nuxt/dist/app/components/client-only.js

Nuxt is a free and open-source framework with an intuitive and extendable way to create type-safe, performant and production-grade full-stack web applications and websites with Vue.js.

import { cloneVNode, createElementBlock, createStaticVNode, defineComponent, getCurrentInstance, h, onMounted, provide, ref } from "vue";
import { useNuxtApp } from "../nuxt.js";
import { getFragmentHTML } from "./utils.js";
export const clientOnlySymbol = Symbol.for("nuxt:client-only");
export default defineComponent({
  name: "ClientOnly",
  inheritAttrs: false,
  props: ["fallback", "placeholder", "placeholderTag", "fallbackTag"],
  setup(_, { slots, attrs }) {
    const mounted = ref(false);
    onMounted(() => {
      mounted.value = true;
    });
    if (import.meta.dev) {
      const nuxtApp = useNuxtApp();
      nuxtApp._isNuxtPageUsed = true;
      nuxtApp._isNuxtLayoutUsed = true;
    }
    provide(clientOnlySymbol, true);
    return (props) => {
      if (mounted.value) {
        return slots.default?.();
      }
      const slot = slots.fallback || slots.placeholder;
      if (slot) {
        return slot();
      }
      const fallbackStr = props.fallback || props.placeholder || "";
      const fallbackTag = props.fallbackTag || props.placeholderTag || "span";
      return createElementBlock(fallbackTag, attrs, fallbackStr);
    };
  }
});
const cache = /* @__PURE__ */ new WeakMap();
// @__NO_SIDE_EFFECTS__
export function createClientOnly(component) {
  if (cache.has(component)) {
    return cache.get(component);
  }
  const clone = { ...component };
  if (clone.render) {
    clone.render = (ctx, cache2, $props, $setup, $data, $options) => {
      if ($setup.mounted$ ?? ctx.mounted$) {
        const res = component.render?.bind(ctx)(ctx, cache2, $props, $setup, $data, $options);
        return res.children === null || typeof res.children === "string" ? cloneVNode(res) : h(res);
      } else {
        const fragment = getFragmentHTML(ctx._.vnode.el ?? null) ?? ["<div></div>"];
        return import.meta.client ? createStaticVNode(fragment.join(""), fragment.length) : h("div", ctx.$attrs ?? ctx._.attrs);
      }
    };
  } else if (clone.template) {
    clone.template = `
      <template v-if="mounted$">${component.template}</template>
      <template v-else><div></div></template>
    `;
  }
  clone.setup = (props, ctx) => {
    const instance = getCurrentInstance();
    const attrs = { ...instance.attrs };
    const directives = extractDirectives(instance);
    for (const key in attrs) {
      delete instance.attrs[key];
    }
    const mounted$ = ref(false);
    onMounted(() => {
      Object.assign(instance.attrs, attrs);
      instance.vnode.dirs = directives;
      mounted$.value = true;
    });
    return Promise.resolve(component.setup?.(props, ctx) || {}).then((setupState) => {
      if (typeof setupState !== "function") {
        setupState = setupState || {};
        setupState.mounted$ = mounted$;
        return setupState;
      }
      return (...args) => {
        if (mounted$.value) {
          const res = setupState(...args);
          return res.children === null || typeof res.children === "string" ? cloneVNode(res) : h(res);
        } else {
          const fragment = getFragmentHTML(instance?.vnode.el ?? null) ?? ["<div></div>"];
          return import.meta.client ? createStaticVNode(fragment.join(""), fragment.length) : h("div", ctx.attrs);
        }
      };
    });
  };
  cache.set(component, clone);
  return clone;
}
function extractDirectives(instance) {
  if (!instance || !instance.vnode.dirs) {
    return null;
  }
  const directives = instance.vnode.dirs;
  instance.vnode.dirs = null;
  return directives;
}