3.5.1 (June 7, 2018)

  • Bumped CSSTree to 1.0.0-alpha.29 (fixes some issues)

3.5.0 (January 14, 2018)

3.4.0 (November 3, 2017)

  • Added percent sign removal for zero percentages for some properties that is safe (@RubaXa, #286)
  • Removed unit removal for zero values in -ms-flex due it breaks flex in IE10/11 (#362)
  • Improved performance of selectors comparison (@smelukov, #343)

3.3.1 (October 17, 2017)

  • Fixed merge of position declarations when sticky fallback is using (@gruzzilkin, #356)

3.3.0 (October 12, 2017)

  • Migrated to CSSTree 1.0.0-alpha25
    • Changed AST format (see CSSTree change log for details)
    • Fixed performance issue when generate CSS with source map (quadratic increase in time depending on the size of the CSS)

3.2.0 (September 10, 2017)

  • Fixed named color compression to apply only when an identifier is guaranteed to be a color
  • Added lifting of @keyframes to the beginning of style sheet (chunk), but after @charset and @import rules
  • Added removal of @keyframes, @media and @supports with no prelude
  • Added removal of duplicate @keyframes (#202)
  • Added new option forceMediaMerge to force media rules merging. It's unsafe in general, but works fine in many cases. Use it on your own risk (#350)
  • Bumped CSSTree to 1.0.0-alpha23

3.1.1 (April 25, 2017)

  • Fixed crash on a number processing when it used not in a list (#335)

3.1.0 (April 24, 2017)

  • Implemented optimisation for none keyword in border and outline properties (@zoobestik, #41)
  • Implemented replacing rgba(x, x, x, 0) to transparent
  • Fixed plus sign omitting for numbers following identifier, hex color, number or unicode range, since it can change the meaning of CSS (e.g. calc(1px+2px) has been optimized to calc(1px2px) before, now it stays the same)
  • Improved usage filtering for nested selectors (i.e. for :nth-*(), :has(), :matches and other pseudos)
  • Implemented blacklist filtering in usage (#334, see Black list filtering)
  • Improved white space removing, now white spaces are removing in the beginning and at the ending of sequences, and between stylesheet and block nodes
  • Bumped CSSTree to 1.0.0-alpha19

3.0.1 (March 14, 2017)

  • Fixed declaration merging when declaration contains an !important

3.0.0 (March 13, 2017)

  • Migrated to CSSTree as AST backend and exposed its API behind syntax property
  • Extracted CLI into standalone package css/csso-cli

2.3.1 (January 6, 2017)

  • Added \0 IE hack support (#320)

2.3.0 (October 25, 2016)

  • Added beforeCompress and afterCompress options support (#316)
  • Fixed crash on empty argument in function (#317)

2.2.1 (July 25, 2016)

  • Fixed shorthand optimisation issue when value has a color value or something unknown (#311)
  • Fixed cursor broken fallback (#306)

2.2.0 (June 23, 2016)

  • Implement AST cloning by adding clone() function and clone option for compress() function (#296)
  • Fix parse and translate attribute selector with flags but w/o operator (i.e. [attrName i])
  • Don't merge rules with flagged attribute selectors with others (#291)
  • Take in account functions when merge TRBL-properties (#297, thanks to @ArturAralin)
  • Improve partial merge (#304)
  • Tweak scanner, reduce code deoptimizations and other small improvements

2.1.1 (May 11, 2016)

  • Fix wrong declaration with \9 hack merge (#295)

2.1.0 (May 8, 2016)

  • New option comments to specify what comments to left: exclamation, first-exclamation and none
  • Add offset to CSS parse error details
  • Fix token offset computation

2.0.0 (April 5, 2016)

  • No more gonzales AST format and related code
  • minify() and minifyBlock() is always return an object as result now (i.e. { css: String, map: SourceMapGenerator or null })
  • parse()
    • Returns AST in new format (so called internal)
    • Dynamic scanner implemented
    • New AST format + dynamic scanner = performance boost and less memory consumption
    • No more context argument, context should be specified via options
    • Supported contexts now: stylesheet, atrule, atruleExpression, ruleset, selector, simpleSelector, block, declaration and value
    • Drop needPositions option, positions option should be used instead
    • Drop needInfo option, info object is attaching to nodes when some information is requested by options
    • options should be an object, otherwise it treats as empty object
  • compress()
    • No more AST converting (performance boost and less memory consumption)
    • Drop outputAst option
    • Returns an object as result instead of AST (i.e. { ast: Object })
  • Drop methods: justDoIt(), stringify(), cleanInfo()

1.8.1 (March 30, 2016)

