/**
 * @copyright Sister Software
 * @license AGPL-3.0
 * @author Teffen Ellis, et al.
 * @file Convert an overlay parquet to the current row schema, without its recipe output.
 *   `mailwoman-derived-tuples` wherever the upstream was not recorded.
 */
import type { PathBuilderLike } from "path-ts";
/**
 * The register each overlay source's rows came from, or `mailwoman-derived-tuples`
 * when the upstream was not recorded.
 */
export declare const OVERLAY_REGISTERS: Record<string, string | null>;
/**
 * What a parquet migration observed.
 */
export interface OverlayMigrationSummary {
    rows: number;
    bySource: Record<string, number>;
}
/**
 * The register for one overlay source, refusing a source this map does not name.
 */
export declare function registerForSource(source: string): string | null;
/**
 * Rewrite one overlay parquet onto the current row schema, staged through
 * {@linkcode jsonlToParquet} so it has the same column list as every other overlay.
 */
export declare function migrateOverlayParquet(input: PathBuilderLike, output: PathBuilderLike): Promise<OverlayMigrationSummary>;
//# sourceMappingURL=overlay-parquet.d.ts.map