Writing a custom plugin in Vue

Writing a Vue plugin is rather easy. You just need to use an install method in your plugin to accept Vue as the first argument and options as the second argument:

// plugin.js
export default {
  install (Vue, options) {
    // ...
  }
}

Let's create a simple custom greeting plugin in different languages for a standard Vue app. The language can be configured through the options parameter; English will be used as the default language when no option is provided:

1. Create a /plugins/ folder in the /src/ directory with a basic.js file in it with the following code:

// src/plugins/basic.js
export default {
  install (Vue, options) {
    if (options === undefined) {
      options = {}
    }
    let { language } = options
    let languages = {
      'EN': 'Hello!',
      'ES': 'Hola!'
    }
    if (language === undefined) {
      language = 'EN'
    }
    Vue.prototype.$greet = (name) =...