a7391144b3
* Introduce scope tracking * Fix tests * Add new tests * Remove constructor-super check from transform as it is now in parser * Correctly handle class properties and class scope * Fix duplicate name check * Convert scope identifier storage to array * Enter a new scope in typescript module blocks * Add test for duplicate declaration * Rename error for duplicate exports * Treat class declarations as lexical declaration * Update whitelist * Add tests * Fix scope tracking for function declarations * Migrate try-catch duplicate error * Fix test * More tests * One more test * Make scope a separate class and fix review comments * Do not allow new.target in top scope arrow function * Correctly enter new scope for declare module and treat type aliases as lexical declarations * Tests for typescript scope tracking to not mark type aliases as duplicate * Fix flow scope tracking * Remove ident from test names as redundant * Add test case for var and function * Improve error messages * Improve literal regex
The compiler for writing next generation JavaScript.
Supporting Babel
Babel (pronounced "babble") is a community-driven project used by many companies and projects, and is maintained by a group of volunteers. If you'd like to help support the future of the project, please consider:
- Giving developer time on the project. (Message us on Twitter or Slack for guidance!)
- Giving funds by becoming a sponsor (see below)!
Open Collective Sponsors
Become a sponsor and get your logo on our README on Github with a link to your site. [Become a sponsor]
Patreon Sponsors
Become a sponsor and get your logo on our README on Github with a link to your site. [Become a sponsor]
Bronze
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
// ES2015 arrow function
[1, 2, 3].map((n) => n + 1);
Out
[1, 2, 3].map(function(n) {
return n + 1;
});
Try it out at our REPL.
FAQ
Who maintains Babel?
Mostly a handful of volunteers, funded by you! Please check out our team page!
Looking for support?
For questions and support please join our Slack Community (you can sign-up here for an invite), ask a question on Stack Overflow, or ping us on Twitter.
Is there a Babel song?
I'm so glad you asked: Hallelujah —— In Praise of Babel by @angus-c, audio version by @swyx. Tweet us your recordings!
Where are the docs?
Check out our website: babeljs.io, and report issues/features at babel/website.
Want to report a bug or request a feature?
Please read through our CONTRIBUTING.md and fill out the issue template at babel/issues!
Want to contribute to Babel?
Check out our CONTRIBUTING.md to get started with setting up the repo.
- If you have already joined Slack, join our #development channel and say hi!
- Check out the issues with the good first issue and help wanted label. We suggest also looking at the closed ones to get a sense of the kinds of issues you can tackle.
- Our discussions/notes/roadmap: babel/notes
- Our progress on TC39 proposals: babel/proposals
How is the repo structured?
The Babel repo is managed as a monorepo that is composed of many npm packages.