What's Changed

Bug fixes

• do not emit invalid minus unary operator (the browser discards values like calc(-(-12px))
• improve rounding so it is more spec-compliant in edge cases
• preserve invalid declarations with unary minus, instead of converting them to valid declarations

Full Changelog: v11.2.0...v11.2.1

What's Changed

Features

• postcss-calc now offers two modes. By default, it tries to follow the spec
  as closely as possible by not unwrapping calc() value. This allows the browser to transform negative and floating point values, especially in cases where only integers are allowed in the CSS property.
  If you want to remove the calc() function when it wraps a single value, use unwrapSingleValue: true. This allows you to get rid of calc() and replace it with a single number wherever that is possible.

Bug fixes

• postcss-calc performs rounding in a way that's hopefully closer to the specification
• fix cases where the sign() function was not computed correctly

Migration

The published unwrapSingleNegativeNumber option remains available as a
deprecated alias for unwrapSingleValue.

Full Changelog: v11.1.2...v11.2.0

What's Changed

• fix: preserve escaped and otherwise unusual identifiers in #316
• Fix unknown function handling in #317

Full Changelog: v11.1.1...v11.1.2

What's Changed

• fix: preserve calc() in declarations when result is negative in #310

Full Changelog: v11.1.0...v11.1.1

What's Changed

• feat: add reduceCalc for usage without PostCSS by @phuoccss in #304
• feat: rethink the standalone API by @ludofischer in #307

Full Changelog: v11.0.3...v11.1.0

What's Changed

Performance improvements

• Improve performance by reducing the number of parsing and serialization steps

Full Changelog: v11.0.2...v11.0.3

What's Changed

Performance improvements

• Improve performance when processing calculations with many additions or multiplications.

Full Changelog: v11.0.1...v11.0.2

What's Changed

Bug fixes

• Omit leading zeroes when serializing finite fractional numbers, such as 0.5 as .5.

Full Changelog: v11.0.0...v11.0.1

11.0.0

Breaking changes

• Require Node.js ^22.22.3, ^24.15, or >=26.0.

• Publish an ESM package with an explicit exports entry point. CommonJS require('postcss-calc') remains
  supported on the supported Node.js versions.

• Remove the preserve option. Transformations now always update declarations, enabled media-query
  parameters, and enabled selectors in place.

Features

• Rewrite the calculation engine around a CSS-aware tokenizer, Pratt parser, canonical AST, simplifier,
  and serializer.

• Add simplification support for modern CSS math functions, including abs(), sign(), mod(), rem(),
  round(), trigonometric functions, pow(), sqrt(), hypot(), log(), and exp().

• Improve public TypeScript declarations, including the exported PostCssCalcOptions type.

Bug fixes

• Preserve correct grouping when simplifying subtractions involving custom properties and other opaque
  expressions.

• Improve numerical precision and rounding, including signed-zero and exact-multiple mod()/rem()
  behavior.

• Fix handling of identifier-like negative tokens and selector calculations.

• Maintain left-to-right evaluation order when folding product terms.

chore: ignore type formatting for now

Breaking Changes

Requires Node.js 22.12 for the ability to require() ESM modules

Fixes

The parser has been entirely rewritten (thanks @dkryaklin ) so most of the issues where the parser would error out with more complicated calc() expressions should be fixed.

chore(release): 10.2.0-rc.0

Bug Fixes

• fix: handle calc keywords correctly by @ludofischer in https://github.com/postcss/postcss-calc/pull/234

Full Changelog: https://github.com/postcss/postcss-calc/compare/v10.1.0...v10.1.1

Features

• add support for lh & rlh units (9b6d7a1)

Bug Fixes

• Ignore calc-size from detection (#230) (cac6f39)

Bug Fixes

• fix: add support for svh, lvh, dvh, svw, lvw, dvw, svmin, lvmin, dvmin, svmax, lvmax, dvmax units by @geecko86 in #218

Bug Fixes

• add support for container query units (#214) (3f2b43a), closes #199
• update postcss-selector-parser (3606777)
• update postcss-selector-parser (a03fb73)

Breaking changes

Drop support for Node.js 14, 16, 19 and 21. The release is otherwise identical to the previous one.

