yargs脚手架命令注册
查看lerna源码用的就是yargs的库注册脚手架，@vue/cli是自己开发的
command 命令注册
options 参数注册
常用方法
#!/usr/bin/env node const yargs = require("yargs/yargs"); const dedent = require("dedent"); // 使用了.parse(argv, context)就不需要传argv了 // const { hideBin } = require("yargs/helpers"); const pkg = require('../package.json'); const cli = yargs() const ListCmd = require('./command/list') const context = { rainbowVersion: pkg.version, }; const argv = process.argv.slice(2) // dedent去除缩进 cli // 未知命令的提示 // .strict() // $0 值为argv第一个参数 .usage("Usage: $0 <command> [options]") .demandCommand( 1, "A command is required. Pass --help to see all available commands and options." ) // 如果命令输入错误，会提示 .recommendCommands() .alias("h", "help") .alias("v", "version") // 定义多个option参数 .options({ debugger: { defaultDescription: "", describe: "bootstrap debugger mode", type: "boolean", alias: "d", }, }) // 注册单个option参数 .option("register", { describe: "Define Global Option", type: "string", alias: "r", }) .option("ci", { type: "boolean", hidden: true, }) // 定义命令分组 .group(["debugger"], "Dev Options") .group(["register"], "Extra Options") // 当输入错误命令的时候的提示内容 .fail((err,msg) => { /* 此时会把命令中相近的进行提示 是指 init? 无法识别的选项：iii */ console.log(err); }) // 自定义yargs命令,有四个参数 // 可以使用rainbow-test init -h查看帮助文档 .command( "[init [name]]", "Do init a project", (yargs) => { yargs.option("name", { type: "string", describe: "Name of a Project", alias: "n", }); }, (argv) => { console.log(argv); //查看参数 /* { _: [ 'init' ], rainbowVersion: '1.1.0', '$0': '/usr/local/bin/rainbow-test' } */ } ) // Lerna源码使用的就是这种方式，但是yargs帮助文档并没有介绍 .command(ListCmd) .command({ command: "test", aliases: ["t", "te", "tes"], describe: "test local packages", // 在执行脚手架之前完成的东西 ，比如定义私有的options builder: (yargs) => { console.log("test the command"); }, // 具体执行逻辑 handler: function handler(argv) { // return require(".")(argv); console.log(argv); return { initialize() { console.log("initialize"); }, execute() { // piping to `wc -l` should not yield 1 when no packages matched console.log("execute"); }, }; }, }) .command({ command:"start", alias:['s'], describe:"start the project", builder:(yargs)=>{ console.log(''); }, handler:(argv)=>{ console.log(argv); console.log('start'); setTimeout(()=>{ console.log('setTimeout'); },0); new Promise(()=>{ let chain = Promise.resolve(); chain.then(() => console.log("chain1")) chain.then(() => console.log("chain2")) chain.then(() => console.log("chain3")); }) let chain = Promise.resolve(); chain.then(() => console.log("chain4")); setTimeout(()=>{ console.log('setTimeout2'); },0) console.log("end"); } }) // 设置输出的宽度 .wrap(cli.terminalWidth()) // 结尾的时候定义内容 .epilogue( dedent` When a command fails, all logs are written to lerna-debug.log in the current working directory. For more information, find our manual at https://github.com/lerna/lerna ` // 注入参数，比如注册版本号 ) .parse(argv, context);
作者：rainbowdiary
链接：https://juejin.cn/post/7028038864153509925