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  "readme": "# yargs-parser\n\n[![Build Status](https://travis-ci.org/yargs/yargs-parser.png)](https://travis-ci.org/yargs/yargs-parser)\n[![Coverage Status](https://coveralls.io/repos/yargs/yargs-parser/badge.svg?branch=)](https://coveralls.io/r/yargs/yargs-parser?branch=master)\n[![NPM version](https://img.shields.io/npm/v/yargs-parser.svg)](https://www.npmjs.com/package/yargs-parser)\n[![Windows Tests](https://img.shields.io/appveyor/ci/bcoe/yargs-parser/master.svg?label=Windows%20Tests)](https://ci.appveyor.com/project/bcoe/yargs-parser)\n[![Standard Version](https://img.shields.io/badge/release-standard%20version-brightgreen.svg)](https://github.com/conventional-changelog/standard-version)\n\n\nThe mighty option parser used by [yargs](https://github.com/bcoe/yargs).\n\nvisit the [yargs website](http://yargs.js.org/) for more examples, and thorough usage instructions.\n\n<img width=\"250\" src=\"yargs-logo.png\">\n\n## Example\n\n```sh\nnpm i yargs-parser --save\n```\n\n```js\nvar argv = require('yargs-parser')(process.argv.slice(2));\nconsole.log(argv)\n```\n\n```sh\nnode example.js --foo=33 --bar hello\n{ _: [], foo: 33, bar: 'hello' }\n```\n\n_or parse a string!_\n\n```js\nvar argv = require('./')('--foo=99 --bar=33');\nconsole.log(argv)\n```\n\n```sh\n{ _: [], foo: 99, bar: 33 }\n```\n\n## API\n\n### require('yargs-parser')(args, opts={})\n\nParses command line arguments returning a simple mapping of keys and values.\n\n**expects:**\n\n* `args`: an array or string representing the options to parse.\n* `opts`: provide a set of hints indicating how `args` should be parsed:\n  * `opts.alias`: an object representing the set of aliases for a key: `{alias: {foo: ['f']}}`.\n  * `opts.array`: indicate that keys should be parsed as an array: `{array: ['foo', 'bar']}`.\n  * `opts.boolean`: arguments should be parsed as booleans: `{boolean: ['x', 'y']}`.\n  * `opts.config`: indicate a key that represents a path to a configuration file (this file will be loaded and parsed).\n  * `opts.count`: indicate a key that should be used as a counter, e.g., `-vvv` = `{v: 3}`.\n  * `opts.default`: provide default values for keys: `{default: {x: 33, y: 'hello world!'}}`.\n  * `opts.envPrefix`: environment variables (`process.env`) with the prefix provided should be parsed.\n  * `opts.narg`: specify that a key requires `n` arguments: `{narg: {x: 2}}`.\n  * `opts.normalize`: `path.normalize()` will be applied to values set to this key.\n  * `opts.string`: keys should be treated as strings (even if they resemble a number `-x 33`).\n  * `opts.configuration`: provide configuration options to the yargs-parser (see: [configuration](#configuration)).\n  * `opts.number`: keys should be treated as numbers.\n\n**returns:**\n\n* `obj`: an object representing the parsed value of `args`\n  * `key/value`: key value pairs for each argument and their aliases.\n  * `_`: an array representing the positional arguments.\n\n### require('yargs-parser').detailed(args, opts={})\n\nParses a command line string, returning detailed information required by the\nyargs engine.\n\n**expects:**\n\n* `args`: an array or string representing options to parse.\n* `opts`: provide a set of hints indicating how `args`, inputs are identical to `require('yargs-parser')(args, opts={})`.\n\n**returns:**\n\n* `argv`: an object representing the parsed value of `args`\n  * `key/value`: key value pairs for each argument and their aliases.\n  * `_`: an array representing the positional arguments.\n* `error`: populated with an error object if an exception occurred during parsing.\n* `aliases`: the inferred list of aliases built by combining lists in `opts.alias`.\n* `newAliases`: any new aliases added via camel-case expansion.\n* `configuration`: the configuration loaded from the `yargs` stanza in package.json.\n\n<a name=\"configuration\"></a>\n### Configuration\n\nThe yargs-parser applies several automated transformations on the keys provided\nin `args`. These features can be turned on and off using the `configuration` field\nof `opts`.\n\n```js\nvar parsed = parser(['--no-dice'], {\n  configuration: {\n    'boolean-negation': false\n  }\n})\n```\n\n### short option groups\n\n* default: `true`.\n* key: `short-option-groups`.\n\nShould a group of short-options be treated as boolean flags?\n\n```sh\nnode example.js -abc\n{ _: [], a: true, b: true, c: true }\n```\n\n_if disabled:_\n\n```sh\nnode example.js -abc\n{ _: [], abc: true }\n```\n\n### camel-case expansion\n\n* default: `true`.\n* key: `camel-case-expansion`.\n\nShould hyphenated arguments be expanded into camel-case aliases?\n\n```sh\nnode example.js --foo-bar\n{ _: [], 'foo-bar': true, fooBar: true }\n```\n\n_if disabled:_\n\n```sh\nnode example.js --foo-bar\n{ _: [], 'foo-bar': true }\n```\n\n### dot-notation\n\n* default: `true`\n* key: `dot-notation`\n\nShould keys that contain `.` be treated as objects?\n\n```sh\nnode example.js --foo.bar\n{ _: [], foo: { bar: true } }\n```\n\n_if disabled:_\n\n```sh\nnode example.js --foo.bar\n{ _: [], \"foo.bar\": true }\n```\n\n### parse numbers\n\n* default: `true`\n* key: 'parse-numbers'\n\nShould keys that look like numbers be treated as such?\n\n```sh\nnode example.js --foo=99.3\n{ _: [], foo: 99.3 }\n```\n\n_if disabled:_\n\n```sh\nnode example.js --foo=99.3\n{ _: [], foo: \"99.3\" }\n```\n\n### boolean negation\n\n* default: `true`\n* key: 'boolean-negation'\n\nShould variables prefixed with `--no` be treated as negations?\n\n```sh\nnode example.js --no-foo\n{ _: [], foo: false }\n```\n\n_if disabled:_\n\n```sh\nnode example.js --no-foo\n{ _: [], \"no-foo\": true }\n```\n\n## Special Thanks\n\nThe yargs project evolves from optimist and minimist. It owes its\nexistence to a lot of James Halliday's hard work. Thanks [substack](https://github.com/substack) **beep** **boop** \\o/\n\n## License\n\nISC\n",
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