1、初始化配置：

{
  "name": "hahaya",
  "version": "1.0.1",
  "description": "",
  "main": "index.js",
  "bin": {
    "hahaya": "bin/index.js"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

#!/usr/bin/env node
const yargs = require('yargs')
//帮助处理参数解析
const { hideBin } = require('yargs/helpers')
const arg = hideBin(process.argv)
console.log(yargs(arg).argv)

先使用npm link，建立软链接

1、usage 配置 cli 的开始内容

.usage('Usage: hahaya [command] <options>')

2、.demandCommand

(1, ‘A command is required. Pass —help to see all available commands and options.’) 最少要有一个参数，否则提示

3、.alias(‘h’, ‘help’) 设置别名

4、.wrap(100) 设置宽度

cli.terminalWidth() 与终端的宽一致

5、epilogue 结尾配置 dedent 去掉缩进，位于句首

.epilogue(dedent<br /> When a command fails, all logs are written to lerna-debug.log in the current working directory.<br /> For more information, find our manual at https://github.com/lerna/lerna<br />)

6、argv 打印到控制台上

7、配置选项

const opts = {
  loglevel: {
    defaultDescription: 'info',
    describe: 'What level of logs to report.',
    type: 'string'
  },
   ...
}
  .options(opts)

8、将选项分组

 // 得到这个option的名称
const globalKeys = Object.keys(opts).concat(["help", "version"]);
// 对 options 进行分组
.group(globalKeys, 'Global Options:')
  .options(opts)
  .options({
  debug: {
    type: 'boolean',
    describe: 'Bootstrap debug mode',
    alias: 'd'
  }
})
.group(['debug'], 'dev Options:')

9、添加了一个隐藏的 option，界面不会显示

  .option('ci', {
    hidden: true,
    type: 'boolean'
  }).argv

2、完整的bin/index.js代码

#!/usr/bin/env node
const yargs = require('yargs')
const dedent = require('dedent')
const os = require('os')
//帮助处理参数解析
const { hideBin } = require('yargs/helpers')
const arg = hideBin(process.argv)
const cli = yargs(arg)
const opts = {
  loglevel: {
    defaultDescription: 'info',
    describe: 'What level of logs to report.',
    type: 'string'
  },
  concurrency: {
    defaultDescription: os.cpus().length,
    describe: 'How many processes to use when lerna parallelizes tasks.',
    type: 'number',
    requiresArg: true,
    hidden: true //是否显示在终端
  },
  'reject-cycles': {
    describe: 'Fail if a cycle is detected among dependencies.',
    type: 'boolean'
  },
  'no-progress': {
    describe: 'Disable progress bars. (Always off in CI)',
    type: 'boolean'
  },
  progress: {
    // proxy for --no-progress
    hidden: true,
    type: 'boolean'
  },
  'no-sort': {
    describe: 'Do not sort packages topologically (dependencies before dependents).',
    type: 'boolean'
  },
  sort: {
    // proxy for --no-sort
    hidden: true,
    type: 'boolean'
  },
  'max-buffer': {
    describe: 'Set max-buffer (in bytes) for subcommand execution',
    type: 'number',
    requiresArg: true
  }
}
const globalKeys = Object.keys(opts).concat(['help', 'version'])
//配置宽度
// 配置 cli 结尾的内容
//配置结尾
// 配置 cli 结尾的内容
cli
  //cli 配置首行
  .usage('Usage: hahaya [command] <options>')
  // 配置输入的最小命令,为1，否则弹出提示
  .demandCommand(1, 'A command is required. Pass --help to see all available commands and options.')
  // 开启严格模式
  .strict()
  //命令别名
  //命令别名
  .alias('h', 'help')
  .alias('v', 'version')
  // 配置cli的宽度和命令行一样
  .wrap(cli.terminalWidth())
  //epilogue 配置结尾
  .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
    `
  )
  // 对 options 进行分组
  .group(globalKeys, 'Global Options:')
  .options(opts)
  .options({
    debug: {
      type: 'boolean',
      describe: 'Bootstrap debug mode',
      alias: 'd'
    }
  })
  .group(['debug'], 'dev Options:')
  // 添加了一个隐藏的 option
  .option('ci', {
    hidden: true,
    type: 'boolean'
  }).argv