/**
 * Copyright 2023 Google LLC
 *
 * 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
 *
 *    https://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.
 */
export interface BackfillTask<P> {
    tasksDoc: string;
    taskId: string;
    collectionName: string;
    chunk: P[];
}
export declare function taskThreadTaskHandler<P>(handler: (chunk: P[]) => Promise<{
    success: number;
    failed: number;
    skipped: number;
}>, queueName: string, extensionInstanceId?: string): (data: BackfillTask<P>) => Promise<void>;
export declare function getNextTaskId(prevId: string, extensionInstanceId?: string): string;