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postcss/postcss-js

GitHub
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Last release:

PostCSS JS is a PostCSS-based tool for working with CSS-in-JS, letting you process style objects and use PostCSS plugins such as Stylelint and RTLCSS. It can compile CSS-in-JS to CSS, convert CSS to CSS-in-JS (objectify), and parse style objects into a PostCSS Root for further processing.

Project status

  • Active maintenance: there have been recent activity on GitHub (last upstream push 2026-08-11) and an update published in 2026 (5.1.0 on 2026-02-13), suggesting the project is still actively developed rather than dormant.
  • Update cadence appears moderate, not rapid: clustered updates in 2025-12 (5.0.2 and 5.0.3) and a next update in 2026-02 (5.1.0), then a gap in published updates until at least 2026-02, despite ongoing upstream pushes (notably 2026-08-11).

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Recent updates

  • 5.1.0

    Release 5.1.0 is described as adding TypeScript types. However, the diff also includes runtime JavaScript changes in the parser and objectifier modules, plus updates to dev tooling and lockfiles.

    Features

  • 5.0.3

    Release 5.0.3 primarily focuses on performance and dependency reduction for the `objectifier` module. The release notes say it reduced dependencies and sped up `objectifier`, with no mention of behavior changes.

  • 5.0.2

    Release 5.0.2 is documented as a performance improvement, specifically that “dashify” was made much faster. The code diff confirms a major reimplementation of dashify (regex-based replacements replaced with a manual character loop), plus several CI workflow and dev dependency updates.

    Breaking

  • 5.0.1

    Release 5.0.1 updates postcss-js objectifier behavior when the `stringifyImportant` option is enabled, specifically around handling of multiple declarations with and without `!important`. The main change is in the merge logic used when combining rules for the same selector/property.

  • 5.0.0

    Release 5.0.0 primarily updates runtime support and CI configuration. The release notes document dropping Node.js 12, 14, 16, and 18 support, and the diff confirms that change while also tightening the supported Node.js version range.

    Breaking

  • 4.1.0

    Release 4.1.0 adds a new `stringifyImportant` option. This likely affects how certain values are serialized when using the relevant functionality, but the release notes do not describe behavior changes or defaults.

    Features