From Canvas of old to Web of today. Maybe it saves someone a few hours of its life when porting from pre-0.12.3.
@@ -11,7 +11,8 @@
"map": {
"*": {
"00comment": "These are backward compatibility pointers.",
- "amber_core/Web": "amber-contrib-web/Web"
+ "amber_core/Web": "amber-contrib-web/Web",
+ "amber_core/Canvas": "amber-contrib-web/Web"
}