JS: Added ecma2021, thus extractor now can deal with RegExp v flag

Author: Napalys

javascript/extractor/src/com/semmle/jcorn/Parser.java

@@ -788,6 +788,7 @@ private Token readRegexp() {
       String validFlags = "gim";
       if (this.options.ecmaVersion() >= 6) validFlags = "gimuy";
       if (this.options.ecmaVersion() >= 9) validFlags = "gimsuy";
+      if (this.options.ecmaVersion() >= 12) validFlags = "gimsuyv";
       if (!mods.matches("^[" + validFlags + "]*$"))
         this.raise(start, "Invalid regular expression flag");
       if (mods.indexOf('u') >= 0) {

javascript/extractor/src/com/semmle/js/extractor/ExtractorConfig.java

@@ -41,7 +41,8 @@ public static enum ECMAVersion {
     ECMA2017(2017, 8),
     ECMA2018(2018, 9),
     ECMA2019(2019, 10),
-    ECMA2020(2020, 11);
+    ECMA2020(2020, 11),
+    ECMA2021(2021, 12);
 
     private final int version;
     public final int legacyVersion;
@@ -232,7 +233,7 @@ public Set<String> getPredefinedGlobals() {
   private VirtualSourceRoot virtualSourceRoot;
 
   public ExtractorConfig(boolean experimental) {
-    this.ecmaVersion = experimental ? ECMAVersion.ECMA2020 : ECMAVersion.ECMA2019;
+    this.ecmaVersion = experimental ? ECMAVersion.ECMA2021 : ECMAVersion.ECMA2019;
     this.platform = Platform.AUTO;
     this.jsx = true;
     this.sourceType = SourceType.AUTO;