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+# Arg
+
+`arg` is yet another command line option parser.
+
+## Installation
+
+Use Yarn or NPM to install.
+
+```console
+$ yarn add arg
+```
+
+or
+
+```console
+$ npm install arg
+```
+
+## Usage
+
+`arg()` takes 1 or 2 arguments:
+
+1. An array of CLI arguments (_Optional_, defaults to `process.argv.slice(2)`)
+2. Options argument (see below)
+
+It returns an object with any values present on the command-line (missing options are thus
+missing from the resulting object). Arg performs no validation/requirement checking - we
+leave that up to the application.
+
+All parameters that aren't consumed by options (commonly referred to as "extra" parameters)
+are added to `result._`, which is _always_ an array (even if no extra parameters are passed,
+in which case an empty array is returned).
+
+```javascript
+const arg = require('arg');
+
+const args = arg([argument_array,] options);
+```
+
+For example:
+
+```console
+$ node ./hello.js --port=1234 -n 'My name' foo bar --tag qux --tag=qix -- --foobar
+```
+
+```javascript
+// hello.js
+const arg = require('arg');
+
+const args = arg({
+	// Types
+	'--help':    Boolean,
+	'--version': Boolean,
+	'--port':    Number,      // --port <number> or --port=<number>
+	'--name':    String,      // --name <string> or --name=<string>
+	'--tag':     [String],    // --tag <string> or --tag=<string>
+
+	// Aliases
+	'-v':        '--version',
+	'-n':        '--name',    // -n <string>; result is stored in --name
+	'--label':   '--name'     // --label <string> or --label=<string>;
+	                          //     result is stored in --name
+});
+
+console.log(args);
+/*
+{
+	_: ["foo", "bar", "--foobar"],
+	'--port': 1234,
+	'--name': "My name",
+	'--tag': ["qux", "qix"]
+}
+*/
+```
+
+The values for each key=&gt;value pair is either a type (function or [function]) or a string (indicating an alias).
+
+- In the case of a function, the string value of the argument's value is passed to it,
+  and the return value is used as the ultimate value.
+
+- In the case of an array, the only element _must_ be a type function. Array types indicate
+  that the argument may be passed multiple times, and as such the resulting value in the returned
+  object is an array with all of the values that were passed using the specified flag.
+
+- In the case of a string, an alias is established. If a flag is passed that matches the _key_,
+  then the _value_ is substituted in its place.
+
+Type functions are passed three arguments:
+
+1. The parameter value (always a string)
+2. The parameter name (e.g. `--label`)
+3. The previous value for the destination (useful for reduce-like operatons or for supporting `-v` multiple times, etc.)
+
+This means the built-in `String`, `Number`, and `Boolean` type constructors "just work" as type functions.
+
+# License
+
+Copyright &copy; 2017 by ZEIT, Inc. Released under the [MIT License](LICENSE.md).