import type { DB } from '../db/index.js';
/**
 * What the tracker table says has been applied, in whichever vocabulary the
 * table currently speaks:
 *
 * - `tags`: the upgraded shape — applied = the exact set of recorded migration
 *   tags (see `applyMigrations`, which owns the membership semantics and the
 *   legacy-table upgrade).
 * - `legacy-threshold`: a not-yet-upgraded table (no `tag` column) can only
 *   express the old high-water mark, `max(created_at)`. It is read for exactly
 *   one purpose: scoping the pre-apply SAFETY check to pending migrations, so
 *   a fully-current database with a destructive op in its applied history can
 *   still run a clean no-op `migrate`. `applyMigrations` upgrades the table on
 *   its next run, after which this variant never appears again.
 *
 * `null` — the table does not exist; nothing has been applied.
 */
export type AppliedState = {
    kind: 'tags';
    tags: ReadonlySet<string>;
} | {
    kind: 'legacy-threshold';
    threshold: number;
};
export declare function readAppliedState(db: DB, migrationsTable: string): Promise<AppliedState | null>;
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