yargs入门

yargs开源参考

lerna:
lerna-git:

参数演示

#!/usr/bin/env node

const yargs = require("yargs/yargs");
const { hideBin } = require("yargs/helpers");
const args = hideBin(process.argv);
const cli = yargs(args)
const dedent = require('dedent')

cli.usage('Usage: cli-test [command] <options>')
    .demandCommand(1, `A command is requied. Pass --help to see all available commands and options`)
    .strict()
    .recommendCommands() // 控制台提示拼写相似的命令
    .fail((err, msg) => { // 命令执行失败是错误信息
        console.log('err', err)
        console.log('msg', msg)
    })
    .alias('h', 'help')
    .alias('v', 'version')
    .wrap(cli.terminalWidth())
    .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 `)) // 结尾
    .options({
        debug: {
            type: 'boolean',
            decribe: 'Boolean debug mode',
            alias: 'd'
        }
    })
    .option('ci', {
        type: 'string',
        decribe: 'Define global registry',
        alias: 'r'
    })
    .group(['debug'], 'Dev Options')
    .group(['registry'], 'Extra Options')
    .command('init [name]', 'Do init a project', (yargs) => {
        yargs
            .option('name', {
                type: 'string',
                decribe: ' Name of a project',
                alias: 'n'
            });
    }, (argv) => { console.log(argv)})
    .command({
        command: 'list',
        aliases: ["ls", "la", "ll"],
        describe: 'List local packages',
        builder: (yargs) => {

        },
        handler: (argv) => {
            console.log('argv', argv)
        }
    })
    .argv;