retrofit try-catch-finally as block-scoped (#4178)

- support optional catch binding
2020-10-04 22:30:14 +01:00
parent f9946767c9
commit 8f0521d51d
8 changed files with 74 additions and 19 deletions
--- a/lib/transform.js
+++ b/lib/transform.js
@@ -116,7 +116,7 @@ TreeTransformer.prototype = new TreeWalker;
        if (self.bfinally) self.bfinally = self.bfinally.transform(tw);
    });
    DEF(AST_Catch, function(self, tw) {
-        self.argname = self.argname.transform(tw);
+        if (self.argname) self.argname = self.argname.transform(tw);
        self.body = do_list(self.body, tw);
    });
    DEF(AST_Definitions, function(self, tw) {