面对这个错误：TypeError: yargs.command is not a function

Question

I am trying to run the yargs.command command. I tried running this code snippet:

import yargs from "yargs";
yargs.command({
  command: "list",
  describe: "List all commands",
  handler: function () {
    console.log("Listing all commands.");
  },
});

yargs.command({
  command: "read",
  describe: "Reading all commands",
  handler: function () {
    console.log("Reading all commands");
  },
});

And I got this error in the output:

TypeError: yargs.command is not a function
    at file:///media/Main-Volume/courses/Udemy%20courses/Node%20JS%20bootcamp/notes-app/app.js:23:7
    at ModuleJob.run (internal/modules/esm/module_job.js:145:37)
    at async Loader.import (internal/modules/esm/loader.js:182:24)
    at async Object.loadESM (internal/process/esm_loader.js:68:5)

After searching on the internet, I came across this solution and added this statement in my code at the end: yargs.parse() . But unfortunately, I am still getting the same output.

My OS: MX-Linux 21.

Node: 12.22.5.

yargs: 17.4.1.

vs code: 1.66.2.

Does anyone have any clue what went wrong? Any help would be appreciated.

Answer 1

yargs is a function which returns the object with the .command property you want. From the README:

 yargs(hideBin(process.argv)).command('curl <url>', 'fetch the contents of the URL', () => {}, (argv) => { console.info(argv) }).demandCommand(1).parse()

Your code should look something like this:

import yargs from "yargs";
import {hideBin} from "yargs/helpers";

yargs(hideBin(process.argv))
    .command('list', 'List all commands', /*handler*/)
    .command(/*...*/)
    .parse();

Answer 2

This is wrong:

yargs.command({
  command:
})

The below is right:

yargs({
  command:
})