mavlink-devguide/.vitepress/theme/index.js

// https://vitepress.dev/guide/custom-theme
import { h } from "vue";

import DefaultTheme from "vitepress/theme";
import "./style.css";

// To support medium-zoom - like setup()
import { onMounted, watch, nextTick } from "vue";
import { useRoute } from "vitepress";
import mediumZoom from "medium-zoom";

// For https://www.npmjs.com/package/lite-youtube-embed
import { inBrowser } from "vitepress";
import "lite-youtube-embed/src/lite-yt-embed.css";
if (inBrowser) {
  // @ts-ignore
  import("lite-youtube-embed");
}

// Support redirect plugin
import Redirect from "./components/Redirect.vue";

// Tabs: https://github.com/Red-Asuka/vitepress-plugin-tabs
import { Tab, Tabs } from "vue3-tabs-component";
import "@red-asuka/vitepress-plugin-tabs/dist/style.css";

/** @type {import('vitepress').Theme} */
export default {
  extends: DefaultTheme,
  Layout: () => {
    return h(DefaultTheme.Layout, null, {
      // https://vitepress.dev/guide/extending-default-theme#layout-slots
    });
  },
  enhanceApp({ app, router, siteData }) {
    app.component("Redirect", Redirect); //Redirect plugin
    //Tabs: https://github.com/Red-Asuka/vitepress-plugin-tabs
    app.component("Tab", Tab);
    app.component("Tabs", Tabs);
  },

  // to support medium zoom: https://github.com/vuejs/vitepress/issues/854
  setup() {
    const route = useRoute();
    const initZoom = () => {
      //mediumZoom("[data-zoomable]", { background: "var(--vp-c-bg)" });
      mediumZoom(".main img", { background: "var(--vp-c-bg)" });
    };
    onMounted(() => {
      initZoom();
    });
    watch(
      () => route.path,
      () => nextTick(() => initZoom())
    );
  },
  //end to support medium zoom
};