Migrate old externs 5/x

resolver-go/internal/resolver/resolver.go

@@ -252,8 +252,21 @@ func (r *Resolver) MergeJS(files []classmap.Resource) ([]byte, string, error) {
 		}
 		b.Write(src)
 	}
-	wrapped := append([]byte("(function(){"), b.Bytes()...)
-	wrapped = append(wrapped, []byte("})();")...)
+	prefix := []byte(`
+/** @define {boolean} */
+var DEFINE_DEBUG = false;
+
+(function(){
+`)
+	suffix := []byte(`
+})();
+`)
+
+	wrapped := make([]byte, 0, len(prefix)+b.Len()+len(suffix))
+	wrapped = append(wrapped, prefix...)
+	wrapped = append(wrapped, b.Bytes()...)
+	wrapped = append(wrapped, suffix...)
+
 	return wrapped, hashList(files, "js"), nil
 }