diff --git a/runtime/JavaScript/src/antlr4/misc/index.d.ts b/runtime/JavaScript/src/antlr4/misc/index.d.ts
index c9d606a1a2..3179252dac 100644
--- a/runtime/JavaScript/src/antlr4/misc/index.d.ts
+++ b/runtime/JavaScript/src/antlr4/misc/index.d.ts
@@ -1,3 +1,4 @@
+export * from './BitSet'
 export * from './Interval'
 export * from './IntervalSet';
 
diff --git a/runtime/JavaScript/src/antlr4/misc/index.js b/runtime/JavaScript/src/antlr4/misc/index.js
index 80133cee38..930a4b0f89 100644
--- a/runtime/JavaScript/src/antlr4/misc/index.js
+++ b/runtime/JavaScript/src/antlr4/misc/index.js
@@ -1,4 +1,5 @@
+import BitSet from './BitSet.js';
 import Interval from './Interval.js';
 import IntervalSet from './IntervalSet.js';
 
-export default { Interval, IntervalSet }
+export default { BitSet, Interval, IntervalSet }