import type { LanguageModelV4StreamPart } from "@ai-sdk/provider";
import { FallbackPumpFailure } from "./stream-pump-failure.js";
export declare abstract class FallbackPumpParts extends FallbackPumpFailure {
    protected isEmptyFinish(value: LanguageModelV4StreamPart, candidateHasOutput: boolean): boolean;
    protected preludeWouldOverflow(value: LanguageModelV4StreamPart): boolean;
    protected bufferedMetadataNodes(value: LanguageModelV4StreamPart): number;
    protected bufferedTextLength(value: LanguageModelV4StreamPart): number;
    protected isOutputPart(value: LanguageModelV4StreamPart): boolean;
    protected shouldBufferPart(value: LanguageModelV4StreamPart): boolean;
    protected partType(value: LanguageModelV4StreamPart): string;
    protected validatePart(value: LanguageModelV4StreamPart): unknown | undefined;
    protected snapshotAndValidatePart(value: LanguageModelV4StreamPart, index: number): Promise<LanguageModelV4StreamPart | undefined>;
}