CLI Frameworks: Build Professional Command-Line Tools

# Without framework
const args = process.argv.slice(2);
// Manual parsing, validation, help text

# With framework
program
  .command('deploy <env>')
  .option('-v, --verbose', 'verbose output')
  .action(deploy);

import { Command } from 'commander';

const program = new Command();

program
  .name('my-cli')
  .description('My awesome CLI')
  .version('1.0.0');

program
  .command('deploy <env>')
  .description('Deploy to environment')
  .option('-v, --verbose', 'verbose output')
  .action((env, options) => {
    console.log(`Deploying to ${env}`);
    if (options.verbose) console.log('Verbose mode');
  });

program.parse();

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

yargs(hideBin(process.argv))
  .command('deploy <env>', 'Deploy to environment', (yargs) => {
    return yargs.option('verbose', {
      alias: 'v',
      type: 'boolean',
      description: 'Verbose output'
    });
  }, (argv) => {
    console.log(`Deploying to ${argv.env}`);
  })
  .parse();

import { Command, Flags } from '@oclif/core';

export default class DeployCommand extends Command {
  static description = 'Deploy to environment';

  static flags = {
    verbose: Flags.boolean({ char: 'v' })
  };

  static args = [{
    name: 'env',
    required: true,
    description: 'Environment to deploy'
  }];

  async run() {
    const { args, flags } = await this.parse(DeployCommand);
    console.log(`Deploying to ${args.env}`);
  }
}

import React from 'react';
import { render, Text } from 'ink';

const App = () => (
  <Text color="green">Hello CLI!</Text>
);

render(<App />);