Javascript fix missing export (#4076)

* fix missing APIs

* more missing APIs

Signed-off-by: Eric Vergnaud <eric.vergnaud@wanadoo.fr>

* bump beta number

* add missing export

* bump package version

Signed-off-by: Eric Vergnaud <eric.vergnaud@wanadoo.fr>

runtime/JavaScript/package.json

@@ -1,6 +1,6 @@
 {
   "name": "antlr4",
-  "version": "4.12.0-beta.3",
+  "version": "4.12.0-beta.4",
   "type": "module",
   "description": "JavaScript runtime for ANTLR4",
   "main": "dist/antlr4.js",

runtime/JavaScript/src/antlr4/index.js

@@ -37,6 +37,7 @@ import BailErrorStrategy from "./error/BailErrorStrategy.js";
 import Interval from './misc/Interval.js';
 import IntervalSet from './misc/IntervalSet.js';
 import ParseTreeListener from "./tree/ParseTreeListener.js";
+import ParseTreeVisitor from "./tree/ParseTreeVisitor.js";
 import ParseTreeWalker from "./tree/ParseTreeWalker.js";
 import ErrorListener from "./error/ErrorListener.js"
 import DiagnosticErrorListener from "./error/DiagnosticErrorListener.js"
@@ -52,7 +53,7 @@ export default {
 export {
     Token, CommonToken, CharStreams, CharStream, InputStream, FileStream, CommonTokenStream, Lexer, Parser,
     RuleNode, TerminalNode, ParseTreeWalker, RuleContext, ParserRuleContext, Interval, IntervalSet,
-    PredictionMode, LL1Analyzer, ParseTreeListener, ATN, ATNDeserializer, PredictionContextCache, LexerATNSimulator, ParserATNSimulator, DFA,
+    PredictionMode, LL1Analyzer, ParseTreeListener, ParseTreeVisitor, ATN, ATNDeserializer, PredictionContextCache, LexerATNSimulator, ParserATNSimulator, DFA,
     RecognitionException, NoViableAltException, FailedPredicateException, ErrorListener, DiagnosticErrorListener, BailErrorStrategy,
     arrayToString
 }
@@ -61,4 +62,4 @@ export {
 // need to import unused to force loading
 import StringHashCode from './utils/stringHashCode.js';
 import CodePointAt from './polyfills/codepointat.js';
-import FromCodePoint from './polyfills/fromcodepoint.js';
+import FromCodePoint from './polyfills/fromcodepoint.js';