Vue Segment Analytics Plugin

Common errors

• TypeError: Cannot read properties of undefined (reading '$segment')

  cause This error occurs when trying to access `this.$segment` within a Vue component, but the `vue-segment-analytics` plugin has not been correctly installed via `Vue.use()` or if the component is somehow outside the scope of the Vue instance where the plugin was installed.
  fix Ensure `Vue.use(VueSegmentAnalytics, { id: 'YOUR_SEGMENT_WRITE_KEY' })` is called before instantiating your Vue app. Verify that the component attempting to access `$segment` is part of the Vue instance tree.

• Segment events are not being sent or are not visible in the Segment debugger.

  cause This is typically caused by an incorrect or missing Segment 'Write Key' (`id` property in the options), network blocking (e.g., ad blockers, corporate firewalls), or incorrect event payload structure.
  fix Double-check your `id` configuration in `Vue.use()`. Ensure it matches your Segment project's Write Key. Use the browser's network tab or Segment's debugger to inspect network requests. Temporarily disable ad blockers during development.

• Error: 'Vue' is not defined or 'Vue' is not a constructor

  cause This usually indicates that Vue is not correctly imported or globally exposed in your project environment, or you are attempting to use the plugin in a non-Vue 2 environment.
  fix Make sure you have `import Vue from 'vue'` at the top of your main JavaScript file and that you are using Vue 2. If using CommonJS, ensure Vue is properly `require`d and exposed.

Warnings

• breaking This package is specifically built for Vue 2 applications. It is not compatible with Vue 3 due to fundamental changes in Vue's API and plugin system.
  Fix: For Vue 3 projects, use the official `@segment/analytics-vue` package provided by Segment. For existing Vue 2 projects, ensure your Vue version matches the `^2.0.0` requirement.
• deprecated The official Segment recommendation for modern Vue projects (especially Vue 3) is to use the `@segment/analytics-vue` package. This `vue-segment-analytics` package is considered a legacy solution primarily for existing Vue 2 applications.
  Fix: For new projects or if migrating to Vue 3, consider using `@segment/analytics-vue`. For ongoing Vue 2 projects, be aware that active feature development for this package is minimal, focusing on maintenance.
• gotcha The package has seen infrequent updates since mid-2022, primarily for dependency bumps. New features or rapid bug fixes are unlikely, indicating it is in maintenance mode.
  Fix: Assess the stability and feature set required for your project. If you need advanced features or rapid updates, you might need to contribute or consider alternative integration methods.

Install

• npm install vue-segment-analytics npm
• yarn add vue-segment-analytics yarn
• pnpm add vue-segment-analytics pnpm

Imports

• Vue
  wrong:

  import { Vue } from 'vue'

  correct:

  import Vue from 'vue'

  Vue 2 uses a default export for the Vue constructor. Named imports are incorrect for the main Vue object.
• VueSegmentAnalytics
  wrong:

  const VueSegmentAnalytics = require('vue-segment-analytics')

  correct:

  import VueSegmentAnalytics from 'vue-segment-analytics'

  The library is primarily designed for ESM environments, though transpilation might allow CJS. Stick to ESM for modern Vue 2 builds.
• $segment
  wrong:

  Segment.track('Event Name')

  correct:

  this.$segment.track('Event Name', { property: 'value' })

  After installation with `Vue.use()`, Segment methods are exposed on the Vue instance via `this.$segment` in components.

Quickstart

This quickstart demonstrates how to install and initialize `vue-segment-analytics` with a Vue 2 application, including optional router integration for automatic page tracking and a basic example of manually tracking an event.

import Vue from 'vue';
import VueRouter from 'vue-router';
import VueSegmentAnalytics from 'vue-segment-analytics';

Vue.use(VueRouter);
const router = new VueRouter({
  routes: [{ path: '/', component: { template: '<div>Home</div>' } }]
});

Vue.use(VueSegmentAnalytics, {
  id: process.env.SEGMENT_WRITE_KEY ?? 'YOUR_SEGMENT_WRITE_KEY',
  router: router, // Optional: Pass Vue Router instance for automatic page tracking
  debug: process.env.NODE_ENV !== 'production'
});

new Vue({
  router,
  el: '#app',
  template: `
    <div>
      <h1>Welcome</h1>
      <button @click="trackClick">Track Me</button>
      <router-view></router-view>
    </div>
  `,
  methods: {
    trackClick() {
      this.$segment.track('Button Clicked', { buttonName: 'Track Me' });
      console.log('Segment event tracked: Button Clicked');
    }
  },
  mounted() {
    this.$segment.page('Home Page View', { path: '/' });
    console.log('Segment event tracked: Home Page View');
  }
});