The compiler for writing next generation JavaScript.
## Intro
Babel is a tool that helps you write code in the latest version of JavaScript. When your supported environments don't support certain features natively, Babel will help you compile those features down to a supported version.
**In**
```js
// ES2020 nullish coalescing
function greet(input) {
return input ?? "Hello world";
}
```
**Out**
```js
function greet(input) {
return input != null ? input : "Hello world";
}
```
Try it out at our [REPL](https://babel.dev/repl#?browsers=defaults%2C%20not%20ie%2011&loose=true&code_lz=GYVwdgxgLglg9mABAcwE4FN1QBQzABxCgEpEBvAKEUQyhFST0KkQH5XEAiACXQBs-cRAHc4qPgBNOAbgoBfIA&shippedProposals=true&sourceType=script&lineWrap=true&presets=env%2Cenv&prettier=true).
## FAQ
### Who maintains Babel?
Mostly a handful of volunteers, funded by you! Please check out our [team page](https://babeljs.io/team)!
### Is there a Babel song?
I'm so glad you asked: [Hallelujah —— In Praise of Babel](SONG.md) by [@angus-c](https://github.com/angus-c), [audio version](https://youtu.be/40abpedBKK8) by [@swyx](https://twitter.com/@swyx). Tweet us your recordings!
### Looking for support?
For questions and support please join our [Slack Community](https://slack.babeljs.io/) (you can [sign up here](https://slack.babeljs.io/) for an invite), ask a question on [Stack Overflow](https://stackoverflow.com/questions/tagged/babeljs), or ping us on [Twitter](https://twitter.com/babeljs).
### Where are the docs?
Check out our website: [babeljs.io](https://babeljs.io/), and report issues/features at [babel/website](https://github.com/babel/website/issues).
### Want to report a bug or request a feature?
Please read through our [CONTRIBUTING.md](CONTRIBUTING.md) and fill out the issue template at [babel/issues](https://github.com/babel/babel/issues)!
### Want to contribute to Babel?
Check out:
- Our [#development](https://babeljs.slack.com/messages/development) Slack channel and say hi! ([sign-up](https://slack.babeljs.io))
- Issues with the [good first issue](https://github.com/babel/babel/labels/good%20first%20issue) and [help wanted](https://github.com/babel/babel/labels/help%20wanted) label. We suggest also looking at the [closed ones](https://github.com/babel/babel/issues?utf8=%E2%9C%93&q=is%3Aclosed+label%3A%22good+first+issue%22) to get a sense of the kinds of issues you can tackle.
Some resources:
- Our [CONTRIBUTING.md](CONTRIBUTING.md) to get started with setting up the repo.
- Our discussions/notes/roadmap: [babel/notes](https://github.com/babel/notes)
- Our progress on TC39 proposals: [babel/proposals](https://github.com/babel/proposals)
- Our blog which contains release posts and explanations: [/blog](https://babeljs.io/blog)
- Our videos page with talks about open source and Babel: [/videos](https://babeljs.io/videos)
- Our [podcast](https://podcast.babeljs.io)
### How is the repo structured?
The Babel repo is managed as a [monorepo](doc/design/monorepo.md) that is composed of many [npm packages](packages/README.md).
## License
[MIT](LICENSE)