4.1.11

Bug Fixes

• fix CVE-2021-28092

4.1.10

Bug Fixes

• stylehacks does not throw error on [attr] selector

4.1.9

Performance Improvements

• postcss-colormin: increase performance
• postcss-discard-comments: increase performance
• postcss-merge-rules increase performance
• postcss-minify-params increase performance
• postcss-minify-selectors: increase performance
• postcss-normalize-display-values: increase performance
• postcss-normalize-positions: increase performance
• postcss-normalize-repeat-style: increase performance
• postcss-normalize-string: increase performance
• postcss-normalize-timing-functions: increase performance
• postcss-normalize-whitespace: increase performance
• postcss-ordered-values: increase performance
• postcss-reduce-transforms: increase performance
• postcss-svgo: increase performance

Bug Fixes

• postcss-merge-longhand handle uppercase properties and values
• postcss-minify-gradients handle uppercase properties and values
• postcss-minify-params do break @page rules
• postcss-reduce-idents handle uppercase at-rules
• postcss-reduce-initial now uses repeat as initial value for mask-repeat
• postcss-reduce-initial handle uppercase value when you convert to initial
• stylehacks handle uppercase properties and values

4.1.8

Performance Improvements

• initial loading time (require('cssnano')).

Bug Fixes

• postcss-merge-longhand correctly merging border properties with custom properties.

4.1.7

Bug Fixes

• republish cssnano due broken release.

4.1.6

Bug Fixes

• postcss-merge-longhand doesn't throw error when merge a border property.

4.1.5

Bug Fixes

• cssnano now allow to toggling of plugins in presets using boolean configuration option.
• postcss-merge-longhand doesn't merge properties with unset.
• postcss-merge-longhand correctly merge borders with custom properties.
• postcss-merge-longhand doesn't merge redundant values if declarations are of different importance.

Other changes

• postcss-calc updated to 7.0.0 version.

4.1.4

Other changes

• css-declaration-sorter now use PostCSS 7.
• postcss-calc now use PostCSS 7.

4.1.3

Other changes

• postcss-minify-font-values now use PostCSS 7.
• postcss-discard-duplicates now use PostCSS 7.

4.1.2

Bug Fixes

• postcss-svgo now handle DataURI with uppercase data value (DATA:image/*;...).

4.1.1

Bug Fixes

• css-declaration-sorter was removed from default prevent.
• postcss-normalize-timing-functions doesn't lowercased property anymore.
• postcss-normalize-positons now handles uppercase properties.
• postcss-normalize-url now is case-insensitive.
• postcss-merge-idents now is case-insensitive.
• postcss-merge-rules now is case-insensitive.
• postcss-minify-selectors now is case-insensitive.
• postcss-minify-font-values now is case-insensitive.
• postcss-normalize-unicode now has correct dependencies.
• postcss-minify-params now has correct dependencies.

Other changes

• cssnano-preset-advanced use Autoprefixer 9.
• use PostCSS 7 in all plugins.

4.1.0

Bug Fixes

• postcss-merge-longhand doesn't mangle borders.

Features

• postcss-ordered-values support ordering animation values.

4.0.5

Bug Fixes

• postcss-merge-longhand now correctly merges borders with custom properties.
• postcss-merge-longhand doesn't throw error in some border merge cases.

4.0.4

Bug Fixes

• postcss-merge-longhand doesn't drop border-width with custom property from border shorthand.
• postcss-merge-longhand doesn't convert currentColor.
• postcss-merge-longhand doesn't merge border properties if there is a shorthand property between them.

4.0.3

Bug Fixes

• postcss-merge-longhand incorrect minification of border (border-*) declarations.

4.0.2

Bug Fixes

• postcss-merge-longhand don't explode declarations with custom properties.
• postcss-colormin now better transform to hsl.

4.0.1

Bug Fixes

• browserslist version incompatibility with caniuse-api.

4.0.0

Breaking changes

• We dropped support for Node 4, now requiring at least Node 6.9.

Features

• postcss-merge-longhand now optimises border-spacing property.

