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-# @babel/plugin-transform-parameters
-
-> Compile ES2015 default and rest parameters to ES5
-
-This plugin transforms ES2015 parameters to ES5, this includes:
-
-- Destructuring parameters
-- Default parameters
-- Rest parameters
-
-## Examples
-
-**In**
-
-```javascript
-function test(x = "hello", { a, b }, ...args) {
- console.log(x, a, b, args);
-}
-```
-
-**Out**
-
-```javascript
-function test() {
- var x = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : "hello";
- var _ref = arguments[1];
- var a = _ref.a,
- b = _ref.b;
-
- for (var _len = arguments.length, args = Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {
- args[_key - 2] = arguments[_key];
- }
-
- console.log(x, a, b, args);
-}
-```
-
-## Installation
-
-```sh
-npm install --save-dev @babel/plugin-transform-parameters
-```
-
-## Caveats
-
-Default parameters desugar into `let` declarations to retain proper semantics. If this is
-not supported in your environment then you'll need the
-[@babel/plugin-transform-block-scoping](http://babeljs.io/docs/plugins/transform-block-scoping) plugin.
-
-## Usage
-
-### Via `.babelrc` (Recommended)
-
-**.babelrc**
-
-```json
-{
- "plugins": ["@babel/plugin-transform-parameters"]
-}
-```
-
-### Via CLI
-
-```sh
-babel --plugins @babel/plugin-transform-parameters script.js
-```
-
-### Via Node API
-
-```javascript
-require("@babel/core").transform("code", {
- plugins: ["@babel/plugin-transform-parameters"]
-});
-```
-
-## Options
-
-### `loose`
-
-`boolean`, defaults to `false`.
-
-In loose mode, parameters with default values will be counted into the arity of the function. This is not spec behavior where these parameters do not add to function arity.
-
-The `loose` implementation is a more performant solution as JavaScript engines will fully optimize a function that doesn't reference `arguments`. Please do your own benchmarking and determine if this option is the right fit for your application.
-
-```javascript
-// Spec behavior
-function bar1 (arg1 = 1) {}
-bar1.length // 0
-
-// Loose mode
-function bar1 (arg1 = 1) {}
-bar1.length // 1
-```