40e43f5a14
* Add test case demonstrating invalid behavior * Add conditional check for child properties so RHS is not duplicated * Add recursive check to find any nested non single-property case * Add case for array destructuring * Add test case for a nested rest element * More safely recurse through array destructuring * Traverse assignment and nested rest operations * Refactor to be more clear which case statement we are executing against * Update missed snapshots * Update packages/babel-plugin-proposal-object-rest-spread/src/index.js Co-authored-by: Huáng Jùnliàng <jlhwung@gmail.com> * Filter null array elements, add early return, remove optional chaining * Use stronger type assertions * Update fall through to be false; add early return to RestElement case * Move hasMoreThanOneBinding to its own file with distinct tests * Rename testing helper to more appropriately match business logic * Yarn Dedup & rename hasMoreThanOneBinding to shouldStoreRHSInTemporaryVariable Co-authored-by: Huáng Jùnliàng <jlhwung@gmail.com>
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 on Open Collective or GitHub (which goes to our Open Collective account)!
Sponsors
Our top sponsors are shown below! [Become a sponsor]
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
// ES2020 nullish coalescing
function greet(input) {
return input ?? "Hello world";
}
Out
function greet(input) {
return input != null ? input : "Hello world";
}
Try it out at our REPL.
FAQ
Who maintains Babel?
Mostly a handful of volunteers, funded by you! Please check out our team page!
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!
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.
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 #development Slack channel and say hi! (sign-up)
- 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.
Some resources:
- Our CONTRIBUTING.md to get started with setting up the repo.
- Our discussions/notes/roadmap: babel/notes
- Our progress on TC39 proposals: babel/proposals
- Our blog which contains release posts and explanations: /blog
- Our videos page with talks about open source and Babel: /videos
- Our podcast
How is the repo structured?
The Babel repo is managed as a monorepo that is composed of many npm packages.