support int enums in jsValueToZig

src/runtime/js.zig

@@ -938,6 +938,12 @@ pub fn Env(comptime State: type, comptime WebApis: type) type {
                         }
                         unreachable;
                     },
+                    .@"enum" => |e| {
+                        switch (@typeInfo(e.tag_type)) {
+                            .int => return std.meta.intToEnum(T, try jsIntToZig(e.tag_type, js_value, self.context)),
+                            else => @compileError(named_function.full_name ++ " has an unsupported enum parameter type: " ++ @typeName(T)),
+                        }
+                    },
                     else => {},
                 }