/**
 * @license
 * Copyright 2026 Steven Roussey <sroussey@gmail.com>
 * SPDX-License-Identifier: Apache-2.0
 */
import type { AnyTabularStorage } from "../tabular/ITabularStorage";
/**
 * Backend-agnostic, page-based backfill loop. Iterates every row in the
 * storage in `batchSize`-row pages using cursor pagination so iteration
 * is stable under concurrent writes.
 *
 * For each row, calls `transform` and:
 *   - if it returns the **same reference** as the input, skips the write
 *     (the row is unchanged);
 *   - if it returns `undefined`, deletes the row;
 *   - otherwise, writes the new row via `put`.
 */
export declare function runBackfill(storage: AnyTabularStorage, batchSize: number, transform: (row: Record<string, unknown>) => Promise<Record<string, unknown> | undefined> | Record<string, unknown> | undefined): Promise<void>;
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