使用npm 安装相应的模块
webpack 4 需要安装 webpack、webpack-cli 和 typescript 等必要的模块。为了使用 webpack 处理 typescript，还需要 ts-loader。
在VSCode的终端输入以下命令
1、初始化项目：
npm init
回答一系列的问题（也可以直接回车使用默认值）后，在当前项目文件夹中会出现一个package.json的配置文件。文件内容大概如下所示：
{ "name": "webpacktypescript", "version": "1.0.0", "description": "", "main": "index.js", "dependencies": { "ts-loader": "^4.2.0", "typescript": "^2.8.1", "webpack": "^4.6.0", "webpack-cli": "^2.0.14" }, "devDependencies": {}, "scripts": { "test": "echo "Error: no test specified" && exit 1" }, "author": "", "license": "ISC" }
2、安装需要的各个模块：
npm install webpack webpack-cli typescript ts-loader --save-dev
3、手动添加 TypeScript 的配置文件 tsconfig.json：
{ "compilerOptions": { "module": "commonjs", "target": "es5", "sourceMap": true }, "exclude": [ "node_modules" ] }
4、添加index.html及默认的 src/index.js文件
在项目文件夹中添加html文件，并命名为：'index.html',并编辑文件内容如下所示：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>TypeScript + Webpack 4</title> </head> <body> <script src="dist/main.js"></script> </body> </html>
5、在项目文件夹中添加名字为src的文件夹，并在该文件夹中添加名字为index.js的JavaScript文件,文件内容如下所示：
console.log("Hello TypeScript!");
完成以上操作后项目的结构如下所示：
webpackwithtypescript
|- src
|- index.js
|- index.html
|- package.json
|- package-lock.json
|- tsconfig.json
6.使用webpack-cli打包项目，输入以下命令：
npx webpack
其中npx详解请参照：https://www.cnblogs.com/vickylinj/p/12228834.html
执行后控制台显示内容如下所示：
D:SPAProjectswebpacktypescript>npx webpack npx: installed 1 in 11.482s The "path" argument must be of type string D:SPAProjectswebpacktypescript ode_moduleswebpackinwebpack.js Hash: 7dffdd50a425c0f906c2 Version: webpack 4.6.0 Time: 579ms Built at: 2018-04-18 14:23:26 Asset Size Chunks Chunk Names main.js 577 bytes 0 [emitted] main Entrypoint main = main.js [0] ./src/index.js 33 bytes {0} [built]
7、打包成功，项目文件夹中会多出 dist/main.js
这也正是 webpack 4 未指定输出文件时默认的位置。此时在浏览器中打开index.html，并在浏览器中按下F12，进入控制台将会看到 consolr.log() 语句的输出结果。
此时的项目文件夹结构：
webpackwithtypescript |- dist |- main.js |- src |- index.js |- index.html |- package.json |- package-lock.json |- tsconfig.json
webpack 4 没有配置文件时，使用src/index.js作为默认入口，同时使用dist/main.js作为默认出口。
由于TyepScript文件的默认扩展名为.ts，所以并不适合于没有配置文件的默认状况。
8、webpack 配置文件
在项目文件夹中添加名为webpack.config.js的JavaScript文件，并编辑其内容如以下所示：
const path = require('path');
module.exports = {
mode: 'development',
entry: './src/index.ts',
output: {
filename: 'main.js',
path: path.resolve(__dirname, 'dist')
},
module: {
rules: [{
test: /.ts$/,
use: "ts-loader"
}]
},
resolve: {
extensions: [
'.ts'
]
}
};
9、同时修改package.json如以下内容所示：
{ "name": "webpacktypescript", "version": "1.0.0", "description": "", "main": "index.js", "dependencies": { "ts-loader": "^4.2.0", "typescript": "^2.8.1", "webpack": "^4.6.0", "webpack-cli": "^2.0.14" }, "devDependencies": {}, "scripts": { "build": "webpack", //添加这一行 "test": "echo "Error: no test specified" && exit 1" }, "author": "", "license": "ISC" }
10、完成以上的设置，然后将src/index.js改名为src/index.ts。
webpackwithtypescript |- dist |- main.js |- src |- index.ts |- index.html |- package.json |- package-lock.json |- tsconfig.json
11、使用npm run build命令编译、打包src/index.ts文件：
D:SPAProjectswebpacktypescript>npm run build > webpacktypescript@1.0.0 build D:SPAProjectswebpacktypescript > webpack Hash: 9bf0b33a5a6b242a917e Version: webpack 4.6.0 Time: 1683ms Built at: 2018-04-18 15:03:36 Asset Size Chunks Chunk Names main.js 2.84 KiB main [emitted] main Entrypoint main = main.js [./src/index.ts] 35 bytes {main} [built]
在控制台窗口可以输入npm run build指令进行打包时，项目中src文件夹中的ts文件index.ts被编译，并输出为 dist/main.js。
12、输出文件名使用hash值
12.1、修改index.html模板，删除script节点
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>TypeScript + Webpack 4</title> </head> <body> </body> </html>
12.2、修改webpack.config.js
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin')
module.exports = {
mode: 'development',
entry: './src/index.ts',
output: {
filename: '[hash].js',//main.s=>[hash].js
path: path.resolve(__dirname, 'dist')
},
module: {
rules: [{
test: /.ts$/,
use: "ts-loader"
}]
},
resolve: {
extensions: [
'.ts'
]
},
//新增配置，根据html模板自动生成带hash名script的html文件
plugins:[
new HtmlWebpackPlugin({
filename: path.resolve(__dirname, './dist/index.html'),
template: 'index.html',
inject: true,
minify: {
removeComments: true,
collapseWhitespace: true,
removeAttributeQuotes: true
// more options:
// https://github.com/kangax/html-minifier#options-quick-reference
},
// necessary to consistently work with multiple chunks via CommonsChunkPlugin
chunksSortMode: 'dependency'
})
]
};
12.3、build控制台输出结果
Hash: 3003e0c5c17280f9a87b Version: webpack 4.41.5 Time: 1038ms Built at: 2020-01-22 11:25:39 Asset Size Chunks Chunk Names 3003e0c5c17280f9a87b.js 3.81 KiB main [emitted] [immutable] main index.html 185 bytes [emitted] Entrypoint main = 3003e0c5c17280f9a87b.js [./src/index.ts] 35 bytes {main} [built] Child html-webpack-plugin for "index.html": 1 asset Entrypoint undefined = index.html [./node_modules/html-webpack-plugin/lib/loader.js!./index.html] 360 bytes {0} [built] [./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 472 bytes {0} [built] [./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 497 bytes {0} [built] + 1 hidden module
12.4、build文件输出结果（js文件的hash值与12.3输出结果的Hash一致）
index.html：
<!DOCTYPE html><html lang=en><head><meta charset=UTF-8><title>TypeScript + Webpack 4</title></head><body><script type=text/javascript src=3003e0c5c17280f9a87b.js></script></body></html>