Tldraw/packages/tldraw/src/state/commands/changePage/changePage.ts

import type { Data, TLDrawCommand } from '~types'

export function changePage(data: Data, pageId: string): TLDrawCommand {
  return {
    id: 'change_page',
    before: {
      appState: {
        currentPageId: data.appState.currentPageId,
      },
    },
    after: {
      appState: {
        currentPageId: pageId,
      },
    },
  }
}