/**
 * Row-anchor assignment for the Google Sheets API sync provider.
 *
 * Ensures every nonblank row of one registered tab carries an anchor in the
 * tab's LAST system column (a `sync-anchor:<uuid>` cell value), writing all
 * planned anchors in ONE atomic batchUpdate. Rows with more than one anchor
 * fail closed; duplicate anchors across rows are reported as evidence. A
 * user_input tab without the system column fails closed (legacy format); a
 * user-edited system cell is simply reassigned a fresh anchor. No re-read is
 * performed.
 */
import type { EnsureSyncRowAnchorsRequest, EnsureSyncRowAnchorsResult } from "../../../../contracts/sheets/syncSheets.js";
import { type AnchorPlanResult, type ObservedTab } from "../model/observation.js";
import { type GoogleSheetsApiProviderDeps } from "./shared.js";
/**
 * Ensures every nonblank row of one registered tab carries a system-column
 * anchor, writing all planned anchors in ONE atomic batchUpdate. Rows with
 * more than one anchor fail closed; duplicate anchors across rows are
 * reported as evidence. No re-read is performed.
 */
export declare function ensureRowAnchors(deps: GoogleSheetsApiProviderDeps, request: EnsureSyncRowAnchorsRequest): Promise<EnsureSyncRowAnchorsResult>;
/** Writes every planned anchor of one tab in one atomic batch. */
export declare function writeAnchors(deps: GoogleSheetsApiProviderDeps, tab: ObservedTab, plan: AnchorPlanResult, anchorColumn: number | undefined): Promise<void>;
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