Acorn-JSX is a plugin for Acorn that provides an alternative, faster parser for React.js JSX syntax. It’s useful for tools that need to parse JavaScript into a JSX AST, for example language services or code analysis, rather than transpiling directly to ES5.
Project status
- Maintenance status: Appears quiet or effectively in maintenance mode. The latest concrete update entries shown are from 2020-09, and there is no evidence in the provided update summaries of continuing changes through 2023-2026 (despite an upstream push timestamp in 2022-12).
- Update cadence: Historically there were several updates clustered around 2017-2020, but there is a multi-year gap after 2020 compared to today (2026-09). From the evidence provided, no regular cadence is visible in recent years.
AI summary generated
Recent updates
5.3.1
Release 5.3.1 contains a small code change plus a new regression test related to parsing JSX inside generator yield expressions. No release notes were provided, so the behavior change is only evident from the code diff.
5.3.0
Release 5.3.0 updates the project’s toolchain and compatibility matrix to support newer Acorn versions, most notably Acorn 8. There are no release notes provided, and the code diff only shows changes to CI configuration, package dependency declarations, and the test suite.
5.2.0
Release 5.2.0 tightens the JSX parser so that certain characters are no longer accepted as raw JSX text. In addition to the documented JSXText restriction, the codebase includes a non-trivial internal refactor around how `acorn` token types are created, cached, and exposed to other plugins.
Breaking5.0.1
Release 5.0.1 is a small patch intended to restore compatibility with Node.js 4.x. The code changes are focused on runtime syntax compatibility (removing a default parameter) and minor module import adjustments.
5.0.0
Release 5.0.0 is described only as an upgrade for compatibility with a newer acorn. The diff shows a much larger refactor: the JSX plugin implementation has been moved into index.js, the packaging model changed to depend on acorn via peerDependencies, and the public usage API in README and tests was updated accordingly.
Breaking4.1.1
Release 4.1.1 fixes how acorn-jsx represents JSX fragments in the produced AST. Specifically, fragment nodes that were introduced as incorrect element node types in 4.1.0 are now emitted with the correct fragment node types.
Breaking4.1.0
Release 4.1.0 adds support for JSX fragments. This enables developers to use JSX fragment syntax without additional wrappers.
Features