graph-crdt/dist/union/index.js

A Delta State Graph CRDT variant

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _stringify = require("babel-runtime/core-js/json/stringify");

var _stringify2 = _interopRequireDefault(_stringify);

exports.conflict = conflict;

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Utilities for deterministically merging node attributes.
 *
 * @private
 * @module graph-crdt/src/union
 */

/**
 * Deterministically resolves merge conflicts
 * on JSON-compatible data.
 *
 * @param  {Object} field1 - Current state field metadata.
 * @param  {Object} field2 - Update field metadata.
 * @returns {Object} - The greater value, or if they're
 * equal, the current state.
 */
function conflict(field1, field2) {

  /** Turn the values into comparable strings. */
  var string = {
    current: (0, _stringify2.default)(field1.value),
    update: (0, _stringify2.default)(field2.value)
  };

  /** Are the values equal? */
  var equal = string.current === string.update;

  /** Is our current value greater? */
  var greater = string.current > string.update;

  /** Return the winning value. */
  return equal || greater ? field1 : field2;
}