Check for fields in externalize, internalize

dave · flimzy · commit ec0e4da6b65e · 2023-06-07T23:08:28.000+02:00
Check for fields before accessing first struct field in externalize and internalize functions. Fixes this bug: https://play.jsgo.io/308c189e795b573511cbc4d4606af6b0a60a065a Note: I don't have node so I can't generated the minified prelude.
diff --git a/compiler/prelude/jsmapping.go b/compiler/prelude/jsmapping.go
@@ -113,6 +113,9 @@ var $externalize = function(v, t, makeWrapper) {
         }
         return searchJsObject(v.$get(), t.elem);
       case $kindStruct:
+        if (t.fields.length == 0) {
+          return noJsObject;
+        }
         var f = t.fields[0];
         return searchJsObject(v[f.prop], f.typ);
       case $kindInterface:
@@ -359,6 +362,9 @@ var $internalize = function(v, t, recv, seen, makeWrapper) {
       case $kindPtr:
         return searchJsObject(t.elem);
       case $kindStruct:
+        if (t.fields.length == 0) {
+          return noJsObject;
+        }
         var f = t.fields[0];
         var o = searchJsObject(f.typ);
         if (o !== noJsObject) {
