// Copyright 2021-2024 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
 * Determine whether the given `arg` is a message.
 * If `desc` is set, determine whether `arg` is this specific message.
 */
export function isMessage(arg, schema) {
    const isMessage = arg !== null &&
        typeof arg == "object" &&
        "$typeName" in arg &&
        typeof arg.$typeName == "string";
    if (!isMessage) {
        return false;
    }
    if (schema === undefined) {
        return true;
    }
    return schema.typeName === arg.$typeName;
}