vuetify/lib/install.js

import OurVue from 'vue';
import { consoleError } from './util/console';
export function install(Vue, args = {}) {
  if (install.installed) return;
  install.installed = true;

  if (OurVue !== Vue) {
    consoleError('Multiple instances of Vue detected\nSee https://github.com/vuetifyjs/vuetify/issues/4068\n\nIf you\'re seeing "$attrs is readonly", it\'s caused by this');
  }

  const components = args.components || {};
  const directives = args.directives || {};

  for (const name in directives) {
    const directive = directives[name];
    Vue.directive(name, directive);
  }

  (function registerComponents(components) {
    if (components) {
      for (const key in components) {
        const component = components[key];

        if (component && !registerComponents(component.$_vuetify_subcomponents)) {
          Vue.component(key, component);
        }
      }

      return true;
    }

    return false;
  })(components); // Used to avoid multiple mixins being setup
  // when in dev mode and hot module reload
  // https://github.com/vuejs/vue/issues/5089#issuecomment-284260111


  if (Vue.$_vuetify_installed) return;
  Vue.$_vuetify_installed = true;
  Vue.mixin({
    beforeCreate() {
      const options = this.$options;

      if (options.vuetify) {
        options.vuetify.init(this, options.ssrContext);
        this.$vuetify = Vue.observable(options.vuetify.framework);
      } else {
        this.$vuetify = options.parent && options.parent.$vuetify || this;
      }
    }

  });
}
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