$ npm i -D @storybook/addon-actions

// /.storybook/addons.jsに1行追記
import '@storybook/addon-actions/register'

// /.storybook/config.js
import Vue from 'vue'

import { configure } from '@storybook/vue'
import { action } from '@storybook/addon-actions'

Vue.component('nuxt-link', {
  props:   ['to'],
  methods: {
    log() {
      action('link target')(this.to)
    },
  },
  template: '<a href="#" @click.prevent="log()"><slot>NuxtLink</slot></a>',
})

const req = require.context('../src/stories', true, /\.stories\.js$/);
function loadStories() {
  req.keys().forEach(filename => req(filename));
}

configure(loadStories, module);