import { Operation } from 'fast-json-patch';
import { DiffOutput, ActionType } from '../types';
/**
 * Formats the action to have one of `add`, `remove` or `edit` values
 * @param {String} action The action performed by the diff library
 * @returns {String} The formatted action output
 *
 * @private
 */
export declare function formatAction(action: string): ActionType;
/**
 * Get the `before` value from the first document
 * @param firstDocument The first document which we will get the before value from
 * @param {String} path The path from where we can get the value
 * @returns The value from the first document
 *
 * @private
 */
export declare function getBeforeValue(firstDocument: any, path: string): any;
/**
 * Get the `after` value
 * @param diffObject A single diff object
 * @returns The value that is present inside the second document
 *
 * @private
 */
export declare function getAfterValue(diffObject: Operation): any;
/**
 * Sets the index property in case of an array change
 * @param changeObject The change object
 * @param {String} path The original path
 *
 * @private
 */
export declare function setIndex(changeObject: DiffOutput, firstDocument: any, path: string): void;
/**
 * Formats the original diff output
 * @param {Operation[]} diff The original diff array
 * @param {*} firstDocument The first document
 * @returns {DiffOutput[]} The modified diffs array
 *
 * @private
 */
export declare function formatDiffOutput(diffInput: Operation[], firstDocument: any): DiffOutput[];
export declare function getDocumentMajorVersion(document: any): string;
export declare function incompatibleDocuments(firstDocument: any, secondDocument: any): boolean;