Bug Fixes

• postcss-normalize-unicode doesn't change U to lowercase for IE <= 11 and Edge <= 15.
• postcss-merge-longhand works with custom properties (Example a { border-style:dotted; border-style:var(--variable) }) correctly.
• postcss-ordered-values handle border property with invalid border width value correctly.
• postcss-merge-rules handles :-ms-input-placeholder and ::-ms-input-placeholder selectors correctly.
• postcss-merge-rules works with all property correctly.
• postcss-normalize-url don't handle empty url function.
• postcss-normalize-url handles data and *-extension:// URLs correctly.
• postcss-colormin adds whitespace after minified value and before function.
• postcss-minify-font-values better escapes font name.
• postcss-minify-params doesn't remove all for IE.

Other changes

• update all dependencies to latest.
• better handles uppercase selectors/properties/values/units.

4.0.0-rc.2

Features

• Includes the new release candidate for postcss-selector-parser 3.
• Refactors comments tokenizing in postcss-discard-comments to be more
  memory efficient.
• Adds css-declaration-sorter for improved gzip compression efficiencies
  (thanks to @Siilwyn).
• postcss-svgo now optimises base 64 encoded SVG where possible
  (thanks to @evilebottnawi).
• stylehacks now supports @media \0screen\,screen\9 {} hacks
  (thanks to @evilebottnawi).

Bug Fixes

• Fixed handling of package.json configuration (thanks to @andyjansson).
• Fixed resolveConfig for a Root node without a source property
  (thanks to @darthmaim).
• Improved radial gradient handling (thanks to @pigcan).
• stylehacks now properly accounts for vendor prefixes
  (thanks to @evilebottnawi).

4.0.0-rc.1

Bug Fixes

• cssnano: Resolved an issue with external configuration which wasn't
  being loaded correctly (thanks to @andyjansson).
• postcss-minify-params: Resolved an issue with cssnano's handling of the
  @value syntax from css-modules to better integrate with css-loader.

4.0.0-rc.0

Since version 4 has been in-development for some time, we thought it would be
best to release an alpha version so that we could catch any issues before
the actual release.

Breaking changes

• cssnano & its plugins have been upgraded to PostCSS 6.x. Please ensure that
  for optimal results that you use cssnano with a PostCSS 6 compatible runner
  & that any other plugins are also using PostCSS 6.
• cssnano is now essentially a preset loader and does not contain any built-in
  transforms (instead, it delegates to cssnano-preset-default by default).
  Due to the new architecture, it's not possible to exclude asynchronous
  transforms and run it synchronously, unlike in 3.x. Any transforms that
  were "core" modules have now been extracted out into separate packages.
• Because of the new preset system, cssnano will not accept any transformation
  options; these must be set in the preset. The option names remain mostly the
  same, except some cases where "core" modules have been extracted out:

• core is now normalizeWhitespace.

• reduceBackgroundRepeat is now normalizeRepeatStyle.
• reduceDisplayValues is now normalizeDisplayValues.
• reducePositions is now normalizePositions.
• reduceTimingFunctions is now normalizeTimingFunctions.
• styleCache is now rawCache.

When excluding transforms, we now have an exclude option (in 3.x this was
named disable). Similarly, the safe option was removed; the defaults
are now much less aggressive.
* By default, the following transforms are no longer applied to any input CSS.
You may see an increased output file size as a result:

• autoprefixer
• postcss-discard-unused
• postcss-merge-idents
• postcss-reduce-idents
• postcss-zindex

Note that you can load cssnano-preset-advanced instead which does contain
these transforms.
* We no longer detect previous plugins to silently exclude our own, and now
consider this to be an anti-pattern. So postcss-filter-plugins was removed.
* We also changed some options to make the default transforms safer:

• postcss-minify-font-values: removeAfterKeyword set to false from true.
• postcss-normalize-url: stripWWW set to false from true.

• cssnano now does not accept the sourcemap shortcut option; please refer
  to the PostCSS documentation on sourcemaps. The quickstart.js file included
  with this module will give you a good starting point.

