🚩 funwithflags

parse argument options

This module is minimist refactored as a fluent class ~125% faster.

📘 examples

var argv = require('funwithflags')(process.argv.slice(2));
console.log(argv);

📦 install

yarn add funwithflags --dev
npm install funwithflags --save-dev

⚙ options

Name	Type	Description	?Default	Example
string	string | Array<string>	names to always treat as strings	null
boolean	boolean | string | Array<string>	always treat as booleans. if true will treat all double hyphenated arguments without equal signs. (e.g. affects --foo, not -f or --foo=bar)	null
alias	Object	an object mapping string names to strings or arrays of string names to use as aliases	{}
default	Object	an object mapping string argument names to default values	{}
['--']	boolean	populate argv._ with everything before the -- and argv['--'] with everything after the --	null
stopEarly	boolean	when true, populate argv._ with everything after the first non-option	null
unknown	Function	a function which is invoked with a command line parameter not defined in the opts configuration object. If the function returns false, the unknown option is not added to argv	null
obj	boolean	when true, returns the object instance of FunWithFlags	null
vars	boolean	when true, allows args without dashes to be used as flags	null
camel	boolean	when true, camelCases object keys on argv	null
underscore	boolean	when false, object is returned with no _ (for looping over object keys or values or the like)	null

extending the class

🔬 tests

• tests use ava

🏋️ benchmarks

• benchmarks use benchmark.js with bench-chain

verbose

var unknown = []

// captures the unknown args, similar to how `vars` does
function unknownFn(arg) {
  unknown.push(arg)
  return true
}

var opts = {
  'default': {
    'moose.box': 11,
    'eh': true,
    'igloo': false,
  },
  'alias': {
    'moose.box': 'mooses.boxes',
    'rain': 'british-columbia',
  },
  'boolean': ['eh', 'igloo'],
  'string': ['country', 'nan', 'noflag'],
  'vars': true,
  '--': true,
  'obj': true, // will return the instance
  'unknown': unknownFn,
}

var args = [
  '--country=canada',

  // aliased to `rain` so it will have `rain: true, 'british-columbia': true`
  '--british-columbia',

  // no value is default a true boolean
  '--igloo',

  // dot notation
  '--a.b=100',

  // using `string: 'nan'` we ensure this stays as a string
  '--nan',
  '99',

  // first flag is boolean (t: true)
  // second flag assigned to following value (f: 555)
  '-tf',
  '555',

  // mooses and globbing are parsed only because `vars: true``
  'mooses.boxes=moozes',
  'globbing',
  `"**/*"`,

  // after double dash
  '--',
  'dis-little-piggy',
  'went-to-market',
]

var obj = require('../')(args, opts)
const argv = obj.argv