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README.md

yargs-parser

Build Status Coverage Status NPM version Windows Tests Standard Version

The mighty option parser used by yargs.

visit the yargs website for more examples, and thorough usage instructions.

Example

npm i yargs-parser --save
var argv = require('yargs-parser')(process.argv.slice(2))
console.log(argv)
node example.js --foo=33 --bar hello
{ _: [], foo: 33, bar: 'hello' }

or parse a string!

var argv = require('./')('--foo=99 --bar=33')
console.log(argv)
{ _: [], foo: 99, bar: 33 }

Convert an array of mixed types before passing to yargs-parser:

var parse = require('yargs-parser')
parse(['-f', 11, '--zoom', 55].join(' '))   // <-- array to string
parse(['-f', 11, '--zoom', 55].map(String)) // <-- array of strings

API

require('yargs-parser')(args, opts={})

Parses command line arguments returning a simple mapping of keys and values.

expects:

  • args: a string or array of strings representing the options to parse.
  • opts: provide a set of hints indicating how args should be parsed:
    • opts.alias: an object representing the set of aliases for a key: {alias: {foo: ['f']}}.
    • opts.array: indicate that keys should be parsed as an array: {array: ['foo', 'bar']}.
    • opts.boolean: arguments should be parsed as booleans: {boolean: ['x', 'y']}.
    • opts.config: indicate a key that represents a path to a configuration file (this file will be loaded and parsed).
    • opts.coerce: provide a custom synchronous function that returns a coerced value from the argument provided (or throws an error), e.g. {coerce: {foo: function (arg) {return modifiedArg}}}.
    • opts.count: indicate a key that should be used as a counter, e.g., -vvv = {v: 3}.
    • opts.default: provide default values for keys: {default: {x: 33, y: 'hello world!'}}.
    • opts.envPrefix: environment variables (process.env) with the prefix provided should be parsed.
    • opts.narg: specify that a key requires n arguments: {narg: {x: 2}}.
    • opts.normalize: path.normalize() will be applied to values set to this key.
    • opts.string: keys should be treated as strings (even if they resemble a number -x 33).
    • opts.configuration: provide configuration options to the yargs-parser (see: configuration).
    • opts.number: keys should be treated as numbers.
    • opts['--']: arguments after the end-of-options flag -- will be set to the argv.['--'] array instead of being set to the argv._ array.

returns:

  • obj: an object representing the parsed value of args
    • key/value: key value pairs for each argument and their aliases.
    • _: an array representing the positional arguments.
    • [optional] --: an array with arguments after the end-of-options flag --.

require('yargs-parser').detailed(args, opts={})

Parses a command line string, returning detailed information required by the yargs engine.

expects:

  • args: a string or array of strings representing options to parse.
  • opts: provide a set of hints indicating how args, inputs are identical to require('yargs-parser')(args, opts={}).

returns:

  • argv: an object representing the parsed value of args
    • key/value: key value pairs for each argument and their aliases.
    • _: an array representing the positional arguments.
  • error: populated with an error object if an exception occurred during parsing.
  • aliases: the inferred list of aliases built by combining lists in opts.alias.
  • newAliases: any new aliases added via camel-case expansion.
  • configuration: the configuration loaded from the yargs stanza in package.json.

Configuration

The yargs-parser applies several automated transformations on the keys provided in args. These features can be turned on and off using the configuration field of opts.

var parsed = parser(['--no-dice'], {
configuration: {
'boolean-negation': false
}
})

short option groups

  • default: true.
  • key: short-option-groups.

Should a group of short-options be treated as boolean flags?

node example.js -abc
{ _: [], a: true, b: true, c: true }

if disabled:

node example.js -abc
{ _: [], abc: true }

camel-case expansion

  • default: true.
  • key: camel-case-expansion.

Should hyphenated arguments be expanded into camel-case aliases?

node example.js --foo-bar
{ _: [], 'foo-bar': true, fooBar: true }

if disabled:

node example.js --foo-bar
{ _: [], 'foo-bar': true }

dot-notation

  • default: true
  • key: dot-notation

Should keys that contain . be treated as objects?

node example.js --foo.bar
{ _: [], foo: { bar: true } }

if disabled:

node example.js --foo.bar
{ _: [], "foo.bar": true }

parse numbers

  • default: true
  • key: parse-numbers

Should keys that look like numbers be treated as such?

node example.js --foo=99.3
{ _: [], foo: 99.3 }

if disabled:

node example.js --foo=99.3
{ _: [], foo: "99.3" }

boolean negation

  • default: true
  • key: boolean-negation

Should variables prefixed with --no be treated as negations?

node example.js --no-foo
{ _: [], foo: false }

if disabled:

node example.js --no-foo
{ _: [], "no-foo": true }

combine arrays

  • default: false
  • key: combine-arrays

Should arrays be combined when provided by both command line arguments and a configuration file.

duplicate arguments array

  • default: true
  • key: duplicate-arguments-array

Should arguments be coerced into an array when duplicated:

node example.js -x 1 -x 2
{ _: [], x: [1, 2] }

if disabled:

node example.js -x 1 -x 2
{ _: [], x: 2 }

flatten duplicate arrays

  • default: true
  • key: flatten-duplicate-arrays

Should array arguments be coerced into a single array when duplicated:

node example.js -x 1 2 -x 3 4
{ _: [], x: [1, 2, 3, 4] }

if disabled:

node example.js -x 1 2 -x 3 4
{ _: [], x: [[1, 2], [3, 4]] }

negation prefix

  • default: no-
  • key: negation-prefix

The prefix to use for negated boolean variables.

node example.js --no-foo
{ _: [], foo: false }

if set to quux:

node example.js --quuxfoo
{ _: [], foo: false }

populate --

  • default: false.
  • key: populate--

Should unparsed flags be stored in -- or _.

If disabled:

node example.js a -b -- x y
{ _: [ 'a', 'x', 'y' ], b: true }

If enabled:

node example.js a -b -- x y
{ _: [ 'a' ], '--': [ 'x', 'y' ], b: true }

set placeholder key

  • default: false.
  • key: set-placeholder-key.

Should a placeholder be added for keys not set via the corresponding CLI argument?

If disabled:

node example.js -a 1 -c 2
{ _: [], a: 1, c: 2 }

If enabled:

node example.js -a 1 -c 2
{ _: [], a: 1, b: undefined, c: 2 }

Special Thanks

The yargs project evolves from optimist and minimist. It owes its existence to a lot of James Halliday's hard work. Thanks substack beep boop \o/

License

ISC