Vue3+TS+Vite development skills: How to use Vite for code splitting and on-demand loading

Vue3 TS Vite development skills: How to use Vite for code splitting and on-demand loading

With the complexity of front-end engineering and the increase of project scale, the code Optimization has become a problem that every developer must face. An important aspect of this is code splitting and on-demand loading. Code splitting can divide the entire project code into small pieces, and on-demand loading can load the corresponding code when needed, effectively improving the performance and loading speed of web pages. In the Vue3 TypeScript project, we can achieve code splitting and on-demand loading optimization by using the Vite build tool.

1. What is Vite?

Vite is a front-end construction tool based on ESM. It uses the characteristics of native ES modules to achieve faster cold start and hot update, and supports optimization functions such as on-demand loading and code splitting.

2. The use of code splitting

In the Vue3 TypeScript project, we can use the import function provided by Vite to implement on-demand loading and splitting of code. We can reduce the loading pressure of the entire page by dividing the code into different modules and loading the corresponding modules only when needed.

1. Installing Vite

First, we need to install Vite in the project. It can be installed through npm or yarn:

npm install -g create-vite 构建工具初始化
create-vite my-project 初始化新的项目
cd my-project 进入项目目录
npm install 安装依赖

2. Loading modules on demand

In Vue3, we can implement on-demand loading by using the import function. For example, we can use the import function to load specific modules where they are needed, instead of loading all modules at once.

import { createApp, defineAsyncComponent } from 'vue'
import { createRouter, createWebHistory } from 'vue-router'

const Home = defineAsyncComponent(() => import('./views/Home.vue'))
const About = defineAsyncComponent(() => import('./views/About.vue'))

const routes = [
  { path: '/', component: Home },
  { path: '/about', component: About }
]

const router = createRouter({
  history: createWebHistory(),
  routes
})

createApp(App).use(router).mount('#app')

In the above example, we used the defineAsyncComponent function to create an asynchronous component, and then loaded the Home and About components on demand through the import function. This can effectively reduce the file size required for first-screen loading and improve page loading speed.

3. Configure on-demand loading of Vite

In Vite, we can configure vite.config.js to implement on-demand loading and segmentation of code.

1. Installing dependencies

Before using on-demand loading and splitting code in the project, we need to install the corresponding dependencies:

npm install @vitejs/plugin-legacy

2. Configuration vite.config.js

Create a vite.config.js file in the project root directory and add the following code:

import legacy from '@vitejs/plugin-legacy'

export default {
  plugins: [
    legacy({
      targets: ['defaults', 'not IE 11']
    })
  ]
}

In the above code, we have used @ vitejs/plugin-legacy plug-in, and specify the browsers that need to be supported through the targets option, where 'defaults' means that modern browsers are supported, and 'not IE 11' means that IE11 browsers are not supported.

3. Compile project

Through the above configuration, we have completed the configuration of loading and splitting code on demand. Next, we can compile the project by running the following command:

npm run build

After the compilation is completed, Vite will automatically split the code and load the corresponding modules as needed.

Through the above configuration, we have successfully used Vite to implement on-demand loading and splitting of code. This can effectively improve the performance and loading speed of the project and reduce the loading volume of the entire page. In Vue3 TypeScript projects, using Vite for code splitting and on-demand loading is a very good choice. It can make our projects more efficient and optimized, and improve user experience.

Summary:

This article introduces how to use Vite to implement code splitting and on-demand loading of Vue3 TypeScript projects. By configuring Vite's on-demand loading, we can split the entire project's code into small pieces on demand instead of loading all modules at once, thereby improving page performance and loading speed. As a front-end construction tool based on ESM, Vite achieves faster cold start and hot update by taking advantage of the characteristics of native ES modules, while supporting optimization functions such as on-demand loading and code splitting. In actual projects, we can configure Vite according to specific needs to achieve the best performance optimization effect. I hope this article will be helpful to everyone in optimizing code splitting and on-demand loading in Vue3 TypeScript projects.

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