How to build JS plug-ins and component libraries using Vue?

Vue.js is a popular JavaScript framework whose flexibility and ease of use make it the first choice for building front-end applications. In addition to building applications, Vue.js can also be used to build JavaScript plugins and component libraries, which can be used as standalone packages in other Vue applications. This article will introduce in detail how to use Vue.js to build JavaScript plug-ins and component libraries.

What are Vue plug-ins and component libraries?

Vue plug-ins are reusable JavaScript codes that are encapsulated into Vue plug-ins and can be easily installed and used in Vue applications. Vue plug-ins can add new functionality to Vue applications, such as interacting with backend APIs, handling form validation, handling permissions, handling routing, handling state management, etc. The Vue Component Library is a collection of predefined UI components that can be easily reused in Vue applications.

How to build a Vue plug-in?

Vue plugins are reusable JavaScript code that contain Vue components that can be installed and used in multiple Vue applications. Here are the steps on how to build a Vue plug-in:

Step 1: Install dependencies

First you need to make sure that Vue.js and its dependencies have been installed. When building a Vue plug-in, we need to install vue-cli-service, rollup and corresponding plug-ins.

npm install --save-dev vue-cli-service rollup rollup-plugin-babel rollup-plugin-uglify

Step Two: Create the Project

The next step in building the Vue plugin is to create a new project on your local computer. We can use Vue CLI to create new projects. In the command line, execute the following command:

vue create my-plugin

Step 3: Build the plug-in

We need to write the Vue component inside the plug-in and export the Vue plug-in. To do this, create a new folder in the /src directory to store all Vue plugin code. You can name this folder plugin. In this folder we need to create a plugin file plugin.js. In it, we will export an install method and Vue component.

// 导出 install 方法
export function install(Vue) {
  Vue.component('my-component', {
    // ... 组件详情
  })
}

// 导出组件
export MyComponent from './components/MyComponent.vue'

Then, we need to create an entry file so that users can use the plug-in. In the entry file, we need to import the required Vue components and code, and then use the Vue.use() method to install the Vue plug-in.

import { MyComponent, install } from './plugin'

// 在 Vue.use() 之前，安装插件
install(Vue)

// 注册组件
Vue.component(MyComponent.name, MyComponent)

Finally, we need to create a rollup configuration file for the plugin, which can package all JavaScript code into a JavaScript file and export it to the dist folder.

import babel from 'rollup-plugin-babel';
import { uglify } from 'rollup-plugin-uglify';

export default {
  input: './src/plugin/plugin.js',
  output: {
    name: 'MyPlugin',
    file: './dist/my-plugin.min.js',
    format: 'umd'
  },
  plugins: [
    babel(),
    uglify()
  ]
}

The last step to package the plug-in is to execute the following command in the command line:

rollup -c

Step 4: Publish the plug-in

The packaged Vue plug-in can be published directly to npm in the registry. Before publishing a plugin, you must create and register an npm account according to the official npm documentation. You need to log in to npm on the command line and execute the following command:

npm publish

How to build a Vue component library?

Building a Vue component library requires following similar steps to building a Vue plug-in. The component library is a collection of predefined UI components that can be easily reused. The following are the steps to build a Vue component library:

Step 1: Install dependencies

First you need to make sure that Vue.js and its dependencies have been installed. When building the Vue component library, we need to install vue-cli-service, rollup and corresponding plug-ins.

npm install --save-dev vue-cli-service rollup rollup-plugin-babel rollup-plugin-uglify

Step 2: Create a project

We can use Vue CLI to create a new project. In the command line, execute the following command:

vue create my-component-library

In the component library project, we will create an independent /src directory to store all component codes. Within the /src directory, we can create a new folder src/components and add our component files there.

Step 3: Build components

We need to write Vue components in /src/components and export each Vue component. All components can be collected in one index.js for unified use in the main.js file.

import MyComponent from './MyComponent.vue'
import MyOtherComponent from './MyOtherComponent.vue'

export default {
  MyComponent,
  MyOtherComponent
}

After the component is written and introduced into the /index.js file, we can use rollup to package the component library code.

Step 4: Packaging the component library

Similar to packaging the Vue plug-in, we need to create a rollup configuration file for the component library to package all JavaScript code and export it to the dist directory.

import babel from 'rollup-plugin-babel';
import { uglify } from 'rollup-plugin-uglify';

export default {
  input: './src/index.js',
  output: {
    name: 'MyComponentLibrary',
    file: './dist/my-component-library.min.js',
    format: 'umd'
  },
  plugins: [
    babel(),
    uglify()
  ]
}

The last step to package the component library code is to execute the following command on the command line:

rollup -c

Step 5: Publish the component library

The packaged Vue component library can Publish directly to the npm registry. Before publishing a component library, you must create and register an npm account according to the official npm documentation. You need to log into npm at the command line and execute the following command:

npm publish

Conclusion

Vue.js is a very flexible front-end framework that can be used in a variety of ways. Building Vue plugins and component libraries are two of them. The process of creating Vue plugins and component libraries is basically the same, as they are both generated from Vue components. Vue plugins can add new Vue functionality, while Vue component libraries provide collections of components that can be easily reused. By following the steps listed above, you can build your own library of JavaScript plugins and components using Vue.js, making code reuse easier and automated.

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