87feda7c2a
* Add error recovery support to @babel/parser * Update @babel/parser tests to always recover from errors * Update this.raise usage in @babel/parser: - expression.js - lval.js - statement.js - estree.js - flow.js - jsx/index.js - tokenizer/index.js * Update @babel/parser fixtures with recovered errors * Fix tests out of @babel/parser * Do not use try/catch for control flow * Update invalid fixtures * Do not report invalid lhs in toAssignable * Do not validate function id multiple times * Dedupe reserved await errors * Remove duplicate errors about strict reserved bindings * Remove duplicated error about yield/await inside params * Don't error twice for methods in object patterns * Don't report invalid super() twice * Remove dup error about reserved param for expr arrows * Remove double escapes in migrated tests * Dedupe errors about invalid escapes in identifiers * Remove duplicated error about decorated constructor * Remove duplicated error about spread in flow class * Don't throw for invalid super usage * Don't fail for object decorators with stage 2 * Fix flow inexact type errors * Fix flow * Fix errors about escapes in keywords (ref: #10455) * Update after rebase * Fix todo * Remove duplicated error when using += for defaults * Remove unnecessary throw * Nit: use ??
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 Patreon!
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
// 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!
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 (signup)!
- 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 explainations: /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.