/**
 * Thrown by `markAsApplied` when the version already has a tracking record
 * in a non-applied state (e.g. `failed`, `rolled_back`) and therefore
 * cannot be silently treated as an idempotent re-apply. Surfaces the
 * existing state so the caller can decide whether to retry, recover, or
 * roll back.
 */
export declare class MigrationAlreadyAppliedError extends Error {
    readonly version: string;
    readonly currentStatus: string | undefined;
    constructor(version: string, currentStatus: string | undefined);
}
/**
 * Thrown when a tracker write is cancelled because the migration lock was
 * taken by another process between `acquireLock()` and the write itself
 * (e.g. the original lock TTL expired and a second worker took over).
 *
 * The transaction was rolled back atomically — no partial state was
 * written. The safe action is to stop the current `up()` / `down()` run.
 */
export declare class MigrationLockLostError extends Error {
    readonly version: string;
    constructor(version: string);
}
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