import * as pb from "../proto/orchestrator_service_pb";
import { OrchestrationContext } from "./context/orchestration-context";
import { RetryTaskBase, RetryTaskType } from "./retry-task-base";
import { AsyncRetryHandler, RetryHandlerResult } from "./retry/retry-handler";
/**
 * A task that uses an AsyncRetryHandler for imperative retry control.
 *
 * @remarks
 * Unlike RetryableTask which uses a declarative RetryPolicy, this task delegates
 * all retry decisions to a user-provided handler function. The handler receives
 * a RetryContext with failure details, attempt count, and elapsed time, and
 * returns true to retry or false to stop.
 *
 * This mirrors the .NET SDK's InvokeWithCustomRetryHandler pattern, where the
 * retry handler runs as orchestrator code (subject to replay).
 */
export declare class RetryHandlerTask<T> extends RetryTaskBase<T> {
    private readonly _handler;
    private readonly _orchestrationContext;
    /**
     * Creates a new RetryHandlerTask instance.
     *
     * @param handler - The async retry handler for imperative retry decisions
     * @param orchestrationContext - The orchestration context for the current execution
     * @param action - The orchestrator action associated with this task
     * @param startTime - The time when the task was first scheduled
     * @param taskType - The type of task (activity or sub-orchestration)
     */
    constructor(handler: AsyncRetryHandler, orchestrationContext: OrchestrationContext, action: pb.OrchestratorAction, startTime: Date, taskType: RetryTaskType);
    /**
     * Gets the async retry handler for this task.
     */
    get handler(): AsyncRetryHandler;
    /**
     * Invokes the async retry handler to determine whether to retry.
     *
     * @param currentTime - The current orchestration time (for deterministic replay)
     * @returns A Promise that resolves to `true` to retry immediately,
     *   `false` to stop retrying, or a positive number indicating the
     *   delay in milliseconds before the next retry attempt
     */
    shouldRetry(currentTime: Date): Promise<RetryHandlerResult>;
}