redux-undoable/lib/undoable.js

A reducer enhancer (or higher order reducer) that provides undo/redo functionality for Redux by replaying actions (rather than storing previous state)

'use strict';

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

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

exports.default = function (reducer, config) {
  var initialState = {
    initial: null,
    past: [],
    present: reducer(undefined, {}),
    future: []
  };

  var mergedConfig = _extends({}, defaultConfig, config);

  return function () {
    var state = arguments.length <= 0 || arguments[0] === undefined ? initialState : arguments[0];
    var action = arguments[1];
    var initial = state.initial;
    var past = state.past;
    var present = state.present;
    var future = state.future;


    if (mergedConfig.init.includes(action.type) && !state.present) {
      return {
        initial: initial,
        past: past,
        present: replay(initial, past, reducer),
        future: future
      };
    }

    switch (action.type) {
      case UNDO:
        {
          return undo(initial, past, present, future, reducer);
        }
      case REDO:
        {
          return redo(initial, past, present, future, reducer);
        }
      default:
        {
          var newPresent = reducer(present, action);
          if (present === newPresent) {
            return state;
          }

          if (!mergedConfig.include.includes(action.type)) {
            return {
              initial: initial,
              past: past,
              present: newPresent,
              future: future
            };
          }

          return {
            initial: initial,
            past: [].concat(_toConsumableArray(past), [action]),
            present: newPresent,
            future: []
          };
        }
    }
  };
};

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

var REDUX_INIT = '@@redux/INIT';
var UNDO = exports.UNDO = '@@redux-undoable/UNDO';
var REDO = exports.REDO = '@@redux-undoable/REDO';
var REPLAY_FINISHED = exports.REPLAY_FINISHED = '@@redux-undoable/REPLAY_FINISHED';

var replayFinished = function replayFinished() {
  return {
    type: REPLAY_FINISHED
  };
};

var replay = function replay(initial, actions, reducer) {
  return actions.map(function (action) {
    // create a copy of the action with metadata to indicate that a replay is in progress
    return _extends({}, action, { meta: { replay: true } });
  }).concat(replayFinished()).reduce(function (state, action) {
    return reducer(state, action);
  }, initial);
};

var undo = function undo(initial, past, present, future, reducer) {
  var action = past[past.length - 1];
  var newPast = past.slice(0, past.length - 1);
  var previous = replay(initial, newPast, reducer);

  return {
    initial: initial,
    past: newPast,
    present: previous,
    future: [action].concat(_toConsumableArray(future))
  };
};

var redo = function redo(initial, past, present, future, reducer) {
  var action = future[0];
  var newFuture = future.slice(1);
  var newPresent = reducer(present, action);

  return {
    initial: initial,
    past: [].concat(_toConsumableArray(past), [action]),
    present: newPresent,
    future: newFuture
  };
};

var defaultConfig = {
  init: [REDUX_INIT],
  include: []
};
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