| [6a3a178] | 1 | # yargs-parser
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| 2 |
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| 3 | 
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| 4 | [](https://www.npmjs.com/package/yargs-parser)
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| 5 | [](https://conventionalcommits.org)
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| 6 | 
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| 7 |
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| 8 | The mighty option parser used by [yargs](https://github.com/yargs/yargs).
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| 9 |
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| 10 | visit the [yargs website](http://yargs.js.org/) for more examples, and thorough usage instructions.
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| 11 |
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| 12 | <img width="250" src="https://raw.githubusercontent.com/yargs/yargs-parser/main/yargs-logo.png">
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| 13 |
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| 14 | ## Example
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| 15 |
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| 16 | ```sh
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| 17 | npm i yargs-parser --save
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| 18 | ```
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| 19 |
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| 20 | ```js
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| 21 | const argv = require('yargs-parser')(process.argv.slice(2))
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| 22 | console.log(argv)
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| 23 | ```
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| 24 |
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| 25 | ```console
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| 26 | $ node example.js --foo=33 --bar hello
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| 27 | { _: [], foo: 33, bar: 'hello' }
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| 28 | ```
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| 29 |
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| 30 | _or parse a string!_
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| 31 |
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| 32 | ```js
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| 33 | const argv = require('yargs-parser')('--foo=99 --bar=33')
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| 34 | console.log(argv)
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| 35 | ```
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| 36 |
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| 37 | ```console
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| 38 | { _: [], foo: 99, bar: 33 }
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| 39 | ```
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| 40 |
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| 41 | Convert an array of mixed types before passing to `yargs-parser`:
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| 42 |
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| 43 | ```js
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| 44 | const parse = require('yargs-parser')
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| 45 | parse(['-f', 11, '--zoom', 55].join(' ')) // <-- array to string
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| 46 | parse(['-f', 11, '--zoom', 55].map(String)) // <-- array of strings
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| 47 | ```
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| 48 |
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| 49 | ## Deno Example
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| 50 |
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| 51 | As of `v19` `yargs-parser` supports [Deno](https://github.com/denoland/deno):
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| 52 |
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| 53 | ```typescript
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| 54 | import parser from "https://deno.land/x/yargs_parser/deno.ts";
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| 55 |
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| 56 | const argv = parser('--foo=99 --bar=9987930', {
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| 57 | string: ['bar']
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| 58 | })
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| 59 | console.log(argv)
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| 60 | ```
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| 61 |
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| 62 | ## ESM Example
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| 63 |
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| 64 | As of `v19` `yargs-parser` supports ESM (_both in Node.js and in the browser_):
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| 65 |
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| 66 | **Node.js:**
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| 67 |
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| 68 | ```js
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| 69 | import parser from 'yargs-parser'
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| 70 |
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| 71 | const argv = parser('--foo=99 --bar=9987930', {
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| 72 | string: ['bar']
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| 73 | })
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| 74 | console.log(argv)
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| 75 | ```
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| 76 |
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| 77 | **Browsers:**
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| 78 |
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| 79 | ```html
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| 80 | <!doctype html>
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| 81 | <body>
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| 82 | <script type="module">
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| 83 | import parser from "https://unpkg.com/yargs-parser@19.0.0/browser.js";
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| 84 |
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| 85 | const argv = parser('--foo=99 --bar=9987930', {
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| 86 | string: ['bar']
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| 87 | })
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| 88 | console.log(argv)
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| 89 | </script>
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| 90 | </body>
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| 91 | ```
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| 92 |
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| 93 | ## API
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| 94 |
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| 95 | ### parser(args, opts={})
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| 96 |
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| 97 | Parses command line arguments returning a simple mapping of keys and values.
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| 98 |
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| 99 | **expects:**
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| 100 |
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| 101 | * `args`: a string or array of strings representing the options to parse.
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| 102 | * `opts`: provide a set of hints indicating how `args` should be parsed:
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| 103 | * `opts.alias`: an object representing the set of aliases for a key: `{alias: {foo: ['f']}}`.
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| 104 | * `opts.array`: indicate that keys should be parsed as an array: `{array: ['foo', 'bar']}`.<br>
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| 105 | Indicate that keys should be parsed as an array and coerced to booleans / numbers:<br>
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| 106 | `{array: [{ key: 'foo', boolean: true }, {key: 'bar', number: true}]}`.
