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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 }

API

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

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

expects:

  • args: an array or string 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.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.

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.

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

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

expects:

  • args: an array or string 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 }

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