import type { SchemaSnapshot } from "../types.js";
/**
 * On-disk format version for the committed schema snapshot. Bump when the
 * SchemaSnapshot descriptor gains a field (a DDL-coverage feature); add the
 * matching upgrade branch in parseSnapshot at the same time.
 *
 * v3 — ViewDescriptor gained `fingerprint`, `columns` and `dependents`. The
 * fingerprint is how Postgres decides whether a view is up to date (Postgres deparses
 * view SQL, so the emitted text can never be compared against what it stores). A
 * toolchain that does not understand these fields would silently fall back to the old
 * text comparison and re-propose every view on every migrate — so a v3 snapshot must
 * hard-fail on an older reader rather than be quietly misread. Reading an OLDER (v2)
 * snapshot stays fine: the missing fields read as `undefined`, which every consumer
 * treats as "unknown" and fails safe on.
 *
 * NOTE for anyone touching canonicalize(): a view's `columns` array is ORDER-SENSITIVE.
 * Postgres allows a non-destructive CREATE OR REPLACE only when the old column list is
 * a PREFIX of the new one, so sorting that array would destroy the very information the
 * decision rests on.
 */
export declare const SNAPSHOT_FORMAT_VERSION = 3;
export declare function serializeSnapshot(snapshot: SchemaSnapshot): string;
export declare function parseSnapshot(text: string): SchemaSnapshot;
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