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-# Contributing
-
-## Adding a new plugin to support (when approved in the next ECMAScript version)
-
-### Update [`plugin-features.js`](https://github.com/babel/babel/blob/master/packages/babel-preset-env/data/plugin-features.js)
-
-*Example:*
-
-If you were going to add `**` which is in ES2016:
-
-Find the relevant entries on [compat-table](https://kangax.github.io/compat-table/es2016plus/#test-exponentiation_(**)_operator):
-
-`exponentiation (**) operator`
-
-Find the corresponding babel plugin:
-
-`@babel/plugin-transform-exponentiation-operator`
-
-And add them in this structure:
-
-```js
-// es2016
-"@babel/plugin-transform-exponentiation-operator": {
-  features: [
-    "exponentiation (**) operator",
-  ],
-},
-```
-
-### Update [`built-in-features.js`](https://github.com/babel/babel/blob/master/packages/babel-preset-env/data/built-in-features.js)
-
-*Example:*
-
-In case you want to add `Object.values` which is in ES2017:
-
-Find the relevant feature and subfeature on [compat-table](https://kangax.github.io/compat-table/es2016plus/#test-Object_static_methods_Object.values)
-and split it with `/`:
-
-`Object static methods / Object.values`
-
-Find the corresponding module on [core-js](https://github.com/zloirock/core-js/tree/master/modules):
-
-`es7.object.values.js`
-
-Find required ES version in [`built-in-features.js`](https://github.com/babel/babel/blob/master/packages/babel-preset-env/data/built-in-features.js) and add the new feature:
-
-```js
-const es2017 = {
-  //...
-  "es7.object.values": "Object static methods / Object.values"
-}
-```
-
-### Update [`plugins.json`](https://github.com/babel/babel/blob/master/packages/babel-preset-env/data/plugins.json)
-
-Until `compat-table` is a standalone npm module for data we are using the git url
-
-`"compat-table": "kangax/compat-table#[latest-commit-hash]"`,
-
-So we update and then run `npm run build-data`. If there are no changes, then `plugins.json` will be the same.
-
-## Tests
-
-### Running tests locally
-
-```bash
-npm test
-```
-
-### Checking code coverage locally
-
-```bash
-npm run coverage
-```
-
-### Writing tests
-
-#### General
-
-All the tests for `@babel/preset-env` exist in the `test/fixtures` folder. The
-test setup and conventions are exactly the same as testing a Babel plugin, so
-please read our [documentation on writing tests](https://github.com/babel/babel/blob/master/CONTRIBUTING.md#babel-plugin-x).
-
-#### Testing the `debug` option
-
-Testing debug output to `stdout` is similar. Under the `test/debug-fixtures`,
-create a folder with a descriptive name of your test, and add the following:
-
-* Add a `options.json` file (just as the other tests, this is essentially a
-`.babelrc`) with the desired test configuration (required)
-* Add a `stdout.txt` file with the expected debug output. For added
-convenience, if there is no `stdout.txt` present, the test runner will
-generate one for you.