import type { ClickHouseSchemaAst } from '../schema/types.js';
import type { Snapshot } from './types.js';
type SnapshotWithoutHash = Omit<Snapshot, 'contentHash'>;
/**
 * Converts a schema AST into a deterministic ClickHouse snapshot.
 *
 * Snapshot serialization normalizes ordering, SQL-expression whitespace, type
 * wrappers, settings, and materialized-view dependencies before computing the
 * content hash used by migration metadata.
 */
export declare function serializeSchemaToSnapshot(schema: ClickHouseSchemaAst): Snapshot;
/**
 * Serializes a snapshot with stable formatting for writing to disk and hashing.
 */
export declare function snapshotToStableJson(snapshot: Snapshot | SnapshotWithoutHash): string;
/**
 * Computes the SHA-256 content hash for a normalized snapshot.
 */
export declare function hashSnapshot(snapshot: Snapshot | SnapshotWithoutHash): string;
export {};
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