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yargs.js	3.4.3	2020-03-31 08:42:07 -04:00

README.md

Yargs

Yargs be a node.js library fer hearties tryin' ter parse optstrings

Description :

Yargs helps you build interactive command line tools, by parsing arguments and generating an elegant user interface.

It gives you:

commands and (grouped) options (my-program.js serve --port=5000).
a dynamically generated help menu based on your arguments.

bash-completion shortcuts for commands and options.
and tons more.

Installation

Stable version:

npm i yargs

Bleeding edge version with the most recent features:

npm i yargs@next

Usage :

Simple Example

#!/usr/bin/env node
const argv = require('yargs').argv

if (argv.ships > 3 && argv.distance < 53.5) {
  console.log('Plunder more riffiwobbles!')
} else {
  console.log('Retreat from the xupptumblers!')
}

$ ./plunder.js --ships=4 --distance=22
Plunder more riffiwobbles!

$ ./plunder.js --ships 12 --distance 98.7
Retreat from the xupptumblers!

Complex Example

#!/usr/bin/env node
require('yargs') // eslint-disable-line
  .command('serve [port]', 'start the server', (yargs) => {
    yargs
      .positional('port', {
        describe: 'port to bind on',
        default: 5000
      })
  }, (argv) => {
    if (argv.verbose) console.info(`start server on :${argv.port}`)
    serve(argv.port)
  })
  .option('verbose', {
    alias: 'v',
    type: 'boolean',
    description: 'Run with verbose logging'
  })
  .argv

Run the example above with --help to see the help for the application.

TypeScript

yargs has type definitions at @types/yargs.

npm i @types/yargs --save-dev

See usage examples in docs.

Webpack

See usage examples of yargs with webpack in docs.

Community :

Having problems? want to contribute? join our community slack.