• cssnano.process is no longer a custom method; we use the built-in process
  method exposed on each PostCSS plugin. The new signature is
  cssnano.process(css, postcssOpts, cssnanoOpts), in 3.x it was
  cssnano.process(css, cssnanoOpts).
• We dropped support for Node 0.12, now requiring at least Node 4.
• Finally, cssnano is now developed as a monorepo, due to the fact that some
  transforms have a lot of grey area/overlap. Due to this, some modules have
  been refactored to delegate responsibility to others, such that duplication
  of functionality is minimized. For instance, postcss-colormin will no
  longer compress whitespace or compress numbers, as those are handled by
  postcss-normalize-whitespace & postcss-convert-values respectively.

Other changes

• Due to the PostCSS 6 upgrade, we have been able to reduce usage of custom
  methods, such as node clone behaviour. In cases where some utility
  has been used by several plugins it is now a separate package, reducing
  cssnano's footprint.
• cssnano now makes much better use of Browserslist. postcss-colormin &
  postcss-reduce-initial were enhanced with different behaviour depending
  on which browsers are passed. And now, the footprint for the caniuse-db
  dependency is much smaller thanks to caniuse-lite - 7 times smaller as
  of this writing. This makes cssnano much faster to download from npm!

3.10.0

• cssnano will no longer console.warn any messages when using deprecated
  options; these are now sent to PostCSS. You will be able to see them if you
  use a PostCSS runner with built-in messages support, or alternately by
  loading postcss-reporter or postcss-browser-reporter in your plugins list.
• Prepares support for grid identifier reduction by adding it to the list
  of optimisations turned off when options.safe is set to true.
• Adds support for normalizing unicode-range descriptors. Values will
  be converted when the code matches 0 & f in the same place on both sides
  of the range. So, u+2000-2fff can be converted to u+2???, but
  u+2100-2fff will be left as it is.

3.9.1

• Resolves an integration issue with v3.9.0, where undefined values
  would attempt to be parsed.

3.9.0

• Adds a new option to normalize wrapping quotes for strings & joining
  multiple-line strings into a single line. This optimisation can potentially
  reduce the final gzipped size of your CSS file.

3.8.2

• Resolves an issue where display: list-item inline flow would be normalized
  to inline list-item rather than inline-list-item (thanks to @mattbasta).

3.8.1

• Adds a quick start file for easy integration with Runkit. Try cssnano online
  at https://runkit.com/npm/cssnano.

3.8.0

• Adds support for normalizing multiple values for the display property. For
  example block flow can be simplified to block.

3.7.7

• Further improves CSS mixin handling; semicolons will no longer be stripped
  from rules as well as declarations.

3.7.6

• Resolves an issue where the semicolon was being incorrectly stripped
  from CSS mixins.

3.7.5

• Resolves an issue where the safe flag was not being persisted across
  multiple files (thanks to @techmatt101).

3.7.4

• Improves performance of the reducePositions transform by testing
  against hasOwnProperty instead of using an array of object keys.
• Removes the redundant indexes-of dependency.

3.7.3

• Unpins postcss-filter-plugins from 2.0.0 as a fix has landed in the new
  version of uniqid.

3.7.2

• Temporarily pins postcss-filter-plugins to version 2.0.0 in order to
  mitigate an issue with uniqid 3.0.0.

3.7.1

• Enabling safe mode now turns off both postcss-merge-idents &
  postcss-normalize-url's stripWWW option.

3.7.0

• Added: Reduce background-repeat definitions; works with both this property
  & the background shorthand, and aims to compress the extended two value
  syntax into the single value syntax.
• Added: Reduce initial values for properties when the actual initial value
  is shorter; for example, min-width: initial becomes min-width: 0.

3.6.2

• Fixed an issue where cssnano would crash on steps(1).

3.6.1

• Fixed an issue where cssnano would crash on steps functions with a
  single argument.

