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authorruki <waruqi@gmail.com>2018-11-08 00:43:05 +0800
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-# @babel/plugin-proposal-object-rest-spread
-
-> This plugin allows Babel to transform rest properties for object destructuring assignment and spread properties for object literals.
-
-## Example
-
-### Rest Properties
-
-```js
-let { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 };
-console.log(x); // 1
-console.log(y); // 2
-console.log(z); // { a: 3, b: 4 }
-```
-
-### Spread Properties
-
-```js
-let n = { x, y, ...z };
-console.log(n); // { x: 1, y: 2, a: 3, b: 4 }
-```
-
-## Installation
-
-```sh
-npm install --save-dev @babel/plugin-proposal-object-rest-spread
-```
-
-## Usage
-
-### Via `.babelrc` (Recommended)
-
-**.babelrc**
-
-```json
-{
- "plugins": ["@babel/plugin-proposal-object-rest-spread"]
-}
-```
-
-### Via CLI
-
-```sh
-babel --plugins @babel/plugin-proposal-object-rest-spread script.js
-```
-
-### Via Node API
-
-```javascript
-require("@babel/core").transform("code", {
- plugins: ["@babel/plugin-proposal-object-rest-spread"]
-});
-```
-
-## Options
-
-By default, this plugin will produce spec compliant code by using Babel's `objectSpread` helper.
-
-### `loose`
-
-`boolean`, defaults to `false`.
-
-Enabling this option will use Babel's `extends` helper, which is basically the same as `Object.assign` (see `useBuiltIns` below to use it directly).
-
-:warning: Please keep in mind that even if they're almost equivalent, there's an important difference between spread and `Object.assign`: **spread _defines_ new properties, while `Object.assign()` _sets_ them**, so using this mode might produce unexpected results in some cases.
-
-For detailed information please check out [Spread VS. Object.assign](http://2ality.com/2016/10/rest-spread-properties.html#spreading-objects-versus-objectassign) and [Assigning VS. defining properties](http://exploringjs.com/es6/ch_oop-besides-classes.html#sec_assigning-vs-defining-properties).
-
-
-### `useBuiltIns`
-
-`boolean`, defaults to `false`.
-
-Enabling this option will use `Object.assign` directly instead of the Babel's `extends` helper.
-
-##### Example
-
-**.babelrc**
-
-```json
-{
- "plugins": [
- ["@babel/plugin-proposal-object-rest-spread", { "loose": true, "useBuiltIns": true }]
- ]
-}
-```
-
-**In**
-
-```js
-z = { x, ...y };
-```
-
-**Out**
-
-```js
-z = Object.assign({ x }, y);
-```
-
-## References
-
-* [Proposal: Object Rest/Spread Properties for ECMAScript](https://github.com/sebmarkbage/ecmascript-rest-spread)
-* [Spec](http://sebmarkbage.github.io/ecmascript-rest-spread)
-* [Spread VS. Object.assign](http://2ality.com/2016/10/rest-spread-properties.html#spreading-objects-versus-objectassign)
-* [Assigning VS. defining properties](http://exploringjs.com/es6/ch_oop-besides-classes.html#sec_assigning-vs-defining-properties)