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-# yargs-parser
-
-![ci](https://github.com/yargs/yargs-parser/workflows/ci/badge.svg)
-[![NPM version](https://img.shields.io/npm/v/yargs-parser.svg)](https://www.npmjs.com/package/yargs-parser)
-[![Conventional Commits](https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg)](https://conventionalcommits.org)
-![nycrc config on GitHub](https://img.shields.io/nycrc/yargs/yargs-parser)
-
-The mighty option parser used by [yargs](https://github.com/yargs/yargs).
-
-visit the [yargs website](http://yargs.js.org/) for more examples, and thorough usage instructions.
-
-<img width="250" src="https://raw.githubusercontent.com/yargs/yargs-parser/main/yargs-logo.png">
-
-## Example
-
-```sh
-npm i yargs-parser --save
-```
-
-```js
-const argv = require('yargs-parser')(process.argv.slice(2))
-console.log(argv)
-```
-
-```console
-$ node example.js --foo=33 --bar hello
-{ _: [], foo: 33, bar: 'hello' }
-```
-
-_or parse a string!_
-
-```js
-const argv = require('yargs-parser')('--foo=99 --bar=33')
-console.log(argv)
-```
-
-```console
-{ _: [], foo: 99, bar: 33 }
-```
-
-Convert an array of mixed types before passing to `yargs-parser`:
-
-```js
-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](https://github.com/denoland/deno):
-
-```typescript
-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:**
-
-```js
-import parser from 'yargs-parser'
-
-const argv = parser('--foo=99 --bar=9987930', {
- string: ['bar']
-})
-console.log(argv)
-```
-
-**Browsers:**
-
-```html
-<!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 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']}`.<br>
- Indicate that keys should be parsed as an array and coerced to booleans / numbers:<br>
- `{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:<br>
- `{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:<br>
- `{configObjects: [{'x': 5, 'y': 33}, {'z': 44}]}`.
- * `opts.configuration`: provide configuration options to the yargs-parser (see: [configuration](#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 requires `n` 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 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.
- * [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 in `opts.alias`.
-* `newAliases`: any new aliases added via camel-case expansion:
- * `boolean`: `{ fooBar: true }`
-* `defaulted`: any new argument created by `opts.default`, no aliases included.
- * `boolean`: `{ foo: true }`
-* `configuration`: given by default settings and `opts.configuration`.
-
-<a name="configuration"></a>
-
-### 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`.
-
-```js
-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?
-
-```console
-$ node example.js -abc
-{ _: [], a: true, b: true, c: true }
-```
-
-_if disabled:_
-
-```console
-$ node example.js -abc
-{ _: [], abc: true }
-```
-
-### camel-case expansion
-
-* default: `true`.
-* key: `camel-case-expansion`.
-
-Should hyphenated arguments be expanded into camel-case aliases?
-
-```console
-$ node example.js --foo-bar
-{ _: [], 'foo-bar': true, fooBar: true }
-```
-
-_if disabled:_
-
-```console
-$ node example.js --foo-bar
-{ _: [], 'foo-bar': true }
-```
-
-### dot-notation
-
-* default: `true`
-* key: `dot-notation`
-
-Should keys that contain `.` be treated as objects?
-
-```console
-$ node example.js --foo.bar
-{ _: [], foo: { bar: true } }
-```
-
-_if disabled:_
-
-```console
-$ 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?
-
-```console
-$ node example.js --foo=99.3
-{ _: [], foo: 99.3 }
-```
-
-_if disabled:_
-
-```console
-$ 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.
-
-```console
-$ node example.js 99.3
-{ _: [99.3] }
-```
-
-_if disabled:_
-
-```console
-$ node example.js 99.3
-{ _: ['99.3'] }
-```
-
-### boolean negation
-
-* default: `true`
-* key: `boolean-negation`
-
-Should variables prefixed with `--no` be treated as negations?
-
-```console
-$ node example.js --no-foo
-{ _: [], foo: false }
-```
-
-_if disabled:_
-
-```console
-$ 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:
-
-```console
-$ node example.js -x 1 -x 2
-{ _: [], x: [1, 2] }
-```
-
-_if disabled:_
-
-```console
-$ 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:
-
-```console
-$ node example.js -x 1 2 -x 3 4
-{ _: [], x: [1, 2, 3, 4] }
-```
-
-_if disabled:_
-
-```console
-$ 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.
-
-```console
-$ node example --arr 1 2
-{ _: [], arr: [1, 2] }
-```
-
-_if disabled:_
-
-```console
-$ 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.
-
-```console
-$ node example.js --no-foo
-{ _: [], foo: false }
-```
-
-_if set to `quux`:_
-
-```console
-$ node example.js --quuxfoo
-{ _: [], foo: false }
-```
-
-### populate --
-
-* default: `false`.
-* key: `populate--`
-
-Should unparsed flags be stored in `--` or `_`.
-
-_If disabled:_
-
-```console
-$ node example.js a -b -- x y
-{ _: [ 'a', 'x', 'y' ], b: true }
-```
-
-_If enabled:_
-
-```console
-$ 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:_
-
-```console
-$ node example.js -a 1 -c 2
-{ _: [], a: 1, c: 2 }
-```
-
-_If enabled:_
-
-```console
-$ 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:_
-
-```console
-$ node example.js -a run b -x y
-{ _: [ 'b' ], a: 'run', x: 'y' }
-```
-
-_If enabled:_
-
-```console
-$ 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:_
-
-```console
-$ node example.js --test-field 1
-{ _: [], 'test-field': 1, testField: 1, 'test-alias': 1, testAlias: 1 }
-```
-
-_If enabled:_
-
-```console
-$ 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:_
-
-```console
-$ node example.js --test-field 1
-{ _: [], 'test-field': 1, testField: 1 }
-```
-
-_If enabled:_
-
-```console
-$ 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_
-
-```console
-$ node example.js --unknown-option --known-option 2 --string-option --unknown-option2
-{ _: [], unknownOption: true, knownOption: 2, stringOption: '', unknownOption2: true }
-```
-
-_If enabled_
-
-```console
-$ 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](https://nodejs.org/en/about/releases/). Here's [a
-post on why we think this is important](https://medium.com/the-node-js-collection/maintainers-should-consider-following-node-js-release-schedule-ab08ed4de71a).
-
-## 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](https://github.com/substack) **beep** **boop** \o/
-
-## License
-
-ISC