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| 107 | * `opts.boolean`: arguments should be parsed as booleans: `{boolean: ['x', 'y']}`.
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| 108 | * `opts.coerce`: provide a custom synchronous function that returns a coerced value from the argument provided
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| 109 | (or throws an error). For arrays the function is called only once for the entire array:<br>
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| 110 | `{coerce: {foo: function (arg) {return modifiedArg}}}`.
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| 111 | * `opts.config`: indicate a key that represents a path to a configuration file (this file will be loaded and parsed).
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| 112 | * `opts.configObjects`: configuration objects to parse, their properties will be set as arguments:<br>
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| 113 | `{configObjects: [{'x': 5, 'y': 33}, {'z': 44}]}`.
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| 114 | * `opts.configuration`: provide configuration options to the yargs-parser (see: [configuration](#configuration)).
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| 115 | * `opts.count`: indicate a key that should be used as a counter, e.g., `-vvv` = `{v: 3}`.
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| 116 | * `opts.default`: provide default values for keys: `{default: {x: 33, y: 'hello world!'}}`.
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| 117 | * `opts.envPrefix`: environment variables (`process.env`) with the prefix provided should be parsed.
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| 118 | * `opts.narg`: specify that a key requires `n` arguments: `{narg: {x: 2}}`.
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| 119 | * `opts.normalize`: `path.normalize()` will be applied to values set to this key.
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| 120 | * `opts.number`: keys should be treated as numbers.
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| 121 | * `opts.string`: keys should be treated as strings (even if they resemble a number `-x 33`).
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| 122 |
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| 123 | **returns:**
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| 124 |
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| 125 | * `obj`: an object representing the parsed value of `args`
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| 126 | * `key/value`: key value pairs for each argument and their aliases.
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| 127 | * `_`: an array representing the positional arguments.
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| 128 | * [optional] `--`: an array with arguments after the end-of-options flag `--`.
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| 129 |
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| 130 | ### require('yargs-parser').detailed(args, opts={})
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| 131 |
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| 132 | Parses a command line string, returning detailed information required by the
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| 133 | yargs engine.
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| 134 |
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| 135 | **expects:**
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| 136 |
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| 137 | * `args`: a string or array of strings representing options to parse.
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| 138 | * `opts`: provide a set of hints indicating how `args`, inputs are identical to `require('yargs-parser')(args, opts={})`.
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| 139 |
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| 140 | **returns:**
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| 141 |
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| 142 | * `argv`: an object representing the parsed value of `args`
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| 143 | * `key/value`: key value pairs for each argument and their aliases.
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| 144 | * `_`: an array representing the positional arguments.
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| 145 | * [optional] `--`: an array with arguments after the end-of-options flag `--`.
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| 146 | * `error`: populated with an error object if an exception occurred during parsing.
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| 147 | * `aliases`: the inferred list of aliases built by combining lists in `opts.alias`.
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| 148 | * `newAliases`: any new aliases added via camel-case expansion:
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| 149 | * `boolean`: `{ fooBar: true }`
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| 150 | * `defaulted`: any new argument created by `opts.default`, no aliases included.
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| 151 | * `boolean`: `{ foo: true }`
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| 152 | * `configuration`: given by default settings and `opts.configuration`.
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| 153 |
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| 154 | <a name="configuration"></a>
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| 155 |
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| 156 | ### Configuration
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| 157 |
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| 158 | The yargs-parser applies several automated transformations on the keys provided
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| 159 | in `args`. These features can be turned on and off using the `configuration` field
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| 160 | of `opts`.
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| 161 |
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| 162 | ```js
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| 163 | var parsed = parser(['--no-dice'], {
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| 164 | configuration: {
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| 165 | 'boolean-negation': false
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| 166 | }
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| 167 | })
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| 168 | ```
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| 169 |
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| 170 | ### short option groups
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| 171 |
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| 172 | * default: `true`.
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| 173 | * key: `short-option-groups`.
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| 174 |
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| 175 | Should a group of short-options be treated as boolean flags?