  • Don't remove spaces after function/braces/urls since unsafe (#289)

1.8.0 (March 24, 2016)

  • Usage data support:
    • Filter rulesets by tag names, class names and ids white lists.
    • More aggressive ruleset moving using class name scopes information.
    • New CLI option --usage to pass usage data file.
  • Improve initial ruleset merge
    • Change order of ruleset processing, now it's left to right. Previously unmerged rulesets may prevent lookup and other rulesets merge.
    • Difference in pseudo signature just prevents ruleset merging, but don't stop lookup.
    • Simplify block comparison (performance).
  • New method csso.minifyBlock() for css block compression (e.g. style attribute content).
  • Ruleset merge improvement: at-rules with block (like @media or @supports) now can be skipped during ruleset merge lookup if doesn't contain something prevents it.
  • FIX: Add negation (:not()) to pseudo signature to avoid unsafe merge (old browsers doesn't support it).
  • FIX: Check nested parts of value when compute compatibility. It fixes unsafe property merging.

1.7.1 (March 16, 2016)

  • pass block mode to tokenizer for correct parsing of declarations properties with // hack
  • fix wrongly @import and @charset removal on double exclamation comment

1.7.0 (March 10, 2016)

  • support for CSS Custom Properties (#279)
  • rework RTBL properties merge – better merge for values with special units and don't merge values with CSS-wide keywords (#255)
  • remove redundant universal selectors (#178)
  • take in account !important when check for property overriding (#280)
  • don't merge text-align declarations with some values (#281)
  • add spaces around /deep/ combinator on translate, since it together with universal selector can produce a comment
  • better keyword and property name resolving (tolerant to hacks and so on)
  • integration improvements
    • compression log function could be customized by logger option for compress() and minify()
    • make possible to set initial line and column for parser

1.6.4 (March 1, 2016)

  • npm publish issue (#276)

1.6.3 (February 29, 2016)

  • add file to generated source map since other tools can relay on it in source map transform chain

1.6.2 (February 29, 2016)

  • tweak some parse error messages and their positions
  • fix :not() parsing and selector groups in :not() is supported now (#215)
  • needPosition parser option is deprecated, positions option should be used instead (needPosition is used still if positions option omitted)
  • expose internal AST API as csso.internal.*
  • minify() adds sourcesContent by default when source map is generated
  • bring back support for node.js 0.10 until major release (#275)

1.6.1 (February 28, 2016)

  • fix exception on zero length dimension compress outside declaration (#273)

1.6.0 (February 27, 2016)

  • source maps support
  • parser remake:
    • various parsing issues fixed
    • fix unicode sequence processing in ident (#191)
    • support for flags in attribute selector (#270)
    • position (line and column) of parse error (#109)
    • 4x performance boost, less memory consumption
  • compressor refactoring
    • internal AST is using doubly linked lists (with safe transformation support during iteration) instead of arrays
    • rename restructuring to restructure option for minify()/compress() (restructuring is alias for restructure now, with lower priority)
    • unquote urls when possible (#141, #60)
  • setup code coverage and a number of related fixes
  • add eslint to check unused things

1.5.4 (January 27, 2016)

  • one more fix (in restructRuleset this time) with merge of rulesets when a ruleset with same specificity places between them (#264)
  • disable partial merge of rulesets in @keyframes rulesets (until sure it's correct)

1.5.3 (January 25, 2016)

  • don't override display values with different browser support (#259)
  • fix publish issue (one of modules leak in development state)

1.5.2 (January 24, 2016)

  • don't merge rulesets if between them a ruleset with same specificity (#264)

1.5.1 (January 14, 2016)

  • ensure - is not used as an identifier in attribute selectors (thanks to @mathiasbynens)
  • fix broken justDoIt() function
  • various small fixes

1.5.0 (January 14, 2016)

Parser

  • attach minus to number

Compressor

  • split code base into small modules and related refactoring
  • introduce internal AST format for compressor (gonzales→internal and internal→gonzales convertors, walkers, translator)
  • various optimizations: no snapshots, using caches and indexes
  • sort selectors, merge selectors in alphabet order
  • compute selector's specificity
  • better ruleset restructuring, improve compression of partially equal blocks
  • better ruleset merge – not only closest but also disjoined by other rulesets when safe
  • join @media with same query
  • outputAst – new option to specify output AST format (gonzales by default for backward compatibility)
  • remove quotes surrounding attribute values in attribute selectors when possible (#73)
  • replace from→0% and 100%→to at @keyframes (#205)
  • prevent partial merge of rulesets at @keyframes (#80, #197)

API

  • walker for gonzales AST was implemented

CLI

  • new option --stat (output stat in stderr)
  • new optional parameter level for --debug option

