Detailed process of webpack installation, configuration and packaging

Eden Li Bingbing Bingbing 2020-11-10 08:54:26
detailed process webpack installation configuration


introduction

The front end has gone through a long development , There are many practical ways to deal with complex workflow , Make development easier , among , Modularity can make complex programs into small files , and webpack It doesn't force you to use a modular approach , It's about being compatible with all of the modular solutions that allow you to access projects painlessly , This article introduces in detail webpack Detailed process of installation, configuration and packaging .

Webpack Brief introduction

Essentially ,webpack It's a modern JavaScript Application's Static module packager (module bundler). When webpack When processing an application , It builds one recursively Dependency graph (dependency graph), It contains each module required by the application , All these modules are then packaged into one or more bundle.

There are four core concepts

  • entrance (entry): instructions webpack Which module should I use , To build its interior Dependency graph The beginning of . After entering the starting point of the entrance ,webpack It will find out which modules and libraries are the starting points of the entrance ( Direct and indirect ) Rely on the
  • Output (output): tell webpack Where to output the bundles, And how to name these files , The default value is ./dist
  • loader: Give Way webpack To be able to deal with the non JavaScript file (webpack I only understand JavaScript)
  • plug-in unit (plugins): Plug ins can be used to perform a wider range of tasks . The scope of the plug-in includes , Optimize and compress from packaging , Until the variables in the environment are redefined . Plug-in interface It's extremely powerful , Can be used to handle a variety of tasks .

Through a picture on the official website , It can be explained that webpack A powerful , As shown below :

1

Packing steps

Next, I will introduce in detail webpack Detailed process of installation, configuration and packaging

install node.js

You can refer to Baidu , No more repetition here .

Global installation webpack

function CMD, The installation command is as follows , among , -g Global installation , And remove the installation webpack and webpack-cli

npm install webpack webpack-cli –g

Create a local project folder

Create project local folder , Such as “D:\TestWebpack”, stay CMD Enter the following commands in the command window , Switch to this directory

D: // Switch to D disc
cd D:\TestWebpack // Switch to the project directory

Local installation webpack

Enter the following command , Install... In the project directory webpack, among ,--save-dev It's a local installation

npm install webpack webpack-cli --save-dev

see webpack edition

Enter the following command , If version number appears , Description installation successful .

webpack -v

establish package.json file

Enter the following command , Will automatically generate... In the project directory package.json file

npm init -y

Configure packaging Directory

Under the project directory , newly build config Folder , For storing configuration files ;src Folder , For storing source code ;out Folder , Used to store package generation files , The details are shown in the following figure .

1

add to webpack.config.js file

stay config Add in folder webpack.config.js file , And add the following code :

const path=require('path'); // call node.js In the path
module.exports={
entry:{
index:'./src/js/index.js' // Files that need to be packaged
},
output:{
filename:'[name].js', // What is the filename you entered , What are the generated file names
path:path.resolve(__dirname,'../out') // Specify the generated file directory
},
mode:"development" // Development mode , No, right js Equal file compression , By default, compressed files are generated
}

function webpack

stay cmd Command window , Enter the following command , After successful operation , stay out The packed... Will be generated in the directory index.js

webpack --config config/webpack.config.js

To configure package.json

Every time you type a command webpack --config config/webpack.config.js, Too long , And it's very inconvenient , So now we can do this package.json Configuration in file , As shown below :

{
"name": "TestWebpack",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "webpack --config config/webpack.config.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"clean-webpack-plugin": "^3.0.0",
"webpack": "^4.39.3",
"webpack-cli": "^3.3.8"
}
}

When the configuration is complete , We input the following command , It can be packed directly .

npm run start

JS Handling of cache problems

Solve by hash value JS The cache problem ( Without modification JS When you want to pack content , It doesn't repackage a JS file ), modify webpack.config.js file , The specific code is as follows :

const path=require('path');
module.exports={
entry:{
index:'./src/js/index.js'
},
output:{
filename:'[name].[chunkhash:8].js',// increase 8 Bit hash value
path:path.resolve(__dirname,'../out')
},
mode:"development",
}

install webpack plug-in unit clean-webpack-plugin

adopt clean-webpack-plugin Plugins delete old files in the output directory .

Installation command
npm install --save-dev clean-webpack-plugin
Use a
const path=require('path');
const {CleanWebpackPlugin} = require('clean-webpack-plugin');
module.exports={
entry:{
index:'./src/js/index.js'
},
output:{
filename:'[name].[chunkhash:8].js',
path:path.resolve(__dirname,'../out')
},
mode:"development",
plugins:[
new CleanWebpackPlugin()
]
}
Use two
const path=require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin').CleanWebpackPlugin ;
module.exports={
entry:{
index:'./src/js/index.js'
},
output:{
filename:'[name].[chunkhash:8].js',
path:path.resolve(__dirname,'../out')
},
mode:"development",
plugins:[
new CleanWebpackPlugin()
]
}

After the configuration , We run... Again npm run start, here out Directory , There is only one new js file , As shown in the figure below .

1

summary

thus , We finished from webpack install 、 To configure 、 A series of steps, such as packing . The above detailed steps , All pass the author's test , If there is a problem during installation or use , Welcome to leave a message , If this article helps you , Hope to pay attention to and support .

版权声明
本文为[Eden Li Bingbing Bingbing]所创,转载请带上原文链接,感谢

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