@jil/args

A convention based argument parsing and formatting library, with strict validation checks. It is not a command line interface.

import {parse} from '@jil/args';

interface Options {
  help: boolean;
  logLevel: 'info' | 'error' | 'warn';
  version: boolean;
}

const {command, errors, options, params, rest} = parse<Options>(process.argv.slice(2), {
  commands: ['build', 'install', 'update'],
  options: {
    help: {
      default: false,
      description: 'Show a help menu',
      type: 'boolean',
      short: 'H',
    },
    logLevel: {
      choices: ['info', 'error', 'warn'],
      default: 'info',
      description: 'Customize logging level',
    },
    version: {
      default: false,
      description: 'Show the version number',
      type: 'boolean',
      short: 'V',
    },
  },
});

Features

• Commands and sub-commands: cmd, cmd:sub
• Options (long and short) that set a value(s): --foo value, --foo=value, -f value, -f=value
  • Camel (preferred) or kebab cased option names.
• Flags (boolean options) that take no value: --bar, -B
  • With implicit negation support: --no-bar
• Parameters that act as standalone values: foo bar baz
  • Can be marked as required.
• Rest arguments that are passed to subsequent scripts (aggregated after --): foo -- bar
• Supports string, number, boolean, and list based values, with the addition of:
  • Single value based on a list of possible choices.
  • Multiple values with optional arity count requirements.
• Group multiple short options under a single argument: -fBp
  • Increment a counter each time a short option is found in a group.
• Strict parser and validation checks, allowing for informative interfaces.
  • Custom option and param validation for increased accuracy.

Installation

npm i @jil/args

Documentation

• https://boostlib.dev/docs/args
• https://boostlib.dev/api/args