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| 176 |
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| 177 | ```console
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| 178 | $ node example.js -abc
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| 179 | { _: [], a: true, b: true, c: true }
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| 180 | ```
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| 181 |
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| 182 | _if disabled:_
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| 183 |
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| 184 | ```console
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| 185 | $ node example.js -abc
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| 186 | { _: [], abc: true }
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| 187 | ```
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| 188 |
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| 189 | ### camel-case expansion
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| 190 |
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| 191 | * default: `true`.
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| 192 | * key: `camel-case-expansion`.
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| 193 |
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| 194 | Should hyphenated arguments be expanded into camel-case aliases?
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| 195 |
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| 196 | ```console
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| 197 | $ node example.js --foo-bar
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| 198 | { _: [], 'foo-bar': true, fooBar: true }
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| 199 | ```
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| 200 |
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| 201 | _if disabled:_
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| 202 |
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| 203 | ```console
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| 204 | $ node example.js --foo-bar
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| 205 | { _: [], 'foo-bar': true }
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| 206 | ```
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| 207 |
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| 208 | ### dot-notation
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| 209 |
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| 210 | * default: `true`
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| 211 | * key: `dot-notation`
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| 212 |
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| 213 | Should keys that contain `.` be treated as objects?
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| 214 |
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| 215 | ```console
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| 216 | $ node example.js --foo.bar
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| 217 | { _: [], foo: { bar: true } }
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| 218 | ```
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| 219 |
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| 220 | _if disabled:_
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| 221 |
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| 222 | ```console
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| 223 | $ node example.js --foo.bar
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| 224 | { _: [], "foo.bar": true }
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| 225 | ```
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| 226 |
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| 227 | ### parse numbers
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| 228 |
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| 229 | * default: `true`
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| 230 | * key: `parse-numbers`
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| 231 |
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| 232 | Should keys that look like numbers be treated as such?
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| 233 |
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| 234 | ```console
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| 235 | $ node example.js --foo=99.3
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| 236 | { _: [], foo: 99.3 }
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| 237 | ```
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| 238 |
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| 239 | _if disabled:_
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| 240 |
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| 241 | ```console
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| 242 | $ node example.js --foo=99.3
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| 243 | { _: [], foo: "99.3" }
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| 244 | ```
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| 245 |
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| 246 | ### parse positional numbers
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| 247 |
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| 248 | * default: `true`
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| 249 | * key: `parse-positional-numbers`
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| 250 |
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| 251 | Should positional keys that look like numbers be treated as such.
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| 252 |
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| 253 | ```console
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| 254 | $ node example.js 99.3
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| 255 | { _: [99.3] }
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| 256 | ```
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| 257 |
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| 258 | _if disabled:_
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| 259 |
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| 260 | ```console
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| 261 | $ node example.js 99.3
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| 262 | { _: ['99.3'] }
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| 263 | ```
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| 264 |
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| 265 | ### boolean negation
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| 266 |
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| 267 | * default: `true`
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| 268 | * key: `boolean-negation`
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| 269 |
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| 270 | Should variables prefixed with `--no` be treated as negations?
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| 271 |
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| 272 | ```console
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| 273 | $ node example.js --no-foo
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| 274 | { _: [], foo: false }
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| 275 | ```
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| 276 |
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| 277 | _if disabled:_
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| 278 |
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| 279 | ```console
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| 280 | $ node example.js --no-foo
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| 281 | { _: [], "no-foo": true }
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| 282 | ```
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| 283 |
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| 284 | ### combine arrays
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| 285 |
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| 286 | * default: `false`
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| 287 | * key: `combine-arrays`
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| 288 |
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| 289 | Should arrays be combined when provided by both command line arguments and
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| 290 | a configuration file.
