Try out a Vue.js Plugin - A Comprehensive Guide

Currently, I am delving into the world of . In my journey, I have crafted a plugin that takes the form of:

source/myPlugin.js

const MyPlugin = {
  install: function(Vue, options) {
    console.log('installing my plugin');

    Vue.myMethod = function() {
    };
  }
}

For the purpose of testing this plugin, I decided to use Jest. However, my mind is open to exploring other testing frameworks. As of now, I have laid out the following structure in my test/myPlugin.test.js file:

test/myPlugin.test.js

const Vue = require('vue/dist/vue');
const MyPlugin = require('../source/myPlugin');

Vue.use(MyPlugin);

describe('MyPlugin', () => {
    let vm;

    beforeEach(() => {
        const template = `<div id="app"></div>`;
        vm = new Vue({
            template
        }).$mount();
    });

    it('should run', () => {
        Vue.myMethod();
        expect(true).toEqual(true);        
    });
});

Upon running the test with Jest, my expectation was to witness "installing my plugin" displayed in the console. Unfortunately, this was not the case as the output indicated:

TypeError: Vue.myMethod is not a function

Where could I possibly be faltering? My aim here is to establish a fundamental plugin alongside its tests. Any guidance or insights on what might be going wrong would be immensely valuable.

Answer №1

It is not common practice to attach methods directly to the Vue object like this. Typically, you would add them to the prototype.

Vue.prototype.myCustomMethod = function() {};

Then you can call it by using

vm.myCustomMethod()

console.clear()

const MyNewPlugin = {
  install: function(Vue, options) {
    console.log('installing my new plugin');

    Vue.prototype.myCustomMethod = function() {
      console.log("custom method called")
    };
  }
}
Vue.use(MyNewPlugin);

const template = `<div id="app"></div>`;
vm = new Vue({
  template
}).$mount();

vm.myCustomMethod();
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="5c2a29391c6e726e726a">[email protected]</a>/dist/vue.js"></script>

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