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1# yargs-parser
2
3[![Build Status](https://travis-ci.org/yargs/yargs-parser.svg)](https://travis-ci.org/yargs/yargs-parser)
4[![Coverage Status](https://coveralls.io/repos/yargs/yargs-parser/badge.svg?branch=)](https://coveralls.io/r/yargs/yargs-parser?branch=master)
5[![NPM version](https://img.shields.io/npm/v/yargs-parser.svg)](https://www.npmjs.com/package/yargs-parser)
6[![Standard Version](https://img.shields.io/badge/release-standard%20version-brightgreen.svg)](https://github.com/conventional-changelog/standard-version)
7
8
9The mighty option parser used by [yargs](https://github.com/yargs/yargs).
10
11visit the [yargs website](http://yargs.js.org/) for more examples, and thorough usage instructions.
12
13<img width="250" src="https://raw.githubusercontent.com/yargs/yargs-parser/master/yargs-logo.png">
14
15## Example
16
17```sh
18npm i yargs-parser --save
19```
20
21```js
22var argv = require('yargs-parser')(process.argv.slice(2))
23console.log(argv)
24```
25
26```sh
27node example.js --foo=33 --bar hello
28{ _: [], foo: 33, bar: 'hello' }
29```
30
31_or parse a string!_
32
33```js
34var argv = require('./')('--foo=99 --bar=33')
35console.log(argv)
36```
37
38```sh
39{ _: [], foo: 99, bar: 33 }
40```
41
42Convert an array of mixed types before passing to `yargs-parser`:
43
44```js
45var parse = require('yargs-parser')
46parse(['-f', 11, '--zoom', 55].join(' ')) // <-- array to string
47parse(['-f', 11, '--zoom', 55].map(String)) // <-- array of strings
48```
49
50## API
51
52### require('yargs-parser')(args, opts={})
53
54Parses command line arguments returning a simple mapping of keys and values.
55
56**expects:**
57
58* `args`: a string or array of strings representing the options to parse.
59* `opts`: provide a set of hints indicating how `args` should be parsed:
60 * `opts.alias`: an object representing the set of aliases for a key: `{alias: {foo: ['f']}}`.
61 * `opts.array`: indicate that keys should be parsed as an array: `{array: ['foo', 'bar']}`.<br>
62 Indicate that keys should be parsed as an array and coerced to booleans / numbers:<br>
63 `{array: [{ key: 'foo', boolean: true }, {key: 'bar', number: true}]}`.
64 * `opts.boolean`: arguments should be parsed as booleans: `{boolean: ['x', 'y']}`.
65 * `opts.coerce`: provide a custom synchronous function that returns a coerced value from the argument provided
66 (or throws an error). For arrays the function is called only once for the entire array:<br>
67 `{coerce: {foo: function (arg) {return modifiedArg}}}`.
68 * `opts.config`: indicate a key that represents a path to a configuration file (this file will be loaded and parsed).
69 * `opts.configObjects`: configuration objects to parse, their properties will be set as arguments:<br>
70 `{configObjects: [{'x': 5, 'y': 33}, {'z': 44}]}`.
71 * `opts.configuration`: provide configuration options to the yargs-parser (see: [configuration](#configuration)).
72 * `opts.count`: indicate a key that should be used as a counter, e.g., `-vvv` = `{v: 3}`.
73 * `opts.default`: provide default values for keys: `{default: {x: 33, y: 'hello world!'}}`.
74 * `opts.envPrefix`: environment variables (`process.env`) with the prefix provided should be parsed.
75 * `opts.narg`: specify that a key requires `n` arguments: `{narg: {x: 2}}`.
76 * `opts.normalize`: `path.normalize()` will be applied to values set to this key.
77 * `opts.number`: keys should be treated as numbers.
78 * `opts.string`: keys should be treated as strings (even if they resemble a number `-x 33`).
79
80**returns:**
81
82* `obj`: an object representing the parsed value of `args`
83 * `key/value`: key value pairs for each argument and their aliases.
84 * `_`: an array representing the positional arguments.
85 * [optional] `--`: an array with arguments after the end-of-options flag `--`.
86
87### require('yargs-parser').detailed(args, opts={})
88
89Parses a command line string, returning detailed information required by the
90yargs engine.
91
92**expects:**
93
94* `args`: a string or array of strings representing options to parse.
95* `opts`: provide a set of hints indicating how `args`, inputs are identical to `require('yargs-parser')(args, opts={})`.
96
97**returns:**
98
99* `argv`: an object representing the parsed value of `args`
100 * `key/value`: key value pairs for each argument and their aliases.
101 * `_`: an array representing the positional arguments.
102* `error`: populated with an error object if an exception occurred during parsing.
103* `aliases`: the inferred list of aliases built by combining lists in `opts.alias`.
104* `newAliases`: any new aliases added via camel-case expansion.
105* `configuration`: the configuration loaded from the `yargs` stanza in package.json.
106
107<a name="configuration"></a>
108
109### Configuration
110
111The yargs-parser applies several automated transformations on the keys provided
112in `args`. These features can be turned on and off using the `configuration` field
113of `opts`.
114
115```js
116var parsed = parser(['--no-dice'], {
117 configuration: {
118 'boolean-negation': false
119 }
120})
121```
122
123### short option groups
124
125* default: `true`.
126* key: `short-option-groups`.
127
128Should a group of short-options be treated as boolean flags?
