stylehacks does not throw error on [attr] selectorpostcss-colormin: increase performancepostcss-discard-comments: increase performancepostcss-merge-rules increase performancepostcss-minify-params increase performancepostcss-minify-selectors: increase performancepostcss-normalize-display-values: increase performance postcss-normalize-positions: increase performancepostcss-normalize-repeat-style: increase performancepostcss-normalize-string: increase performancepostcss-normalize-timing-functions: increase performancepostcss-normalize-whitespace: increase performancepostcss-ordered-values: increase performancepostcss-reduce-transforms: increase performancepostcss-svgo: increase performancepostcss-merge-longhand handle uppercase properties and valuespostcss-minify-gradients handle uppercase properties and valuespostcss-minify-params do break @page rulespostcss-reduce-idents handle uppercase at-rulespostcss-reduce-initial now uses repeat as initial value for mask-repeatpostcss-reduce-initial handle uppercase value when you convert to initialstylehacks handle uppercase properties and valuesrequire('cssnano')).postcss-merge-longhand correctly merging border properties with custom properties.cssnano due broken release.postcss-merge-longhand doesn't throw error when merge a border property.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.postcss-calc updated to 7.0.0 version.css-declaration-sorter now use PostCSS 7.postcss-calc now use PostCSS 7.postcss-minify-font-values now use PostCSS 7.postcss-discard-duplicates now use PostCSS 7.postcss-svgo now handle DataURI with uppercase data value (DATA:image/*;...).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.cssnano-preset-advanced use Autoprefixer 9.postcss-merge-longhand doesn't mangle borders.postcss-ordered-values support ordering animation values.postcss-merge-longhand now correctly merges borders with custom properties.postcss-merge-longhand doesn't throw error in some border merge cases.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.postcss-merge-longhand incorrect minification of border (border-*) declarations.postcss-merge-longhand don't explode declarations with custom properties.postcss-colormin now better transform to hsl.browserslist version incompatibility with caniuse-api.border-spacing property.U to lowercase for IE <= 11 and Edge <= 15.a { border-style:dotted; border-style:var(--variable) }) correctly.border property with invalid border width value correctly.:-ms-input-placeholder and ::-ms-input-placeholder selectors correctly.all property correctly.url function.data and *-extension:// URLs correctly.all for IE.@media \0screen\,screen\9 {} hacks
(thanks to @evilebottnawi).resolveConfig for a Root node without a source property
(thanks to @darthmaim).@value syntax from css-modules to better integrate with css-loader.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.
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:
autoprefixerpostcss-discard-unusedpostcss-merge-identspostcss-reduce-identspostcss-zindexNote 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).postcss-colormin will no
longer compress whitespace or compress numbers, as those are handled by
postcss-normalize-whitespace & postcss-convert-values respectively.clone behaviour. In cases where some utility
has been used by several plugins it is now a separate package, reducing
cssnano's footprint.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!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.grid identifier reduction by adding it to the list
of optimisations turned off when options.safe is set to true.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.v3.9.0, where undefined values
would attempt to be parsed.display: list-item inline flow would be normalized
to inline list-item rather than inline-list-item (thanks to @mattbasta).display property. For
example block flow can be simplified to block.safe flag was not being persisted across
multiple files (thanks to @techmatt101).hasOwnProperty instead of using an array of object keys.indexes-of dependency.2.0.0 as a fix has landed in the new
version of uniqid.2.0.0 in order to
mitigate an issue with uniqid 3.0.0.stripWWW option.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.initial values for properties when the actual initial value
is shorter; for example, min-width: initial becomes min-width: 0.steps(1).steps functions with a
single argument.postcss-discard-overridden to safely discard overridden rules with
the same identifier (thanks to @Justineo).cubic-bezier
functions that are equivalent to the timing keywords and compresses, as well
as normalizing the steps timing function.perspective-origin property to the list of supported properties
transformed by the reduce-positions transform.background-position
were being incorrectly converted.background-position values in the background
shorthand property.background-position and the background shorthand.core module, now performs less AST passes.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.2.1.2, as the 2.1.3 & 2.1.4 patches had
optimization regressions that are now resolved in 2.1.5.translate3d(0, 0, 0) becomes translateZ(0).outline: none to outline: 0, as there are
some cases where the values are not equivalent (thanks to @TrySound).16px to 1pc by default. Length
optimisations can be turned on via {convertValues: {length: true}}.add option to true to prepend a UTF-8
charset to the output automatically (thanks to @TrySound).safe option was added, which disables more aggressive optimisations, as
a convenient preset configuration (thanks to @TrySound).deg to turn & vice versa, & improved
minification performance in functions (thanks to @TrySound).process method has the same signature as a PostCSS processor instance.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.inherit keyword.functionOptimiser.merge & fonts) will be removed in 3.0.::before to :before; this release removes the dedicated
postcss-pseudoelements module.postcss-font-family to be disabled.postcss([ cssnano ]).ch units; previously they were removed.postcss-plugin keyword to package.json.cssnano.process(css, opts) instead of cssnano(css, opts).background:none to background:0 0.url() functions.@keyframes and @counter-style at-rules.remove option (thanks to @dmitrykiselyov).removeAllButFirst now operates on each CSS tree, rather than the
first one passed to cssnano.border:none to border:0 0.decl.before from prior AST.@keyframes and @counter-style if they
have duplicated properties but are named differently.rem,
trailing zeroes and slash/comma separated values
(thanks to @TrySound & @tunnckoCore).-webkit-tap-highlight-color values were being
incorrectly transformed to transparent. This is not supported in Safari.