import type { LanguageModelV4StreamPart, LanguageModelV4StreamResult } from "@ai-sdk/provider";
import { FallbackPumpParts } from "./stream-pump-parts.js";
import { type CapturedReader } from "./stream-reader.js";
import type { FailureClassification } from "./types.js";
export declare class FallbackPump extends FallbackPumpParts {
    protected forwardPart(value: LanguageModelV4StreamPart, idx: number, advanced: boolean): boolean;
    protected cleanupReader(reader: CapturedReader): void;
    protected handleReadError(readErr: unknown, idx: number): Promise<void>;
    protected handleErrorPart(value: Extract<LanguageModelV4StreamPart, {
        type: "error";
    }>, idx: number): Promise<void>;
    protected pump(result: LanguageModelV4StreamResult, idx: number): Promise<void>;
    protected pumpReader(reader: CapturedReader, idx: number): Promise<void>;
    protected snapshotCanContinue(value: LanguageModelV4StreamPart | undefined): value is LanguageModelV4StreamPart;
    protected waitForDemand(): Promise<void>;
    protected observeFailureForBudget(failure: FailureClassification): void;
    protected finishRequest(success: boolean): void;
    protected cleanupAbortForwarding(): void;
    protected handleReadRejection(error: unknown, reader: CapturedReader, index: number): Promise<void>;
    protected readNext(reader: CapturedReader, firstContentDeadline: number | undefined): Promise<ReadableStreamReadResult<LanguageModelV4StreamPart>>;
}