help.mjs

#!/usr/bin/env node
import yargs from 'yargs';

const argv = yargs(process.argv.slice(2))
  .usage('This is my awesome program\n\nUsage: $0 [options]')
  .help('help')
  .alias('help', 'h')
  .version('version', '1.0.1')
  .alias('version', 'V')
  .options({
    input: {
      alias: 'i',
      description: '<filename> Input file name',
      requiresArg: true,
      required: true,
    },
    output: {
      alias: 'o',
      description: '<filename> output file name',
      requiresArg: true,
      required: true,
    },
  })
  .parse();

console.log('Inspecting options');
console.dir(argv);

console.log('input:', argv.input);
console.log('output:', argv.output);