Updated required Javascript features for chat.

build.js

@@ -54,7 +54,7 @@ if(!isDebugBuild)
     }));
 
 const swcJscOptions = {
-    target: 'es2021',
+    target: 'es2020',
     loose: false,
     externalHelpers: false,
     keepClassNames: true,

src/mami-init.js/main.js

@@ -31,13 +31,8 @@
         }
 
         try {
-            eval('const c = 1; let l = 2;');
-        } catch(e) {
-            return false;
-        }
-
-        try {
-            eval('for(const i of ["a", "b"]);');
+            // this is eval'd to allow a parse exception to be thrown without cancelling the entire script
+            eval('for(const i of ["a", "b"]); let obj; obj?.test(); obj ??= {};');
         } catch(e) {
             return false;
         }