add backup extension ability d.ts

Signed-off-by: huaqingsimeng <qiukaiqing@huawei.com>

api/@ohos.application.BackupExtensionAbility.d.ts

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2023 Huawei Device Co., Ltd.
+ * 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.
+ */
+
+/**
+ * Describe bundle version
+ *
+ * @interface BundleVersion
+ * @syscap SystemCapability.FileManagement.StorageService.Backup
+ * @StageModelOnly
+ * @since 10
+ */
+export interface BundleVersion {
+  /**
+   * Indicates bundle`s version code.
+   *
+   * @type {number}
+   * @syscap SystemCapability.FileManagement.StorageService.Backup
+   * @StageModelOnly
+   * @since 10
+   */
+  code: number;
+
+  /**
+   * Indicates bundle`s version name.
+   *
+   * @type {string}
+   * @syscap SystemCapability.FileManagement.StorageService.Backup
+   * @StageModelOnly
+   * @since 10
+   */
+  name: string;
+}
+
+/**
+ * Class to be override for backup extension ability.
+ *
+ * @syscap SystemCapability.FileManagement.StorageService.Backup
+ * @StageModelOnly
+ * @since 10
+ */
+export default class BackupExtensionAbility {
+  /**
+   * Callback to be called when the backup procedure is started.
+   * Developer could override this method to build files to be backup.
+   *
+   * @syscap SystemCapability.FileManagement.StorageService.Backup
+   * @StageModelOnly
+   * @since 10
+   */
+  onBackup(): void;
+
+  /**
+   * Callback to be called when the restore procedure is started.
+   * Developer could override this method to restore from copies for various bundle versions.
+   *
+   * @param { BundleVersion } bundleVersion Bundle version to be restore.
+   * @syscap SystemCapability.FileManagement.StorageService.Backup
+   * @StageModelOnly
+   * @since 10
+   */
+  onRestore(bundleVersion: BundleVersion): void;
+}