webpack-cli在webpack打包中的作用小结

npm install webapck webpack-cli --save-dev

"scripts": {
    "build": "webpack --config wk.config.js"
 }

# unix 系统默认可执行文件，必须输入完整文件名
webpack
​
# windows cmd 中默认的可执行文件
webpack.cmd
​
# windows Powershell 中可执行文件，可以跨平台
webpack.ps1

#!/bin/sh
basedir=$(dirname "$(echo "$0" | sed -e 's,\,/,g')")
​
case `uname` in
    *CYGWIN*|*MINGW*|*MSYS*) basedir=`cygpath -w "$basedir"`;;
esac
​
if [ -x "$basedir/node" ]; then
  "$basedir/node"  "$basedir/../webpack/bin/webpack.js" "$@"
  ret=$?
else 
  node  "$basedir/../webpack/bin/webpack.js" "$@"
  ret=$?
fi
exit $ret

// 该函数用于执行命令，例如用于下载需要的包
const runCommand = (command ,args) => {}
​
// 判断该包是否安装
const isInstalled = packageName => {}
​
// 该函数用于执行webpack-cli包中bin目录下的cli.js文件
const runCli = cli => {
    const path = require("path");
    const pkgPath = require.resolve(`${cli.package}/package.JSON`);
    // pkgPath: D:\webpack\node_modules\webpack-cli\package.json
    const pkg = require(pkgPath);
    // pkg: webpack-cli的package.json 中的配置
    // path.resolve(path.dirname(pkgPath), pkg.bin[cli.binName]): D:\webpack\node_modules\webpack-cli\bin\cli.js
    require(path.resolve(path.dirname(pkgPath), pkg.bin[cli.binName]));
}
​
if (!cli.installed) {
    // 判断 webpack-cli 是否安装
    // 如果没有安装，询问用于是否安装 webpack-cli
    ...
    ...
} else {
    runCli(cli);
}

#!/usr/bin/env node
​
"use strict";
​
const importLocal = require("import-local");
const runCLI = require("../lib/bootstrap");
​
if (!process.env.WEBPACK_CLI_SKIP_IMPORT_LOCAL) {
  // Prefer the local installation of `webpack-cli`
  if (importLocal(__filename)) {
    return;
  }
}
​
process.title = "webpack";
​
runCLI(process.argv);

const WebpackCLI = require("./webpack-cli");
​
const runCLI = async (args) => {
  // Create a new instance of the CLI object
  const cli = new WebpackCLI();
​
  try {
    await cli.run(args);
  } catch (error) {
    cli.logger.error(error);
    process.exit(2);
  }
};
​
module.exports = runCLI;

[
  'E:\nodejs\node.exe',
  'D:\webpack\node_modules\webpack\bin\webpack.js',
  '--config',
  'wk.config.js'
]