我得到的yargs.methodName并不是所有yargs方法的函数在没有Babel的情况下在NodeJS中使用ES6导入

Question

所以，我正在做一个nodejs教程，但是教程没有更新到ES6，我只是想在学习的过程中更新代码。我使用require('yargs')让程序运行得很好，但是不断得到yargs.command、yargs.argv等不是一个函数。据我所知，nodejs现在支持import/export语句，yargs也是如此。我已经将我的应用程序设置为"type: module“并另存为.mjs文件。下面列出了具有终端输出的工作和非工作(ES6)。如果有人能发现我的错误，请让我知道…

工作代码..。

// ipmort module libraries from node package manager
const yargs = require('yargs')
const notes = require('./notes.js')

// Output colors
const chalk = require('chalk')
let jenkinsColor = '#bd93f9'
let successColor = '#50fa7b'
let failureColor = '#ff5555'

// Yargs stored version number
yargs.version('1.0.0')

// --- ADD COMMAND ----
yargs.command({
  command: 'add',
  describe: 'Have Jenkins add a new note',
  builder: {
    title: {
      describe: 'Note title',
      demandOption: true,
      type: 'string'
    },
    body: {
      describe: 'Note content',
      demandOption: true,
      type: 'string'
    }
  },
  handler(argv) {
    notes.addNote(argv.title, argv.body)
  }
})

// --- REMOVE COMMAND ----
yargs.command({
  command: 'remove',
  describe: 'Have Jenkins remove an existing note',
  builder: {
    title: {
      describe: 'Note to be deleted',
      demandOption: true,
      type: 'string'
    }
  },
  handler(argv) {
    notes.removeNote(argv.title)
  } 
})

// --- READ COMMAND ----
yargs.command({
  command: 'read',
  describe: 'Have Jenkins read your notes',
  handler() {
    console.log('Reading your notes, sir...')
  }
})

// --- LIST COMMAND ----
yargs.command({
  command: 'list',
  describe: 'Have Jenkins list your notes',
  handler() {
   console.log('Removing your note, sir...')
  }
})

yargs.parse()

终端..。

node-notes-app$ node app.js add --title="Test Title" --body="testing testing 123"

      ...............................
      + Test Title
      ...............................
      + + testing testing 123
    
SUCCESS
Adding your new note to your list, sir...
christopher@rra-debian-desktop:~/Documents/IBM/FED/NodeJS/node-notes-app$ 

ES6

// import module libraries from node package manager
import yargs from 'yargs'
// import notes from './notes.js'

// Yargs stored version number
yargs.version('1.0.0')

// --- ADD COMMAND ----
yargs.command({
  command: 'add',
  describe: 'Have Jenkins add a new note',
  builder: {
    title: {
      describe: 'Note title',
      demandOption: true,
      type: 'string'
    },
    body: {
      describe: 'Note content',
      demandOption: true,
      type: 'string'
    }
  },
  handler(argv) {
    notes.addNote(argv.title, argv.body)
  }
})

// --- REMOVE COMMAND ----
yargs.command({
  command: 'remove',
  describe: 'Have Jenkins remove an existing note',
  builder: {
    title: {
      describe: 'Note to be deleted',
      demandOption: true,
      type: 'string'
    }
  },
  handler(argv) {
    notes.removeNote(argv.title)
  } 
})

// --- READ COMMAND ----
yargs.command({
  command: 'read',
  describe: 'Have Jenkins read your notes',
  handler() {
    console.log('Reading your notes, sir...')
  }
})

// --- LIST COMMAND ----
yargs.command({
  command: 'list',
  describe: 'Have Jenkins list your notes',
  handler() {
   console.log('Removing your note, sir...')
  }
})

yargs.parse()

终点站...

app.mjs:12
yargs.version('1.0.0')
      ^

TypeError: yargs.version is not a function
    at file:///home/christopher/Documents/IBM/FED/NodeJS/node-notes-app/app.mjs:12:7
    at ModuleJob.run (internal/modules/esm/module_job.js:152:23)
    at async Loader.import (internal/modules/esm/loader.js:166:24)
    at async Object.loadESM (internal/process/esm_loader.js:68:5)

Answer 1

我在github...here is the solution (https://github.com/yargs/yargs/issues/1854)上发布了这期文章。

这在Advanced Topics README.file (https://github.com/yargs/yargs/blob/master/docs/advanced.md)中有解释

使用index.mjs的

命令层次结构示例

为了支持在使用ESM时创建复杂的嵌套CLI，扩展了方法.command()以接受命令模块数组。不使用.commandDir()，而是使用命令列表在每个命令目录中创建一个index.mjs：

cmds/index.mjs：

import * as a from './init.mjs'; import * as b from './remote.mjs';
export const commands = [a, b];

然后将导入此索引并将其注册到您的命令行界面：

cli.js：

#!/usr/bin/env节点

import yargs from 'yargs'; import { hideBin } from 'yargs/helpers';
import { commands } from './cmds/index.mjs';
 
yargs(hideBin(process.argv))
  .command(commands)
  .argv;

下面是我重新格式化的工作代码app.mjs的一部分

// import module libraries from node package manager
import yargs from 'yargs'
import { hideBin } from 'yargs/helpers'
import notes from './notes.mjs'

const yarg = yargs(hideBin(process.argv))

// Yargs stored version number
yarg.version('1.0.0')

// --- ADD COMMAND ----
yarg.command({
  command: 'add',
  describe: 'Have Jenkins add a new note',
  builder: {
    title: {
      describe: 'Note title',
      demandOption: true,
      type: 'string'
    },
    body: {
      describe: 'Note content',
      demandOption: true,
      type: 'string'
    }
  },
  handler(argv) {
    notes.addNote(argv.title, argv.body)
  }
})

终端输出..。

~/Projects/IBM/BED/NodeJS/node-notes-app$ node app.mjs --help
app.mjs [command]

Commands:
  app.mjs add     Have Jenkins add a new note
  app.mjs remove  Have Jenkins remove an existing note
  app.mjs read    Have Jenkins read your notes
  app.mjs list    Have Jenkins list your notes

Options:
  --help     Show help                                                 [boolean]
  --version  Show version number                                       [boolean]