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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[4.5.0] - 2026-05-20

Added

  • Add support for CSS Nesting — rules nested inside other rules (#621 by @jogibear9988)
  • Add support for @container container queries with nested rule body
  • Add support for Page Margin Boxes (@top-left, @bottom-right, @left-middle, etc.) inside @page
  • Add generic at-rule fallback — unknown @foo { ... } and @foo ...; rules are preserved as CssGenericAtRuleAST instead of being dropped
  • Add support for @counter-style, @font-feature-values, @scope, @view-transition, @position-try
  • Export new TypeScript types: CssGenericAtRuleAST, CssPageMarginBoxAST, CssPositionTryAST, CssScopeAST, CssViewTransitionAST, CssCounterStyleAST, CssFontFeatureValuesAST

Fixed

  • Fix selector parsing for complex nested selectors including :is(), :has(), :not()
  • Fix @page to correctly accept margin-box at-rule children
  • Fix bracket- and quote-aware position tracking for pseudo-functions

Changed

  • Upgrade to TypeScript 6.0.2
  • Upgrade to @rollup/plugin-terser 1.0.0
  • Drop Node 18 from CI (EOL April 2025) — minimum supported runtime is now Node 20

Security

  • Update lodash to 4.18.1
  • Update minimatch to 3.1.5
  • Update picomatch to 4.0.4

[4.4.4] - 2025-07-22

Changed

  • Switch from yarn to npm for package management
  • Switch from eslint to biome for code formatting and linting
  • Reformat codebase to comply with biome recommendations
  • Switch from webpack to rollup for bundling

Fixed

  • Fix module exports to ensure proper compatibility with bundlers
  • Add validation check to prevent future export issues

[4.4.3] - 2025-05-15

Security

  • Fix polynomial regular expression vulnerability on uncontrolled data
  • Refactor code to enable GitHub security static analysis

Performance

  • Improve parsing performance with minor optimizations
  • Replace regex patterns with string search (indexOf-based) for better performance

Added

  • Add new utility functions with comprehensive unit tests
  • Add improved formatting for CSS Grid template areas (#283 by @jogibear9988)

Fixed

  • Fix TypeScript error with ConstructorParameters in Parcel bundler (#444)

[4.4.2] - 2025-02-12

Fixed

  • Fix regular expression for parsing quoted values in parentheses

[4.4.0] - 2024-06-05

Added

  • Add support for CSS @starting-style at-rule (#319)

[4.3.3] - 2024-01-24

Changed

  • Update package export configuration (#271)

[4.3.2] - 2023-11-28

Security

  • Fix ReDoS vulnerability with crafted CSS strings - CVE-2023-48631

Fixed

  • Fix parsing issues with :is() and nested :nth-child() selectors (#211)

[4.3.1] - 2023-03-14

Security

  • Fix ReDoS vulnerability with crafted CSS strings - CVE-2023-26364

[4.3.0] - 2023-03-07

Changed

  • Update build toolchain and dependencies
  • Update package exports configuration and file structure

[4.2.0] - 2023-02-21

Added

  • Add support for CSS @container at-rule
  • Add support for CSS @layer at-rule

[4.1.0] - 2023-01-25

Added

  • Add support for ES Modules (ESM)

[4.0.2] - 2023-01-12

Fixed

  • Fix @import parsing when URL contains semicolons (#71)
  • Fix regression in selector parsing for attribute selectors (#77)

[4.0.1] - 2022-08-03

Fixed

  • Fix globalThis configuration for webpack to enable UMD module usage in Node.js environments

[4.0.0] - 2022-06-09

Changed

  • Fork from original css library to Adobe's @adobe/css-tools package
  • Convert codebase from JavaScript to TypeScript
  • Improve parsing performance by approximately 25%
  • Update all dependencies to latest versions
  • Remove source map support

Legacy Versions (Pre-Adobe Fork)

[3.0.0] - 2020-07-01

Changed

  • Bump major version due to major dependency updates and Node.js version requirement changes

[2.2.1] - 2015-06-17

Fixed

  • Fix parsing of escaped quotes in quoted strings

[2.2.0] - 2015-02-18

Added

  • Add parsingErrors property to list errors when parsing with silent: true
  • Accept EOL characters and all whitespace characters in at-rules such as @media

[2.1.0] - 2014-08-05

Added

  • Add inputSourcemaps option to disable input source map processing
  • Add sourcemap: 'generator' option to return the SourceMapGenerator object
  • Use inherits package for inheritance (fixes browser compatibility issues)

Changed

  • Change error message format and add .reason property to error objects

[2.0.0] - 2014-06-18

Added

  • Add non-enumerable parent reference to each AST node
  • Add support for @custom-media, @host, and @font-face at-rules
  • Allow commas inside selector functions
  • Allow empty property values
  • Add node.position.content property
  • Integrate css-parse and css-stringify libraries
  • Apply original source maps from source files

Changed

  • Change default options.position value to true
  • Remove comments from properties and values

Removed

  • Drop Component(1) support

Fixed

  • Fix assertion errors when selectors are missing

[1.6.1] - 2014-01-02

Fixed

  • Fix component.json configuration

[1.6.0] - 2013-12-21

Changed

  • Update dependencies

[1.5.0] - 2013-12-03

Changed

  • Update dependencies

[1.1.0] - 2013-04-04

Changed

  • Update dependencies

[1.0.7] - 2012-11-21

Fixed

  • Fix component.json configuration

[1.0.4] - 2012-11-15

Changed

  • Update css-stringify dependency

[1.0.3] - 2012-09-01

Added

  • Add Component support

[0.0.1] - 2010-01-03

Added

  • Initial release