import { CID } from 'multiformats/cid';
import * as t from './types';
export declare const assureValidNextOp: (did: string, ops: t.IndexedOperation[], proposed: t.CompatibleOpOrTombstone) => Promise<{
    nullified: CID[];
    prev: CID | null;
}>;
export declare const validateOperationLog: (did: string, ops: t.CompatibleOpOrTombstone[]) => Promise<t.DocumentData | null>;
export declare const opToData: (did: string, op: t.CompatibleOpOrTombstone) => t.DocumentData | null;
export declare const getLastOpWithCid: (ops: t.CompatibleOpOrTombstone[]) => Promise<{
    op: t.CompatibleOpOrTombstone;
    cid: CID;
}>;