/**
 * Fetch pipeline stages as simple functions.
 * Each stage is responsible for one phase of the fetch lifecycle.
 *
 * Stages are composed in LaunchpadContent._executeFetchPipeline.
 */
import { ResultAsync } from "neverthrow";
import { ContentError } from "../content-transform.js";
import type { FetchStageContext } from "./fetch-context.js";
export type { FetchStageContext } from "./fetch-context.js";
/**
 * Error thrown during fetching of a specific source.
 */
export declare class ContentFetchError extends ContentError {
    sourceId: string;
    constructor(message: string, sourceId: string, cause?: Error);
}
/**
 * Error thrown during recovery process.
 */
export declare class ContentRecoveryError extends ContentError {
    originalError: ContentError;
    constructor(message: string, originalError: ContentError, cause?: Error);
}
/**
 * Stage 2: Back up existing downloads (optional).
 */
export declare function backupStage(context: FetchStageContext): ResultAsync<void, ContentError>;
/**
 * Stage 3: Clear old downloads.
 */
export declare function clearOldDataStage(context: FetchStageContext): ResultAsync<void, ContentError>;
/**
 * Stage 4: Fetch all sources in parallel.
 */
export declare function fetchSourcesStage(context: FetchStageContext): ResultAsync<void, ContentError>;
/**
 * Stage 5: Run content transforms sequentially.
 * Each transform's temp path is namespaced to the transform name.
 */
export declare function runTransformsStage(context: FetchStageContext): ResultAsync<void, ContentError>;
/**
 * Stage 6: Finalize (success path).
 */
export declare function finalizingStage(context: FetchStageContext): ResultAsync<void, ContentError>;
/**
 * Stage 7: Handle errors and optionally restore from backup.
 */
export declare const errorRecoveryStage: (context: FetchStageContext, error: ContentError) => ResultAsync<{
    restoredSourceIds: string[];
}, ContentError | ContentRecoveryError>;
/**
 * Stage 7 (Final): Clean up temporary and backup directories.
 */
export declare const cleanupStage: (context: FetchStageContext, cleanup?: {
    temp?: boolean;
    backups?: boolean;
}) => ResultAsync<void, ContentError>;
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