Improve performance

babel · May 26, 2021 · aa39663 · aa39663
1 parent 4ee6a27
commit aa39663
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/packages/babel-plugin-transform-block-scoping/src/index.js b/packages/babel-plugin-transform-block-scoping/src/index.js
@@ -773,7 +773,13 @@ class BlockScoping {
         if (isBlockScoped(node)) {
           convertBlockScopedToVar(path, node, block, this.scope);
         }
-        declarators = declarators.concat(node.declarations || node);
+        if (node.declarations) {
+          for (let i = 0; i < node.declarations.length; i++) {
+            declarators.push(node.declarations[i]);
+          }
+        } else {
+          declarators.push(node);
+        }
       }
       if (t.isLabeledStatement(node)) {
         addDeclarationsFromChild(path.get("body"), node.body);