Largs NPM | npm.io

largs

Light weight args, command line parser

Simple cli arguments configuration and parsing with minimal dependencies.

The API has a similar feel to Yargs but largs has a limited feature set.

Requires Node 10+

Install

npm install largs --save

yarn add largs

Usage

Create an .option - ./script --option value -s short

or .positional - ./script one two

or a sub .command that supports all the same largs setup - ./command run --option value

and then .run() to process and return the options in a simple object

Options

Shortcut Options config setup

//import Largs from 'largs'
const { Largs } = require('largs')

const args = Largs.run({
  first: { short: 'f', required: true },
  second: { short: 's', long: 'two', type: 'integer', default: 1 },
  command_bork: {
    onlyhere: { type: String },
  }
})
console.log(args.bork.onlyhere) // => 'chef'

For functional setup

//import largs from 'largs'
const { largs } = require('largs')

largs.option('firstthing')
    .short('f')
    .required()

largs.option('otherthing')
    .short('s')
    .long('two')
    .type('integer')
    .default(1)

largs.command('bork')
    .option('onlyforbork')
        .type('string)

largs.positional('one')
    .type('enum', ['this'])
    .required()

const args = largs.run() // returns object representation of opts. `opts.largs`

console.log(args) // => { firstthing: "val", otherthing: "val", bork: { onlyforbork: 'yep' }, positional: [ 'one' ] }

→ node app.js --two 22222 this
Error: Missing required arguments
 "--firstthing/-f" is required

→ node app.js -f one --two 22222
Error: 1 argument is required

→ node app.js -f one --two 22222 asdf
Error: Arg "1" was "asdf" but must be one of: this"

→ node app.js -f one --two 22222 this
{ options: { first: 'one', second: 22222 },
  positional: [ 'this' ],
  config:
   { firstthing:
      { name: 'firstthing',
        short: 'f',
        long: 'firstthing',
        description: undefined,
        help: undefined,
        group: '' },
     otherthing:
      { name: 'otherthing',
        short: 's',
        long: 'two',
        description: undefined,
        help: undefined,
        group: '' } } }