3.6.0

• Added postcss-discard-overridden to safely discard overridden rules with
  the same identifier (thanks to @Justineo).
• Added: Reduce animation/transition timing functions. Detects cubic-bezier
  functions that are equivalent to the timing keywords and compresses, as well
  as normalizing the steps timing function.
• Added the perspective-origin property to the list of supported properties
  transformed by the reduce-positions transform.

3.5.2

• Resolves an issue where the 3 or 4 value syntax for background-position
  were being incorrectly converted.

3.5.1

• Improves checking for background-position values in the background
  shorthand property.

3.5.0

• Adds a new optimisation path which can minimise keyword values for
  background-position and the background shorthand.
• Tweaks to performance in the core module, now performs less AST passes.
• Now compiled with Babel 6.

3.4.0

• Adds a new optimisation path which can minimise gradient parameters
  automatically.

3.3.2

• Fixes an issue where using options.safe threw an error when cssnano was
  not used as part of a PostCSS instance, but standalone (such as in modules
  like gulp-cssnano). cssnano now renames safe internally to isSafe.

3.3.1

• Unpins postcss-colormin from 2.1.2, as the 2.1.3 & 2.1.4 patches had
  optimization regressions that are now resolved in 2.1.5.

3.3.0

• Updated modules to use postcss-value-parser version 3 (thanks to @TrySound).
• Now converts between transform functions with postcss-reduce-transforms.
  e.g. translate3d(0, 0, 0) becomes translateZ(0).

3.2.0

• cssnano no longer converts outline: none to outline: 0, as there are
  some cases where the values are not equivalent (thanks to @TrySound).
• cssnano no longer converts for example 16px to 1pc by default. Length
  optimisations can be turned on via {convertValues: {length: true}}.
• Improved minimization of css functions (thanks to @TrySound).

3.1.0

• This release swaps postcss-single-charset for postcss-normalize-charset,
  which can detect encoding to determine whether a charset is necessary.
  Optionally, you can set the add option to true to prepend a UTF-8
  charset to the output automatically (thanks to @TrySound).
• A safe option was added, which disables more aggressive optimisations, as
  a convenient preset configuration (thanks to @TrySound).
• Added an option to convert from deg to turn & vice versa, & improved
  minification performance in functions (thanks to @TrySound).

3.0.3

• Fixes an issue where cssnano was removing spaces around forward slashes in
  string literals (thanks to @TrySound).

3.0.2

• Fixes an issue where cssnano was removing spaces around forward slashes in
  calc functions.

3.0.1

• Replaced css-list & balanced-match with postcss-value-parser, reducing the
  module's overall size (thanks to @TrySound).

3.0.0

• All cssnano plugins and cssnano itself have migrated to PostCSS 5.x. Please
  make sure that when using the 3.x releases that you use a 5.x compatible
  PostCSS runner.
• cssnano will now compress inline SVG through SVGO. Because of this change,
  interfacing with cssnano must now be done through an asynchronous API. The
  main process method has the same signature as a PostCSS processor instance.
• The old options such as merge & fonts that were deprecated in
  release 2.5.0 were removed. The new architecture allows you to specify any
  module name to disable it.
• postcss-minify-selectors' at-rule compression was extracted out into
  postcss-minify-params (thanks to @TrySound).
• Overall performance of the module has improved dramatically, thanks to work
  by @TrySound and input from the community.
• Improved selector merging/deduplication in certain use cases.
• cssnano no longer compresses hex colours in filter properties, to better
  support old versions of Internet Explorer (thanks to @faddee).
• cssnano will not merge properties together that have an inherit keyword.
• postcss-minify-font-weight & postcss-font-family were consolidated into
  postcss-minify-font-values. Using the old options will print deprecation
  warnings (thanks to @TrySound).
• The cssnano CLI was extracted into a separate module, so that dependent
  modules such as gulp-cssnano don't download unnecessary extras.

2.6.1

• Improved performance of the core module functionOptimiser.

2.6.0

• Adds a new optimisation which re-orders properties that accept values in
  an arbitrary order. This can lead to improved merging behaviour in certain
  cases.

