mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-24 09:25:15 +00:00
89 lines
1.4 KiB
Markdown
89 lines
1.4 KiB
Markdown
# babel-plugin-transform-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-transform-object-rest-spread
|
|
```
|
|
|
|
## Usage
|
|
|
|
### Via `.babelrc` (Recommended)
|
|
|
|
**.babelrc**
|
|
|
|
```json
|
|
{
|
|
"plugins": ["transform-object-rest-spread"]
|
|
}
|
|
```
|
|
|
|
### Via CLI
|
|
|
|
```sh
|
|
babel --plugins transform-object-rest-spread script.js
|
|
```
|
|
|
|
### Via Node API
|
|
|
|
```javascript
|
|
require("babel-core").transform("code", {
|
|
plugins: ["transform-object-rest-spread"]
|
|
});
|
|
```
|
|
|
|
## Options
|
|
|
|
### `useBuiltIns`
|
|
|
|
`boolean`, defaults to `false`.
|
|
|
|
By default, this plugin uses Babel's `extends` helper which polyfills `Object.assign`. Enabling this option will use `Object.assign` directly.
|
|
|
|
**.babelrc**
|
|
|
|
```json
|
|
{
|
|
"plugins": [
|
|
["transform-object-rest-spread", { "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)
|