使用typescript快速开发一个cli的实现示例

npm init

{
 "name": "cli-demo",
 "version": "0.0.1",
 "description": "cli demo",
 "keywords": [
 "cli"
 ],
 "bin": {
 "cli-demo": "dist/index.js"
 }
 ...
}

yarn add commander inquirer

yarn add typescript rollup rollup-plugin-terser rollup-plugin-typescript2 @types/inquirer -D

{
 "compilerOptions": {
 "target": "ES6",
 "module": "ESNext",
 "sourceMap": false,
 "declaration": false,
 "outDir": "./dist",
 "moduleResolution": "Node",
 "esModuleInterop": true,
 "resolveJsonModule": true,
 "removeComments": false,
 "importHelpers": true,
 "strict": true,
 "lib": ["ES6", "DOM"]
 },
 "include": ["src"]
}

import typescript from 'typescript'
import json from '@rollup/plugin-json'
import { terser } from 'rollup-plugin-terser'
import typescript2 from 'rollup-plugin-typescript2'

import { dependencies } from './package.json'

const external = Object.keys(dependencies || '')
const globals = external.reduce((prev, current) => {
 const newPrev = prev

 newPrev[current] = current
 return newPrev
}, {})

const defaultConfig = {
 input: './src/index.ts',
 output: {
 file: './dist/index.js',
 format: 'cjs',
 banner: '#!/usr/bin/env node',
 globals
 },
 external,
 plugins: [
 typescript2({
  exclude: 'node_modules/**',
  useTsconfigDeclarationDir: true,
  typescript,
  tsconfig: './tsconfig.json'
 }),
 json(),
 terser()
 ]
}

export default defaultConfig

import { Command } from 'commander'
import pkg from '../package.json'

const program = new Command(pkg.name)

program
 .command('login')
 .description('模拟登录。')
 .action(() => {
  handleLogin()
 })

program.parse(process.argv)

const handleLogin = () => {
 // 配置交互的用户名和密码
 const prompt = [
 {
  type: 'input',
  name: 'userName',
  message: '用户名：',
  validate: (value: string) => value.length > 0 || '用户名不能为空'
 },
 {
  type: 'password',
  name: 'password',
  message: '密码：',
  mask: '"htmlcode">

program.on('--help', () => {
 console.log('\n运行 cli-demo -h | --help 查看命令使用。\n')
})


然后再来修改一下，没有输入任何参数的时候，会出现错误，可以使用 exitOverride 方法重新退出，在终端（命令行）输出帮助信息。


program.exitOverride()

try {
 program.parse(process.argv)
} catch (error) {
 program.outputHelp()
}


到这里，一个简单的 cli 工具完成了，先本地来测试下看看。在终端（命令行）输入 npm link，生成一个全局软连接，可以方便调试和测试。