/**
 * Values-only table reads and observation snapshots for the Google Sheets
 * API sync provider.
 *
 * `readRowsBatch` serves several registered tables through ONE
 * `spreadsheets.get` call (fail-closed on missing tabs, header drift, or
 * malformed payloads). The snapshot operations share one grid read per
 * batch, write missing row anchors in ONE atomic batch, and re-read once so
 * committed anchors appear in every snapshot.
 */
import type { ReadSyncSnapshotRequest, ReadSyncTableRowsRequest, SyncObservedSnapshot, SyncSheetsSnapshot, SyncTableRowsResult } from "../../../../contracts/sheets/syncSheets.js";
import { type SyncSnapshotReadMode } from "../../../../contracts/sheets/constants.js";
import { type ObservedTab } from "../model/observation.js";
import { type GoogleSheetsApiProviderDeps } from "./shared.js";
/** Reads one registered table's literal values with one REST read. */
export declare function readRows(deps: GoogleSheetsApiProviderDeps, request: ReadSyncTableRowsRequest): Promise<SyncTableRowsResult>;
/**
 * Reads several registered tables through ONE `spreadsheets.get` call.
 * Results are returned in request order; a missing tab, header drift, or
 * malformed payload fails closed before any result is produced.
 */
export declare function readRowsBatch(deps: GoogleSheetsApiProviderDeps, requests: readonly ReadSyncTableRowsRequest[]): Promise<readonly SyncTableRowsResult[]>;
/** Reads one full snapshot without any mutation (lock-free). */
export declare function readSnapshot(deps: GoogleSheetsApiProviderDeps, request: ReadSyncSnapshotRequest): Promise<SyncSheetsSnapshot>;
/** Combines anchor assignment and one snapshot read under one request. */
export declare function observeSnapshot(deps: GoogleSheetsApiProviderDeps, request: ReadSyncSnapshotRequest): Promise<SyncObservedSnapshot>;
/**
 * Observes several projections with ONE grid read, ONE anchor write (when
 * any anchor is missing), and ONE re-read (when anchors were written), so
 * the committed anchors are reflected in every snapshot. The coordinator
 * already holds every involved mutation lane before this call.
 */
export declare function observeSnapshots(deps: GoogleSheetsApiProviderDeps, requests: readonly ReadSyncSnapshotRequest[]): Promise<readonly SyncObservedSnapshot[]>;
/** Reads the target grids of one or more observation requests (one call). */
export declare function readObservedTabs(deps: GoogleSheetsApiProviderDeps, requests: readonly {
    readonly sheetName: string;
    readonly registeredRange: string;
    readonly readMode?: SyncSnapshotReadMode;
    readonly rowNumbers?: readonly number[];
}[]): Promise<ReadonlyMap<string, ObservedTab>>;
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