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## Contributing
### Adding a new plugin to support (when approved in the next ECMAScript version)
#### Update [`pluginFeatures.js`](/data/plugin-features.js)
Example:
In you were going to add `**` which is in ES2016:
Find the relevant entries on [compat-table](kangax.github.io/compat-table/):
`exponentiation (**) operator`
Find the corresponding babel plugin:
`transform-exponentiation-operator`
Add add them in this structure:
```js
// es2016
"transform-exponentiation-operator": {
features: [
"exponentiation (**) operator",
],
},
```
#### Update [`plugins.json`](/data/plugins.json)
Until `compat-table` is a standalone npm module for data we are using the git url
`"compat-table": "github:kangax/compat-table#gh-pages",`
So we update and then run `npm run build-data`. If there are no changes, then `plugins.json` will be the same.