rxdb/src/replication-protocol/default-conflict-handler.ts

A local-first realtime NoSQL Database for JavaScript applications - https://rxdb.info/

import {
    deepEqual
} from '../plugins/utils/index.ts';
import { stripAttachmentsDataFromDocument } from '../rx-storage-helper.ts';
import type { RxConflictHandler } from '../types';

export const defaultConflictHandler: RxConflictHandler<any> = {
    isEqual(a, b) {
        /**
         * If the documents are deep equal,
         * we have no conflict.
         * On your custom conflict handler you might only
         * check some properties, like the updatedAt time,
         * for better performance, because deepEqual is expensive.
         */
        return deepEqual(
            stripAttachmentsDataFromDocument(a),
            stripAttachmentsDataFromDocument(b)
        );
    },
    resolve(i) {
        /**
         * The default conflict handler will always
         * drop the fork state and use the master state instead.
         */
        return i.realMasterState;
    }
};