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npm / postcss-preset-env

postcss-preset-env

What changed in postcss-preset-env 11, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-19.

1 new APIs and options1 performance1 behavior and defaults

See which of these apply to your code, ranked, in your agent:

npx @unstale/cli init

@unstale/cli on npm

postcss-preset-env 113 changes

New APIs and options 1

  • Added @csstools/postcss-custom-functions to postcss-preset-env.

    11.6.0release notes

Performance 1

  • Many plugins now have bounds to prevent CPU starvation or out-of-memory conditions.

    11.5.5release notes

Behavior and default changes 1

  • Implements more of the current spec, changing how mixins are processed.

    11.5.5release notes