# HistoryChangeDetail

> _Since v3.10.1_

Event detail emitted whenever the undo/redo history changes.

Fired when an edit is pushed onto the undo stack (by `recordEdit()` outside a
transaction, or by the outermost `endTransaction()` of a non-empty transaction),
after an undo or redo (keyboard or programmatic), and when `clearHistory()`
empties a non-empty history. Bind toolbar buttons' `disabled` state to it.

## Properties

| Property | Type | Description |
| -------- | ---- | ----------- |
| <span id="canundo"></span>`canUndo` | <code>boolean</code> | Whether there is an action that can be undone |
| <span id="canredo"></span>`canRedo` | <code>boolean</code> | Whether there is an action that can be redone |