2010)

Author: nex3

CHANGELOG.md

@@ -1,5 +1,10 @@
 ## 1.63.4
 
+### JavaScript API
+
+* Properly export the legacy API values `TRUE`, `FALSE`, `NULL`, and `types` from
+  the ECMAScript module API.
+
 ### Embedded Sass
 
 * Fix a race condition where closing standard input while requests are in-flight

tool/grind.dart

@@ -71,6 +71,10 @@ void main(List<String> args) {
     'info',
     'render',
     'renderSync',
+    'TRUE',
+    'FALSE',
+    'NULL',
+    'types',
   };
 
   pkg.githubReleaseNotes.fn = () =>