2.5.0

• Adds support for disabling modules of the user's choosing, with new option
  names. The old options (such as merge & fonts) will be removed in 3.0.

2.4.0

• postcss-minify-selectors was extended to add support for conversion of
  ::before to :before; this release removes the dedicated
  postcss-pseudoelements module.

2.3.0

• Consolidated postcss-minify-trbl & two integrated modules into
  postcss-merge-longhand.

2.2.0

• Replaced integrated plugin filter with postcss-filter-plugins.
• Improved rule merging logic.
• Improved performance across the board by reducing AST iterations where it
  was possible to do so.
• cssnano will now perform better whitespace compression when used with other
  PostCSS plugins.

2.1.1

• Fixes an issue where options were not passed to normalize-url.

2.1.0

• Allow postcss-font-family to be disabled.

2.0.3

• cssnano can now be consumed with the parentheses-less method in PostCSS; e.g.
  postcss([ cssnano ]).
• Fixes an issue where 'Din' was being picked up by the logic as a numeric
  value, causing the full font name to be incorrectly rearranged.

2.0.2

• Extract trbl value reducing into a separate module.
• Refactor core longhand optimiser to not rely on trbl cache.
• Adds support for ch units; previously they were removed.
• Fixes parsing of some selector hacks.
• Fixes an issue where embedded base 64 data was being converted as if it were
  a URL.

2.0.1

• Add postcss-plugin keyword to package.json.
• Wraps all core processors with the PostCSS 4.1 plugin API.

2.0.0

• Adds removal of outdated vendor prefixes based on browser support.
• Addresses an issue where relative path separators were converted to
  backslashes on Windows.
• cssnano will now detect previous plugins and silently disable them when the
  functionality overlaps. This is to enable faster interoperation with cssnext.
• cssnano now exports as a PostCSS plugin. The simple interface is exposed
  at cssnano.process(css, opts) instead of cssnano(css, opts).
• Improved URL detection when using two or more in the same declaration.
• node 0.10 is no longer officially supported.

1.4.3

• Fixes incorrect minification of background:none to background:0 0.

1.4.2

• Fixes an issue with nested URLs inside url() functions.

1.4.1

• Addresses an issue where whitespace removal after a CSS function would cause
  rendering issues in Internet Explorer.

1.4.0

• Adds support for removal of unused @keyframes and @counter-style at-rules.
• comments: adds support for user-directed removal of comments, with the
  remove option (thanks to @dmitrykiselyov).
• comments: removeAllButFirst now operates on each CSS tree, rather than the
  first one passed to cssnano.

1.3.3

• Fixes incorrect minification of border:none to border:0 0.

1.3.2

• Improved selector minifying logic, leading to better compression of attribute
  selectors.
• Improved comment discarding logic.

1.3.1

• Fixes crash on undefined decl.before from prior AST.

1.3.0

• Added support for bundling cssnano using webpack (thanks to @MoOx).

1.2.1

• Fixed a bug where a CSS function keyword inside its value would throw
  an error.

1.2.0

• Better support for merging properties without the existance of a shorthand
  override.
• Can now 'merge forward' adjacent rules as well as the previous 'merge behind'
  behaviour, leading to better compression.
• Selector re-ordering now happens last in the chain of plugins, to help clean
  up merged selectors.

1.1.0

• Now can merge identifiers such as @keyframes and @counter-style if they
  have duplicated properties but are named differently.
• Fixes an issue where duplicated keyframes with the same name would cause
  an infinite loop.

1.0.2

• Improve module loading logic (thanks to @tunnckoCore).
• Improve minification of numeric values, with better support for rem,
  trailing zeroes and slash/comma separated values
  (thanks to @TrySound & @tunnckoCore).
• Fixed an issue where -webkit-tap-highlight-color values were being
  incorrectly transformed to transparent. This is not supported in Safari.
• Added support for viewport units (thanks to @TrySound).
• Add MIT license file.

1.0.1

• Add repository/author links to package.json.

1.0.0

• Initial release.