60 lines
1.1 KiB
Markdown
60 lines
1.1 KiB
Markdown
# @babel/plugin-transform-reserved-words
|
|
|
|
> Renames variables that are reserved words in ES3 but not ES5+
|
|
|
|
Some words were reserved in ES3 as potential future keywords but were not
|
|
reserved in ES5 and later. This plugin, to be used when targeting ES3
|
|
environments, renames variables from that set of words.
|
|
|
|
## Example
|
|
|
|
**In**
|
|
|
|
```javascript
|
|
var abstract = 1;
|
|
var x = abstract + 1;
|
|
```
|
|
|
|
**Out**
|
|
|
|
```javascript
|
|
var _abstract = 1;
|
|
var x = _abstract + 1;
|
|
```
|
|
|
|
## Installation
|
|
|
|
```sh
|
|
npm install --save-dev @babel/plugin-transform-reserved-words
|
|
```
|
|
|
|
## Usage
|
|
|
|
### Via `.babelrc` (Recommended)
|
|
|
|
**.babelrc**
|
|
|
|
```json
|
|
{
|
|
"plugins": ["@babel/plugin-transform-reserved-words"]
|
|
}
|
|
```
|
|
|
|
### Via CLI
|
|
|
|
```sh
|
|
babel --plugins @babel/plugin-transform-reserved-words script.js
|
|
```
|
|
|
|
### Via Node API
|
|
|
|
```javascript
|
|
require("@babel/core").transform("code", {
|
|
plugins: ["@babel/plugin-transform-reserved-words"]
|
|
});
|
|
```
|
|
|
|
## References
|
|
|
|
* [ES3 Spec: Future Reserved Words](http://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262,%203rd%20edition,%20December%201999.pdf#page=26)
|