Babel 7.29.0 is out!

This is the last minor release of Babel 7, as we are getting ready to release Babel 8.0.0. Babel 8.0.0-rc is also out today: go try it out!

This release include support for defining transpilation targets in @babel/standalone through a data-target attribute on <script> elements. It also adds support for the @babel/core async API to @babel/standalone.

Both of these changes are meant to ease the migration from Babel 7 to Babel 8.

You can read the whole changelog on GitHub. If you are already using Babel 8 beta, all the new 7.28.0 features are included in v8.0.0-rc.1.

Babel 7.28.0 is out!

This release includes support for babel.config.ts and babel.config.mts, the ES2026 Explicit Resource Management feature, the discard binding proposal, and the sourceType: "commonjs" option.

You can read the whole changelog on GitHub. If you are already using Babel 8 beta, all the new 7.28.0 features are included in v8.0.0-beta.1.

After almost two years since the first Babel 8 alpha release (8.0.0-alpha.0), we are finally ready.

All the breaking changes we were planning to include in Babel 8 are done, and we have removed a lot of the technical debt we've accumulated over the years and were unable to remove during Babel 7's lifetime.

We now need to test it in real projects to make sure we got everything right. We have been transpiling our own code using Babel 8 since early alpha versions, but one prerelease user is not enough. 😉

Babel 7.27.0 is out!

This release doesn't include any significant new feature, but it better aligns Babel's behavior with standard JavaScript and other tools.

The code printer will now also print the correct import attributes syntax by default, rather than expecting its users to explicitly enable an option for it.

We also tweaked the behavior of @babel/preset-typescript's rewriteImportExtensions option, to fix some differences when compared to TypeScript's --rewriteRelativeImportExtensions.

Lastly, we updated our estree compatibility plugin in @babel/parser to generate AccessorProperty nodes for accessor foo = "val" class properties, introduced by the decorators stage 3 proposal. Note that, for legacy compatibility reasons, @babel/parser only generates an ESTree-compatible AST for class features when the classFeatures option of the estree plugin is enabled.

There are multiple changes that may benefit plugin authors: you can read the whole changelog on GitHub.

Babel 7.26.0 was just released!

It enables by default support of two ECMAScript proposals that become standard in the last TC39 meeting, import attributes and inline regular expression modifiers, as well as parsing of Flow enums.

Babel now also allows plugins to provide asynchronous pre/post hooks, and has an [experimental mode](TODO: Link) to preserve tokens' positions when generating the transformed output.

You can read the whole changelog on GitHub.

Babel 7.25.0 is out!

@babel/preset-env now supports the duplicated named capturing groups proposal for Regular Expressions by default, as well as a bugfix for class fields when targeting Safari. This version also improves support for compiling JSON module imports to CommonJS, and adds support for config files to @babel/node's --eval mode.

You can read the whole changelog on GitHub.

Babel 7.24.0 is out!

We updated our Decorators implementation to match the latest version of the proposal, and we improved the way we transform class private fields and methods. We also added support for importing JSON modules in browsers and Node.js, an older Stage 3 proposal depending on Import Attributes.

You can read the whole changelog on GitHub.

On October 10th, 2023, I stumbled upon an arbitrary code execution vulnerability in Babel, which was subsequently assigned the identifier CVE-2023-45133. In this post, I’ll walk you through the journey of discovering and exploiting this intriguing flaw.

We just released Babel 7.23.0! 🎉

It includes transform support for the Decorator Metadata, Source Phase Import, Deferred Import Evaluation, and Optional Chaining Assignment proposals. We also updated our parser to support the new TypeScript 5.2 version, and added a transform option to let you use the .ts extension within TypeScript imports.

In addition to releasing version 7.23.0, we also recently published the first Babel 8 alpha release!

You can read the whole changelog on GitHub.

Babel 7.22.0 is out, with parsing/transform support for the Explicit Resource Management proposal, including both the sync and async variants, and with parsing support for the Import Attributes (an evolution of the old Import Assertions proposal).

We also updated our implementation of decorators following some changes in the proposal, and added support for the TypeScript import ... = and export ... = statements.

@babel/preset-env now includes transform support for the v regular expressions flag, which was recently approved as part of the ECMAScript standard, by default. Lastly, we renamed all the plugins for stable ECMAScript features from -proposal- to -transform-.

You can read the whole changelog on GitHub.