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redux-undo-redo\n\nAn undo redo package for redux\n\n[![Build Status](https://travis-ci.org/intactile/redux-undo-redo.svg?branch=master)](https://travis-ci.org/intactile/redux-undo-redo)\n[![Maintainability](https://api.codeclimate.com/v1/badges/720449d047afa55671a9/maintainability)](https://codeclimate.com/github/intactile/redux-undo-redo/maintainability)\n[![Test Coverage](https://api.codeclimate.com/v1/badges/720449d047afa55671a9/test_coverage)](https://codeclimate.com/github/intactile/redux-undo-redo/test_coverage)\n\nThis package is heavily inspired by the [undo/redo package](https://github.com/PowToon/redux-undo-redo) developed by [PowToon](https://github.com/PowToon).\n\nThis package adds an undo redo history to a redux state.\nFor each undoable action, you have to provide its _reverting action_.\nIt supports also grouped actions which lets you undo a set of actions in one step.\n\n## Installation\n\n```bash\nnpm install @intactile/redux-undo-redo\n```\n\nor\n\n```bash\nyarn add @intactile/redux-undo-redo\n```\n\n## Configuration\n\nThis package is configured with a set of reverting actions:\n\n```javascript\nimport counter, {\n  increment,\n  decrement,\n  setValue,\n  INCREMENT,\n  DECREMENT,\n  SET_COUNTER_VALUE\n} from \"./counterReduxModule\";\n\nconst revertingActions = {\n  [INCREMENT]: () =\u003e decrement(),\n  [DECREMENT]: () =\u003e increment(),\n  [SET_COUNTER_VALUE]: {\n    action: (action, { val }) =\u003e setValue(val),\n    createArgs: (state, action) =\u003e ({ val: state.counter })\n  }\n};\n```\n\n### Reverting actions\n\nThis is a map between the `action type` and it's reverting action creator, the action creator gets the original action and should return the reverting action.\nIf the the original action is not enough to create a reverting action you can provide `createArgs` that will result in an `args` argument for the reverting action:\n\n```javascript\n{\n  action: (action, args) =\u003e revertingActionCreator(action.something, args.somethingElse),\n  createArgs: (state, action) =\u003e ({somethingElse: state.something}),\n  groupWithPrevious: (action, previousAction) =\u003e action.type === previousAction.type\n}\n```\n\nthe `createArgs` function runs _before_ the action happens and collects information needed to revert the action.\nyou get this as a second argument for the reverting action creator.\nthe optional `groupWithPrevious` function allows to group an action with the previous one.\n\n### Middleware and reducer\n\nThese reverting actions are supplied to a middleware registered with a reducer on the redux store.\n\n```javascript\nimport { createStore, combineReducers, applyMiddleware } from \"redux\";\nimport {\n  createUndoReducer,\n  createUndoMiddleware\n} from \"@intactile/redux-undo-redo\";\n\nconst undoMiddleware = createUndoMiddleware({ revertingActions });\nconst undoHistory = : createUndoReducer();\nconst store = createStore(\n  combineReducers({ counter, undoHistory }), // add the reducer\n  initialState,\n  applyMiddleware(thunk) // add the middleware\n);\n```\n\n### History size\n\nThe undo and the redo histories are limited to respectively 50 and 10 by default.\nThey can be increased or decreased when the reducer is created:\n\n```javascript\nconst undoHistory = createUndoReducer({\n  undoHistorySize: 200,\n  redoHistorySize: 100\n});\n```\n\n## Usage\n\n### Undo/redo actions\n\n```javascript\nimport { actions, selectors } from \"@intactile/redux-undo-redo\";\nimport { increment, decrement, setValue } from \"./counterReduxModule\";\n\nstore.dispatch(increment()); // counter = 1\nstore.dispatch(increment()); // counter = 2\nconsole.log(selectors.canUndo(store.getState())); // true\n\nstore.dispatch(actions.undo()); // counter = 1\nconsole.log(selectors.canRedo(store.getState())); // true\n\nstore.dispatch(actions.redo()); // counter = 2\n```\n\n### Undo/redo group of actions\n\n```javascript\nstore.dispatch(actions.group(increment(), increment(), increment())); // counter = 3\n\nstore.dispatch(actions.undo()); // counter = 0\nstore.dispatch(actions.redo()); // counter = 3\n```\n\n### Undo/redo group of actions with redux-thunk\n\n```javascript\nstore.dispatch(\n  actions.group(dispatch =\u003e {\n    dispatch(increment());\n    dispatch(increment());\n    dispatch(increment());\n  })\n); // counter = 3\n\nstore.dispatch(actions.undo()); // counter = 0\nstore.dispatch(actions.redo()); // counter = 3\n```\n\n### Group automatically successive actions\n\nIt is possible to group an action with the previous one.\nThe reverting action should be configured with a new function.\n\n```javascript\n[ADD_VALUE]: {\n  action: action =\u003e removeValue(action.payload),\n  groupWithPrevious: (action, previousAction) =\u003e action.type === previousAction.type\n}\n```\n\nIf the previous action have the same type, the actions will be automatically grouped.\n\n```javascript\nstore.dispatch(addValue(1)); // counter = 1\nstore.dispatch(addValue(2)); // counter = 3\nstore.dispatch(addValue(3)); // counter = 6\n\nstore.dispatch(actions.undo()); // counter = 0\nstore.dispatch(actions.redo()); // counter = 6\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fintactile%2Fredux-undo-redo","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fintactile%2Fredux-undo-redo","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fintactile%2Fredux-undo-redo/lists"}