Working with Command-Line Arguments

const args = process.argv.slice(2);
const opts = {};
for (let i = 0; i < args.length; i++) {
  if (args[i].startsWith("--")) opts[args[i].slice(2)] = args[i+1];
}

import { parseArgs } from "node:util";
const { values, positionals } = parseArgs({
  options: {
    port: { type: "string", short: "p", default: "3000" },
    verbose: { type: "boolean", short: "v" }
  },
  allowPositionals: true
});

import { Command } from "commander";
const program = new Command();
program
  .name("mycli")
  .option("-p, --port <number>", "port", "3000")
  .command("serve").action(() => startServer())
  .parse();

program
  .command("user <action>")
  .description("manage users")
  .action((action) => { /* ... */ });