Don't add flag y if allowUnhandledGAnchors and has alts with and with…

…out leading \G
slevithan · Dec 19, 2024 · a3f62d3 · a3f62d3
1 parent 3ee05b2
commit a3f62d3
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/src/transform.js b/src/transform.js
@@ -323,11 +323,14 @@ const FirstPassVisitor = {
         hasAltWithoutLeadG = true;
       }
     }
-    if (hasAltWithLeadG && hasAltWithoutLeadG && !allowUnhandledGAnchors) {
-      throw new Error(r`Uses "\G" in a way that's unsupported`);
+    if (hasAltWithLeadG) {
+      if (!hasAltWithoutLeadG) {
+        // Supported `\G` nodes will be removed (and add flag y) when traversed; others will error
+        leadingGs.forEach(g => supportedGNodes.add(g));
+      } else if (!allowUnhandledGAnchors) {
+        throw new Error(r`Uses "\G" in a way that's unsupported`);
+      }
     }
-    // Supported `\G` nodes will be removed when traversed; others will error
-    leadingGs.forEach(g => supportedGNodes.add(g))
   },
 
   Quantifier({node}) {