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# babel-plugin-transform-es2015-duplicate-keys
> Compile objects with duplicate keys to valid strict ES5.
This plugin actually converts duplicate keys in objects to be computed properties, which then must be handled by the [transform-es2015-computed-properties](http://babeljs.io/docs/plugins/transform-es2015-computed-properties) plugin. The final result won't contain any object literals with duplicate keys.
## Example
**In**
```javascript
var x = { a: 5, a: 6 };
var y = {
get a() {},
set a(x) {},
a: 3
};
```
**Out**
```javascript
var x = { a: 5, ["a"]: 6 };
var y = {
get a() {},
set a(x) {},
["a"]: 3
};
```
## Installation
```sh
npm install --save-dev babel-plugin-transform-es2015-duplicate-keys
```
## Usage
### Via `.babelrc` (Recommended)
**.babelrc**
```json
{
"plugins": ["transform-es2015-duplicate-keys"]
}
```
### Via CLI
```sh
babel --plugins transform-es2015-duplicate-keys script.js
```
### Via Node API
```javascript
require("babel-core").transform("code", {
plugins: ["transform-es2015-duplicate-keys"]
});
```