@vuepress-reco/style-default/lib/client/clientAppSetup.js

It is default type of vuepress-theme-reco.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const vue_1 = require("vue");
const client_1 = require("@vuepress/client");
const composables_1 = require("./composables");
const client_2 = require("@vuepress/plugin-theme-data/lib/client");
exports.default = client_1.defineClientAppSetup(() => {
    // we need to access sidebar items in multiple components
    // so we make it global computed
    const themeLocale = client_2.useThemeLocaleData();
    const frontmatter = client_1.usePageFrontmatter();
    const sidebarItems = vue_1.computed(() => composables_1.resolveSidebarItems(frontmatter.value, themeLocale.value));
    vue_1.provide(composables_1.sidebarItemsSymbol, sidebarItems);
    const pageHeaders = vue_1.computed(() => composables_1.resolvePageHeaders());
    vue_1.provide(composables_1.pageHeadersSymbol, pageHeaders);
});