import type { SqlClient } from "../../types.js";
import { FsStateBase } from "./state.js";
export declare class FsVersionBase extends FsStateBase {
    protected getVersionRootId(tx: SqlClient): Promise<number>;
    protected createVersionRootRecord(tx: SqlClient, internalPath: string): Promise<number>;
    protected assertCanCreateVersionRoot(tx: SqlClient, internalPath: string): Promise<void>;
    protected ensureVersionRootInitialized(tx: SqlClient, internalPath: string): Promise<void>;
    protected getCurrentVersionId(tx: SqlClient): Promise<number>;
    /**
     * The id of this instance's labeled version, or null when the label has no
     * live version; caches the version root id on the way. A fresh instance
     * resolves both with one join instead of a root lookup and then a label
     * lookup. A missing root takes `getVersionRootId`'s path, which may create
     * the `/` root record or throw ENOTVERSIONED.
     */
    private lookupLabeledVersionId;
    protected ensureVersion(tx: SqlClient): Promise<number>;
    /** Resolve a label to a version ID in this workspace, or null if missing. */
    protected getVersionIdByLabel(tx: SqlClient, label: string): Promise<number | null>;
    protected requireVersionIdByLabel(tx: SqlClient, label: string): Promise<number>;
    /**
     * Acquire transaction-scoped advisory locks for the given version IDs in
     * deterministic order (sorted ascending) to avoid deadlocks. Released at end
     * of transaction.
     */
    protected lockVersions(tx: SqlClient, versionIds: number[]): Promise<void>;
    /**
     * Find the lowest common ancestor (in the version graph) of `idA` and `idB`,
     * or `null` if they have no common ancestor. "Lowest" = smallest sum of
     * depths across the two ancestor chains, which is the version closest to
     * both endpoints. Used by `merge()` for three-way classification.
     */
    protected findLCA(tx: SqlClient, idA: number, idB: number): Promise<number | null>;
    /**
     * Count of visible (non-tombstone) entries across the entire workspace at
     * `versionId`. Used by batch operations to validate `maxFiles` once before
     * committing many writes, instead of re-checking after every write.
     */
    protected globalVisibleCount(tx: SqlClient, versionId: number): Promise<number>;
}
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