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| 291 |
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| 292 | ### duplicate arguments array
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| 293 |
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| 294 | * default: `true`
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| 295 | * key: `duplicate-arguments-array`
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| 296 |
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| 297 | Should arguments be coerced into an array when duplicated:
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| 298 |
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| 299 | ```console
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| 300 | $ node example.js -x 1 -x 2
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| 301 | { _: [], x: [1, 2] }
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| 302 | ```
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| 303 |
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| 304 | _if disabled:_
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| 305 |
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| 306 | ```console
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| 307 | $ node example.js -x 1 -x 2
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| 308 | { _: [], x: 2 }
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| 309 | ```
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| 310 |
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| 311 | ### flatten duplicate arrays
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| 312 |
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| 313 | * default: `true`
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| 314 | * key: `flatten-duplicate-arrays`
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| 315 |
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| 316 | Should array arguments be coerced into a single array when duplicated:
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| 317 |
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| 318 | ```console
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| 319 | $ node example.js -x 1 2 -x 3 4
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| 320 | { _: [], x: [1, 2, 3, 4] }
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| 321 | ```
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| 322 |
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| 323 | _if disabled:_
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| 324 |
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| 325 | ```console
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| 326 | $ node example.js -x 1 2 -x 3 4
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| 327 | { _: [], x: [[1, 2], [3, 4]] }
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| 328 | ```
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| 329 |
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| 330 | ### greedy arrays
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| 331 |
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| 332 | * default: `true`
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| 333 | * key: `greedy-arrays`
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| 334 |
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| 335 | Should arrays consume more than one positional argument following their flag.
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| 336 |
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| 337 | ```console
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| 338 | $ node example --arr 1 2
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| 339 | { _: [], arr: [1, 2] }
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| 340 | ```
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| 341 |
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| 342 | _if disabled:_
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| 343 |
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| 344 | ```console
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| 345 | $ node example --arr 1 2
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| 346 | { _: [2], arr: [1] }
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| 347 | ```
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| 348 |
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| 349 | **Note: in `v18.0.0` we are considering defaulting greedy arrays to `false`.**
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| 350 |
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| 351 | ### nargs eats options
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| 352 |
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| 353 | * default: `false`
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| 354 | * key: `nargs-eats-options`
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| 355 |
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| 356 | Should nargs consume dash options as well as positional arguments.
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| 357 |
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| 358 | ### negation prefix
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| 359 |
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| 360 | * default: `no-`
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| 361 | * key: `negation-prefix`
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| 362 |
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| 363 | The prefix to use for negated boolean variables.
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| 364 |
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| 365 | ```console
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| 366 | $ node example.js --no-foo
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| 367 | { _: [], foo: false }
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| 368 | ```
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| 369 |
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| 370 | _if set to `quux`:_
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| 371 |
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| 372 | ```console
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| 373 | $ node example.js --quuxfoo
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| 374 | { _: [], foo: false }
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| 375 | ```
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| 376 |
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| 377 | ### populate --
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| 378 |
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| 379 | * default: `false`.
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| 380 | * key: `populate--`
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| 381 |
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| 382 | Should unparsed flags be stored in `--` or `_`.
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| 383 |
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| 384 | _If disabled:_
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| 385 |
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| 386 | ```console
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| 387 | $ node example.js a -b -- x y
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| 388 | { _: [ 'a', 'x', 'y' ], b: true }
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| 389 | ```
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| 390 |
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| 391 | _If enabled:_
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| 392 |
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| 393 | ```console
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| 394 | $ node example.js a -b -- x y
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| 395 | { _: [ 'a' ], '--': [ 'x', 'y' ], b: true }
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| 396 | ```
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| 397 |
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| 398 | ### set placeholder key
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| 399 |
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| 400 | * default: `false`.
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| 401 | * key: `set-placeholder-key`.
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| 402 |
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| 403 | Should a placeholder be added for keys not set via the corresponding CLI argument?
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| 404 |
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| 405 | _If disabled:_
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| 406 |
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| 407 | ```console
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| 408 | $ node example.js -a 1 -c 2
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| 409 | { _: [], a: 1, c: 2 }
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| 410 | ```
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| 411 |
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| 412 | _If enabled:_
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| 413 |
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| 414 | ```console
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| 415 | $ node example.js -a 1 -c 2
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| 416 | { _: [], a: 1, b: undefined, c: 2 }
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| 417 | ```
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| 418 |
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| 419 | ### halt at non-option
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| 420 |
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| 421 | * default: `false`.
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| 422 | * key: `halt-at-non-option`.
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| 423 |
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| 424 | Should parsing stop at the first positional argument? This is similar to how e.g. `ssh` parses its command line.
