Function isHistoryStack

packages/plugins/history/src/history-stack.ts:26–34

* Check if a value is a `History` object.

(value: any)

   */

  isHistoryStack(value: any): value is HistoryStack {
    return (
      isPlainObject(value) &&
      Array.isArray(value.redos) &&
      Array.isArray(value.undos) &&
      (value.redos.length === 0 || Operation.isOperationList(value.redos[0].operations)) &&
      (value.undos.length === 0 || Operation.isOperationList(value.undos[0].operations))
    )
  },

  set(editor: Editor, stack: HistoryStack = { undos: [], redos: [] }): void {
    HISTORY_STACK.set(editor, stack)