redux-undoable

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

github.com/linn/redux-undoable

linn/redux-undoable

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<!doctype html> <html lang="en"> <head> <title>Code coverage report for undoable.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="prettify.css" /> <link rel="stylesheet" href="base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="index.html">All files</a> undoable.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 100% Statements 20/20 </div> <div class='fl pad1y space-right2'> 85.71% Branches 6/7 </div> <div class='fl pad1y space-right2'> 100% Functions 7/7 </div> <div class='fl pad1y space-right2'> 100% Lines 18/18 </div> </div> </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103</td><td class="line-coverage quiet">1x 1x 1x   1x           1x                   1x 3x 3x 3x                   1x 3x 3x 3x                   1x           17x             17x   68x                                   6x                                              </td><td class="text"><pre class="prettyprint lang-js">export const UNDO = 'UNDO'; export const REDO = 'REDO'; export const REPLAY_FINISHED = '@@redux-undoable/REPLAY_FINISHED';   const replayFinished = () => { return { type: REPLAY_FINISHED }; };   const replay = function(initial, actions, reducer) { return actions .map(action => { // create a copy of the action with metadata to indicate that a replay is in progress return { ...action, meta: { replay: true } }; }) .concat(replayFinished()) .reduce((state, action) => reducer(state, action), initial); };   const undo = function(initial, past, present, future, reducer) { const action = past[past.length - 1]; const newPast = past.slice(0, past.length - 1); const previous = replay(initial, newPast, reducer);   return { initial, past: newPast, present: previous, future: [ action, ...future ] }; };   const redo = function(initial, past, present, future, reducer){ const action = future[0]; const newFuture = future.slice(1); const newPresent = reducer(present, action);   return { initial, past: [ ...past, action ], present: newPresent, future: newFuture }; };   const defaultConfig = { init: ['@@redux/INIT'], include: [] };   export default function(reducer, config) { const initialState = { initial: null, past: [], present: reducer(undefined, {}), future: [] };   const mergedConfig = Object.assign(defaultConfig, config);   return function (state = initialState, action) { const { initial, past, present, future } = state;   if (mergedConfig.init.includes(action.type) && !state.present) { return { initial, past, present: replay(initial, past, reducer), future }; }   switch (action.type) { case UNDO: return undo(initial, past, present, future, reducer); case REDO: return redo(initial, past, present, future, reducer); default: const newPresent = reducer(present, action); if (present === newPresent) { return state; }   if (!mergedConfig.include.includes(action.type)) { return { initial, past, present: newPresent, future }; }   return { initial, past: [ ...past, action ], present: newPresent, future: [] }; } }; }  </pre></td></tr> </table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="http://istanbul-js.org/" target="_blank">istanbul</a> at Mon Aug 22 2016 13:37:48 GMT+0100 (BST) </div> </div> <script src="prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="sorter.js"></script> </body> </html>