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| 425 |
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| 426 | _If disabled:_
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| 427 |
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| 428 | ```console
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| 429 | $ node example.js -a run b -x y
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| 430 | { _: [ 'b' ], a: 'run', x: 'y' }
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| 431 | ```
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| 432 |
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| 433 | _If enabled:_
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| 434 |
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| 435 | ```console
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| 436 | $ node example.js -a run b -x y
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| 437 | { _: [ 'b', '-x', 'y' ], a: 'run' }
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| 438 | ```
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| 439 |
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| 440 | ### strip aliased
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| 441 |
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| 442 | * default: `false`
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| 443 | * key: `strip-aliased`
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| 444 |
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| 445 | Should aliases be removed before returning results?
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| 446 |
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| 447 | _If disabled:_
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| 448 |
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| 449 | ```console
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| 450 | $ node example.js --test-field 1
|
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| 451 | { _: [], 'test-field': 1, testField: 1, 'test-alias': 1, testAlias: 1 }
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| 452 | ```
|
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| 453 |
|
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| 454 | _If enabled:_
|
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| 455 |
|
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| 456 | ```console
|
|---|
| 457 | $ node example.js --test-field 1
|
|---|
| 458 | { _: [], 'test-field': 1, testField: 1 }
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| 459 | ```
|
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| 460 |
|
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| 461 | ### strip dashed
|
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| 462 |
|
|---|
| 463 | * default: `false`
|
|---|
| 464 | * key: `strip-dashed`
|
|---|
| 465 |
|
|---|
| 466 | Should dashed keys be removed before returning results? This option has no effect if
|
|---|
| 467 | `camel-case-expansion` is disabled.
|
|---|
| 468 |
|
|---|
| 469 | _If disabled:_
|
|---|
| 470 |
|
|---|
| 471 | ```console
|
|---|
| 472 | $ node example.js --test-field 1
|
|---|
| 473 | { _: [], 'test-field': 1, testField: 1 }
|
|---|
| 474 | ```
|
|---|
| 475 |
|
|---|
| 476 | _If enabled:_
|
|---|
| 477 |
|
|---|
| 478 | ```console
|
|---|
| 479 | $ node example.js --test-field 1
|
|---|
| 480 | { _: [], testField: 1 }
|
|---|
| 481 | ```
|
|---|
| 482 |
|
|---|
| 483 | ### unknown options as args
|
|---|
| 484 |
|
|---|
| 485 | * default: `false`
|
|---|
| 486 | * key: `unknown-options-as-args`
|
|---|
| 487 |
|
|---|
| 488 | Should unknown options be treated like regular arguments? An unknown option is one that is not
|
|---|
| 489 | configured in `opts`.
|
|---|
| 490 |
|
|---|
| 491 | _If disabled_
|
|---|
| 492 |
|
|---|
| 493 | ```console
|
|---|
| 494 | $ node example.js --unknown-option --known-option 2 --string-option --unknown-option2
|
|---|
| 495 | { _: [], unknownOption: true, knownOption: 2, stringOption: '', unknownOption2: true }
|
|---|
| 496 | ```
|
|---|
| 497 |
|
|---|
| 498 | _If enabled_
|
|---|
| 499 |
|
|---|
| 500 | ```console
|
|---|
| 501 | $ node example.js --unknown-option --known-option 2 --string-option --unknown-option2
|
|---|
| 502 | { _: ['--unknown-option'], knownOption: 2, stringOption: '--unknown-option2' }
|
|---|
| 503 | ```
|
|---|
| 504 |
|
|---|
| 505 | ## Supported Node.js Versions
|
|---|
| 506 |
|
|---|
| 507 | Libraries in this ecosystem make a best effort to track
|
|---|
| 508 | [Node.js' release schedule](https://nodejs.org/en/about/releases/). Here's [a
|
|---|
| 509 | post on why we think this is important](https://medium.com/the-node-js-collection/maintainers-should-consider-following-node-js-release-schedule-ab08ed4de71a).
|
|---|
| 510 |
|
|---|
| 511 | ## Special Thanks
|
|---|
| 512 |
|
|---|
| 513 | The yargs project evolves from optimist and minimist. It owes its
|
|---|
| 514 | existence to a lot of James Halliday's hard work. Thanks [substack](https://github.com/substack) **beep** **boop** \o/
|
|---|
| 515 |
|
|---|
| 516 | ## License
|
|---|
| 517 |
|
|---|
| 518 | ISC
|
|---|
