message: refactor(theme): mark enum as const
diff: import type { ReadingTime } from "vuepress-plugin-reading-time2";
  import type { Author } from "vuepress-shared";
  -export enum ArticleInfoType {
  +export const enum ArticleInfoType {
  type = "y",
  title = "t",
  shortTitle = "s",
  @@ -19,7 +19,7 @@ export enum ArticleInfoType {
  cover = "v",
  }
  -export enum PageType {
  +export const enum PageType {
  article = "a",
  home = "h",
  slide = "s",
  