How to use the slate-hotkeys.isSplitBlock function in slate-hotkeys

function onKeyDown(event, editor, next) {
    debug('onKeyDown', { event })

    const { value } = editor
    const { document, selection } = value
    const { start } = selection
    const hasVoidParent = document.hasVoidParent(start.path, editor)

    // COMPAT: In iOS, some of these hotkeys are handled in the
    // `onNativeBeforeInput` handler of the `<content>` component in order to
    // preserve native autocorrect behavior, so they shouldn't be handled here.
    if (Hotkeys.isSplitBlock(event) &amp;&amp; !IS_IOS) {
      return hasVoidParent
        ? editor.moveToStartOfNextText()
        : editor.splitBlock()
    }

    if (Hotkeys.isDeleteBackward(event) &amp;&amp; !IS_IOS) {
      return editor.deleteCharBackward()
    }

    if (Hotkeys.isDeleteForward(event) &amp;&amp; !IS_IOS) {
      return editor.deleteCharForward()
    }

    if (Hotkeys.isDeleteLineBackward(event)) {
      return editor.deleteLineBackward()
    }</content>

// Certain hotkeys have native editing behaviors in `contenteditable`
    // elements which will editor the DOM and cause our value to be out of sync,
    // so they need to always be prevented.
    if (
      !IS_IOS &&
      (Hotkeys.isBold(event) ||
        Hotkeys.isDeleteBackward(event) ||
        Hotkeys.isDeleteForward(event) ||
        Hotkeys.isDeleteLineBackward(event) ||
        Hotkeys.isDeleteLineForward(event) ||
        Hotkeys.isDeleteWordBackward(event) ||
        Hotkeys.isDeleteWordForward(event) ||
        Hotkeys.isItalic(event) ||
        Hotkeys.isRedo(event) ||
        Hotkeys.isSplitBlock(event) ||
        Hotkeys.isTransposeCharacter(event) ||
        Hotkeys.isUndo(event))
    ) {
      event.preventDefault()
    }

    isUserActionPerformed = true
    debug('onKeyDown', { event })
    next()
  }