import { FallbackPumpObservability } from "./stream-pump-observability.js";
import type { FailureClassification } from "./types.js";
export declare abstract class FallbackPumpFailure extends FallbackPumpObservability {
    protected abstract observeFailureForBudget(failure: FailureClassification): void;
    protected onFailure(error: unknown, idx: number): Promise<void>;
    protected emitMaxAttemptSkipsWhenNeeded(retry: boolean, nextIndex: number, withinAttemptBudget: boolean): void;
    protected terminateForCallerAbort(): boolean;
    protected captureCallerAbortReason(signal: AbortSignal | undefined): unknown;
    protected rollbackDiscardedCandidateBudget(): void;
    protected handleFallbackOpenFailure(error: unknown, index: number): Promise<void> | undefined;
    protected terminalFailure(error: unknown, classification: FailureClassification): unknown;
}