/**
 * CRDT state types, merge logic, and build helpers.
 * per-collection CRDT mode: 'lww-map' | 'rga' | 'yjs'
 *
 * The encrypted envelope wraps the CRDT state (not the resolved snapshot).
 * Adapters only ever see ciphertext. `collection.get(id)` returns the
 * resolved snapshot; `collection.getRaw(id)` returns the full CRDT state.
 */
import type { CrdtState, LwwMapState, RgaState } from '../../kernel/types.js';
export type { CrdtMode, CrdtState, LwwMapState, RgaState, YjsState } from '../../kernel/types.js';
/**
 * Resolve a CRDT state into the end-user record snapshot.
 *
 * - `lww-map` → `Record<string, unknown>` (field values extracted from registers)
 * - `rga`     → `unknown[]` (non-tombstoned items in insertion order)
 * - `yjs`     → `string` (base64 update blob; use @noy-db/yjs for a Y.Doc)
 */
export declare function resolveCrdtSnapshot(state: CrdtState): unknown;
/**
 * Merge two CRDT states produced by concurrent writes.
 * Called by the collection-level conflict resolver registered with SyncEngine.
 *
 * For `yjs`: core cannot merge Yjs without importing the `yjs` package.
 * The caller must handle that case by falling back to the higher-`_v` envelope.
 */
export declare function mergeCrdtStates(a: CrdtState, b: CrdtState): CrdtState;
/**
 * Build (or update) an lww-map state from a new record.
 *
 * All fields in the new record win at timestamp `now`.
 * Fields present in the existing state but absent from the new record
 * are preserved (they were written by another device).
 */
export declare function buildLwwMapState(record: Record<string, unknown>, existing: LwwMapState | undefined, now: string): LwwMapState;
/**
 * Build (or update) an RGA state from a new array.
 *
 * Existing items are matched to new elements by deep-equality of their `v`.
 * Unmatched existing items are tombstoned. New elements that have no existing
 * match get a fresh NID via `generateNid()`.
 */
export declare function buildRgaState(arr: unknown[], existing: RgaState | undefined, generateNid: () => string): RgaState;