129
130```sh
131node example.js -abc
132{ _: [], a: true, b: true, c: true }
133```
134
135_if disabled:_
136
137```sh
138node example.js -abc
139{ _: [], abc: true }
140```
141
142### camel-case expansion
143
144* default: `true`.
145* key: `camel-case-expansion`.
146
147Should hyphenated arguments be expanded into camel-case aliases?
148
149```sh
150node example.js --foo-bar
151{ _: [], 'foo-bar': true, fooBar: true }
152```
153
154_if disabled:_
155
156```sh
157node example.js --foo-bar
158{ _: [], 'foo-bar': true }
159```
160
161### dot-notation
162
163* default: `true`
164* key: `dot-notation`
165
166Should keys that contain `.` be treated as objects?
167
168```sh
169node example.js --foo.bar
170{ _: [], foo: { bar: true } }
171```
172
173_if disabled:_
174
175```sh
176node example.js --foo.bar
177{ _: [], "foo.bar": true }
178```
179
180### parse numbers
181
182* default: `true`
183* key: `parse-numbers`
184
185Should keys that look like numbers be treated as such?
186
187```sh
188node example.js --foo=99.3
189{ _: [], foo: 99.3 }
190```
191
192_if disabled:_
193
194```sh
195node example.js --foo=99.3
196{ _: [], foo: "99.3" }
197```
198
199### boolean negation
200
201* default: `true`
202* key: `boolean-negation`
203
204Should variables prefixed with `--no` be treated as negations?
205
206```sh
207node example.js --no-foo
208{ _: [], foo: false }
209```
210
211_if disabled:_
212
213```sh
214node example.js --no-foo
215{ _: [], "no-foo": true }
216```
217
218### combine arrays
219
220* default: `false`
221* key: `combine-arrays`
222
223Should arrays be combined when provided by both command line arguments and
224a configuration file.
225
226### duplicate arguments array
227
228* default: `true`
229* key: `duplicate-arguments-array`
230
231Should arguments be coerced into an array when duplicated:
232
233```sh
234node example.js -x 1 -x 2
235{ _: [], x: [1, 2] }
236```
237
238_if disabled:_
239
240```sh
241node example.js -x 1 -x 2
242{ _: [], x: 2 }
243```
244
245### flatten duplicate arrays
246
247* default: `true`
248* key: `flatten-duplicate-arrays`
249
250Should array arguments be coerced into a single array when duplicated:
251
252```sh
253node example.js -x 1 2 -x 3 4
254{ _: [], x: [1, 2, 3, 4] }
255```
256
257_if disabled:_
258
259```sh
260node example.js -x 1 2 -x 3 4
261{ _: [], x: [[1, 2], [3, 4]] }
262```
263
264### negation prefix
265
266* default: `no-`
267* key: `negation-prefix`
268
269The prefix to use for negated boolean variables.
270
271```sh
272node example.js --no-foo
273{ _: [], foo: false }
274```
275
276_if set to `quux`:_
277
278```sh
279node example.js --quuxfoo
280{ _: [], foo: false }
281```
282
283### populate --
284
285* default: `false`.
286* key: `populate--`
287
288Should unparsed flags be stored in `--` or `_`.
289
290_If disabled:_
291
292```sh
293node example.js a -b -- x y
294{ _: [ 'a', 'x', 'y' ], b: true }
295```
296
297_If enabled:_
298
299```sh
300node example.js a -b -- x y
301{ _: [ 'a' ], '--': [ 'x', 'y' ], b: true }
302```
303
304### set placeholder key
305
306* default: `false`.
307* key: `set-placeholder-key`.
308
309Should a placeholder be added for keys not set via the corresponding CLI argument?
310
311_If disabled:_
312
313```sh
314node example.js -a 1 -c 2
315{ _: [], a: 1, c: 2 }
316```
317
318_If enabled:_
319
320```sh
321node example.js -a 1 -c 2
322{ _: [], a: 1, b: undefined, c: 2 }
323```
324
325### halt at non-option
326
327* default: `false`.
328* key: `halt-at-non-option`.
329
330Should parsing stop at the first positional argument? This is similar to how e.g. `ssh` parses its command line.
331
332_If disabled:_
333
334```sh
335node example.js -a run b -x y
336{ _: [ 'b' ], a: 'run', x: 'y' }
337```
338
339_If enabled:_
340
341```sh
342node example.js -a run b -x y
343{ _: [ 'b', '-x', 'y' ], a: 'run' }
344```
345
346### strip aliased
347
348* default: `false`
349* key: `strip-aliased`
350
351Should aliases be removed before returning results?
352
353_If disabled:_
354
355```sh
356node example.js --test-field 1
357{ _: [], 'test-field': 1, testField: 1, 'test-alias': 1, testAlias: 1 }
358```
359
360_If enabled:_
361
362```sh
363node example.js --test-field 1
364{ _: [], 'test-field': 1, testField: 1 }
365```
366
367### strip dashed
368
369* default: `false`
370* key: `strip-dashed`
371
372Should dashed keys be removed before returning results? This option has no effect if
373`camel-case-exansion` is disabled.
374
375_If disabled:_
376
377```sh
378node example.js --test-field 1
379{ _: [], 'test-field': 1, testField: 1 }
380```
381
382_If enabled:_
383
384```sh
385node example.js --test-field 1
386{ _: [], testField: 1 }
387```
388
389## Special Thanks
390
391The yargs project evolves from optimist and minimist. It owes its
392existence to a lot of James Halliday's hard work. Thanks [substack](https://github.com/substack) **beep** **boop** \o/
393
394## License
395
396ISC
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