yargs-parser v21.1.1
yargs-parser
The mighty option parser used by yargs.
visit the yargs website for more examples, and thorough usage instructions.
Example
npm i yargs-parser --save
const 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!
const argv = require('yargs-parser')('--foo=99 --bar=33')
console.log(argv)
{ _: [], foo: 99, bar: 33 }
Convert an array of mixed types before passing to yargs-parser
:
const parse = require('yargs-parser')
parse(['-f', 11, '--zoom', 55].join(' ')) // <-- array to string
parse(['-f', 11, '--zoom', 55].map(String)) // <-- array of strings
Deno Example
As of v19
yargs-parser
supports Deno:
import parser from "https://deno.land/x/yargs_parser/deno.ts";
const argv = parser('--foo=99 --bar=9987930', {
string: ['bar']
})
console.log(argv)
ESM Example
As of v19
yargs-parser
supports ESM (both in Node.js and in the browser):
Node.js:
import parser from 'yargs-parser'
const argv = parser('--foo=99 --bar=9987930', {
string: ['bar']
})
console.log(argv)
Browsers:
<!doctype html>
<body>
<script type="module">
import parser from "https://unpkg.com/yargs-parser@19.0.0/browser.js";
const argv = parser('--foo=99 --bar=9987930', {
string: ['bar']
})
console.log(argv)
</script>
</body>
API
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 howargs
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']}
. Indicate that keys should be parsed as an array and coerced to booleans / numbers:{array: [{ key: 'foo', boolean: true }, {key: 'bar', number: true}]}
.opts.boolean
: arguments should be parsed as booleans:{boolean: ['x', 'y']}
.opts.coerce
: provide a custom synchronous function that returns a coerced value from the argument provided (or throws an error). For arrays the function is called only once for the entire array:{coerce: {foo: function (arg) {return modifiedArg}}}
.opts.config
: indicate a key that represents a path to a configuration file (this file will be loaded and parsed).opts.configObjects
: configuration objects to parse, their properties will be set as arguments:{configObjects: [{'x': 5, 'y': 33}, {'z': 44}]}
.opts.configuration
: provide configuration options to the yargs-parser (see: configuration).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 requiresn
arguments:{narg: {x: 2}}
.opts.normalize
:path.normalize()
will be applied to values set to this key.opts.number
: keys should be treated as numbers.opts.string
: keys should be treated as strings (even if they resemble a number-x 33
).
returns:
obj
: an object representing the parsed value ofargs
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 howargs
, inputs are identical torequire('yargs-parser')(args, opts={})
.
returns:
argv
: an object representing the parsed value ofargs
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--
.
error
: populated with an error object if an exception occurred during parsing.aliases
: the inferred list of aliases built by combining lists inopts.alias
.newAliases
: any new aliases added via camel-case expansion:boolean
:{ fooBar: true }
defaulted
: any new argument created byopts.default
, no aliases included.boolean
:{ foo: true }
configuration
: given by default settings andopts.configuration
.
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" }
parse positional numbers
- default:
true
- key:
parse-positional-numbers
Should positional keys that look like numbers be treated as such.
$ node example.js 99.3
{ _: [99.3] }
if disabled:
$ node example.js 99.3
{ _: ['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]] }
greedy arrays
- default:
true
- key:
greedy-arrays
Should arrays consume more than one positional argument following their flag.
$ node example --arr 1 2
{ _: [], arr: [1, 2] }
if disabled:
$ node example --arr 1 2
{ _: [2], arr: [1] }
Note: in v18.0.0
we are considering defaulting greedy arrays to false
.
nargs eats options
- default:
false
- key:
nargs-eats-options
Should nargs consume dash options as well as positional arguments.
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 }
halt at non-option
- default:
false
. - key:
halt-at-non-option
.
Should parsing stop at the first positional argument? This is similar to how e.g. ssh
parses its command line.
If disabled:
$ node example.js -a run b -x y
{ _: [ 'b' ], a: 'run', x: 'y' }
If enabled:
$ node example.js -a run b -x y
{ _: [ 'b', '-x', 'y' ], a: 'run' }
strip aliased
- default:
false
- key:
strip-aliased
Should aliases be removed before returning results?
If disabled:
$ node example.js --test-field 1
{ _: [], 'test-field': 1, testField: 1, 'test-alias': 1, testAlias: 1 }
If enabled:
$ node example.js --test-field 1
{ _: [], 'test-field': 1, testField: 1 }
strip dashed
- default:
false
- key:
strip-dashed
Should dashed keys be removed before returning results? This option has no effect if
camel-case-expansion
is disabled.
If disabled:
$ node example.js --test-field 1
{ _: [], 'test-field': 1, testField: 1 }
If enabled:
$ node example.js --test-field 1
{ _: [], testField: 1 }
unknown options as args
- default:
false
- key:
unknown-options-as-args
Should unknown options be treated like regular arguments? An unknown option is one that is not
configured in opts
.
If disabled
$ node example.js --unknown-option --known-option 2 --string-option --unknown-option2
{ _: [], unknownOption: true, knownOption: 2, stringOption: '', unknownOption2: true }
If enabled
$ node example.js --unknown-option --known-option 2 --string-option --unknown-option2
{ _: ['--unknown-option'], knownOption: 2, stringOption: '--unknown-option2' }
Supported Node.js Versions
Libraries in this ecosystem make a best effort to track Node.js' release schedule. Here's a post on why we think this is important.
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
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