npm i clii
yarn add clii

/**
 * A simple task
 * @param {Object} options
 * @param {number} options.num - Num variable
 * @param {("prod"|"dev"|"stage")} options.mode - Build mode
 */
export async function task(options) {
  console.log(options);
}

import clii from "clii";

clii(import.meta.url);

$ node index.mjs task1 -h
index.mjs task1 [options]

Options:
      --version  Show version number                                   [boolean]
  -f, --file     Specific clii file                                     [string]
  -w, --workdir  Specific working directory                             [string]
      --num      Num variable                                           [number]
      --mode     Build mode           [string] [choices: "prod", "dev", "stage"]
  -h, --help     Show help                                             [boolean]

$ node index.mjs task --num 3 --mode prod
{ num: 3, mode: 'prod' }

export const settings = {
  // Default port number
  port: 3000,
};

Options:
      --port     Default port number                    [number] [default: 3000]

Commands:
  demo.mjs cmd2 
   
     [options]  Another command

   

export function lint() {}
/**
 * Build
 * @param {Object} options
 * @param {boolean} options.prod
 */
export function build(options) {
  lint();
}

$ clii
Usage: clii 
   
     [options]

Commands:
  clii lint
  clii build [options]  Build

Options:
      --version  Show version number                                   [boolean]
  -f, --file     Specific clii file                                     [string]
  -w, --workdir  Specific working directory                             [string]
  -h, --help     Show help                                             [boolean]

$ clii build
$ clii lint