Bug fixes

• fix disappearing calc() expression when source contains extra brackets (18bb47bd0)

Breaking Changes

This release should be functionally identical to the previous (8.2.4) release, except that it officially drops compatibility with Node older than Node 14.

Patch Changes

• convert source to CommonJS and publish untranspiled code (b55adcb)

Bug Fixes

• improve types (f2cce1b)

Bug Fixes

• respect CSS var when reducing (99d9fa5)

Bug Fixes

• preserve brackets around functions (0b70a1d), closes #113 #115

Features

• add types (#155) (4c96c79)

Features

• avoid fatal error (#137) (125be6a)

8.0.0

• Breaking: Updated PostCSS from v7.x to v8.x (#125)

• Fixed: reduction

7.0.4

• Fixed: strips away important factors from multiplications in calc() (#107)

7.0.3

• Fixed: substracted css-variable from zero (#111)

• Fixed: incorrect reduction of subtraction from zero (#88)
• Fixed: doesn't remove calc for single function
• Fixed: relax parser on unknown units (#76)
• Fixed: handle numbers with exponen composed (#83)
• Fixed: handle plus sign before value (#79)
• Fixed: better handle precision for nested calc (#75)
• Fixed: properly handle nested add and sub expression inside sub expression (#64)
• Fixed: handle uppercase units and functions (#71)
• Fixed: do not break calc with single var (cssnano/cssnano#725)
• Updated: postcss to 7.0.27 (patch)
• Updated: postcss-selector-parser to 6.0.2
• Updated: postcss-value-parser to 4.0.2

• Updated: postcss to 7.0.2 (patch)
• Updated: postcss-selector-parser to 5.0.0-rc.4 (patch)
• Updated: postcss-value-parser to 3.3.1 (patch)

• Changed: Updated postcss-selector-parser to version 5.0.0-rc.3
• Changed: Dropped reduce-css-calc as a dependency
• Fixed: Support constant() and env() (#42, #48)
• Fixed: Support custom properties with "calc" in its name (#50)
• Fixed: Remove unnecessary whitespace around * and / (cssnano#625)
• Fixed: Arithmetic bugs around subtraction (#49)
• Fixed: Handling of nested calc statements (reduce-css-calc#49)
• Fixed: Bugs regarding complex calculations (reduce-cs-calc#45)
• Fixed: 100% incorrectly being transformed to 1 (reduce-css-calc#44)
• Added: support for case-insensitive calc statements

• Fixed: use PostCSS 7 (thanks to @douglasduteil)

• Fixed: throwing error for attribute selectors without a value

• Breaking: Updated PostCSS from v5.x to v6.x, and reduce-css-calc from v1.x to v2.x (thanks to @andyjansson).

• Fixed: avoid security issue related to reduce-css-calc@< 1.2.4.

• Added: support for selector transformation via selectors option. (#29 - @uniquegestaltung)

• Fixed: support for multiline value (#27)

• Added: "mediaQueries" option for @media support (#22)

• Added: "warnWhenCannotResolve" option to warn when calc() are not reduced to a single value

• Removed: compatibility with postcss v4.x
• Added: compatibility with postcss v5.x

• Added: compatibility with postcss v4.1.x (#12)

• Fixed: preserve option does not create duplicated values (#7)

• Added: compatibility with postcss v4.x
• Changed: partial compatiblity with postcss v3.x (stack traces have lost filename)

• Added: GNU like exceptions (#4)
• Added: precision option (#5)
• Added: preserve option (#6)

• Added: source of the error (gnu like message) (fix #3)

• Fixed: correctly ignore unrecognized values (fix #2)

• Changed: Plugin now return a function to have a consistent api. (ref 1, ref 2)

✨ First release based on rework-calc v1.1.0 (code mainly exported to reduce-css-calc)