1.4.4 (December 10, 2015)

  • prevent removal of spaces after braces that before identifier that breaking at-rules expressions (#258)

1.4.3 (December 4, 2015)

  • fix unicode-range parsing that cause to wrong function detection (#250)

1.4.2 (November 9, 2015)

  • allow spaces between progid: and rest part of value for IE's filter property as autoprefixer generates this kind of code (#249)
  • fixes for Windows:
    • correct processing new lines
    • normalize file content in test suite
  • fixes to work in strict mode (#252)
  • init compressor dictionaries for every css block (#248, #251)
  • bump uglify-js version

1.4.1 (October 20, 2015)

  • allow merge for display property (#167, #244)
  • more accurate rect (clip property value) merge
  • fix typo when specifying options in cli (thanks to @Taritsyn)
  • fix safe unit values merge with keyword values (#244)
  • fix wrong descendant combinator removal (#246)
  • build browser version on prepublish (thanks to @silentroach)
  • parser: store whitespaces as single token (performance and reduce memory consumption)
  • rearrange compress tests layout

1.4 (October 16, 2015)

Bringing project back to life. Changed files structure, cleaned up and refactored most of sources.

Common

  • single code base (no more src folder)
  • build browser version with browserify (no more make, and web folder), browser version is available at dist/csso-browser.js
  • main file is lib/index.js now
  • minimal node.js version is 0.12 now
  • restrict file list to publish on npm (no more useless folders and files in package)
  • add jscs to control code style
  • automate gh-pages update
  • util functions reworked
  • translator reworked
  • test suite reworked
  • compressor refactored
  • initial parser refactoring

API

  • new method minify(src, options), options:
    • restructuring – if set to false, disable structure optimisations (true by default)
    • debug - outputs intermediate state of CSS during compression (false by default)
  • deprecate justDoIt() method (use minify instead)
  • rename treeToString() method to stringify()
  • drop printTree() method
  • AST node info
    • column and offset added
    • ln renamed to line
    • fix line counting across multiple files and input with CR LF (#147)

CLI

  • completely reworked, use clap to parse argv
  • add support for input from stdin (#128)
  • drop undocumented and obsoleted options --rule and --parser (suppose nobody use it)
  • drop -off alias for --restructure-off as incorrect (only one letter options should starts with single -)
  • new option --debug that reflecting to options.debug for minify

Parsing and optimizations

  • keep all exclamation comments (#194)
  • add /deep/ combinator support (#209)
  • attribute selector
    • allow colon in attribute name (#237)
    • support for namespaces (#233)
  • color
    • support all css/html colors
    • convert hsla to rgba and hls to rgb
    • convert rgba with 1 as alpha value to rgb (#122)
    • interpolate rgb and rgba percentage values to absolute values
    • replace percentage values in rgba for normalized/interpolated values
    • lowercase hex colors and color names (#169)
    • fix color minification when hex value replaced for color name (#176)
    • fit rgb values to 0..255 range (#181)
  • calc
    • remove spaces for multiple operator in calc
    • don't remove units inside calc (#222)
    • fix wrong white space removal around + and - (#228)
  • don't remove units in flex property as it could change value meaning (#200)
  • don't merge \9 hack values (#231)
  • merge property values only if they have the same functions (#150, #227)
  • don't merge property values with some sort of units (#140, #161)
  • fix !important issue for top-right-bottom-left properties (#189)
  • fix top-right-bottom-left properties merge (#139, #175)
  • support for unicode-range (#148)
  • don't crash on ruleset with no selector (#135)
  • tolerant to class names that starts with digit (#99, #105)
  • fix background compressing (#170)

1.3.12 (October 8, 2015)

  • Case insensitive check for !important (#187)
  • Fix problems with using csso as cli command on Windows (#83, #136, #142 and others)
  • Remove byte order marker (the UTF-8 BOM) from input
  • Don't strip space between funktion-funktion and funktion-vhash (#134)
  • Don't merge TRBL values having \9 (hack for IE8 in bootstrap) (#159, #214, #230, #231 and others)
  • Don't strip units off dimensions of non-length (#226, #229 and others)

1.3.7 (February 11, 2013)

  • Gonzales 1.0.7.

1.3.6 (November 26, 2012)

  • Gonzales 1.0.6.

1.3.5 (October 28, 2012)

1.3.4 (October 10, 2012)

1.3.3 (October 9, 2012)

1.3.2 (October 8, 2012)

1.3.1 (October 8, 2012)

1.3.0 (October 4, 2012)

  • PeCode CSS parser replaced by Gonzales CSS parser