Undo/Redo support for easy peasy.

patched-undo-peasy depends on an easy peasy fork. (but modifying undo-peasy to depend on stock easy-peasy should be straightforward.)

Usage

1. Attach undoRedoMiddleWare in createStore.

   const store = createStore(appModel, {
     middleware: [undoRedo()],
   });

2. If using typescript, the root application model should extend WithUndo. WithUndo will add types for undo actions and undo history to your root model.

     interface Model extends WithUndo {
       count: number;
       increment: Action<Model>;
     }

3. Wrap the root application instance in undoable. undoable will add types for undo actions and undo history to your root model.

   const appModel: Model = undoable({
     count: 0,
     increment: action((state) => {
       state.count++;
     }),
   });

4. Profit

   const undoAction = useStoreActions((actions) => actions.undoUndo);

Supported Actions

• undoUndo - restore state to the most recently saved version.
• undoRedo - restore state to the most recently undone version.
• undoSave - save current application state to undo history. undoSave is generated automatically by the middleware, but in rare cases it's useful to save manually.
• undoReset - erases saved undo/redo history and saves the current state.

Configuration

The undoRedo() middleware function accepts an optional configuration object.

• noSaveActions - a function that tells undoRedo to not save certain actions to undo/redo history.
• noSaveKeys - a function tthat tells undoRedo not to save certain keys inside the state model to undo/redo history. e.g. view state in the model.